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"8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b", "source_url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://pg.center/docs/12/tableam.html", "path": "tableam.html", "label": "PostgreSQL 12 English manual", "sha256": "4a2f5484c66207255d238dc6a312b1fecf991782c97cbe20e2522b8e33eaf341", "language": "en", "original_url": "/docs/12/tableam.html"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "line": 2659, "path": "src/backend/access/heap/heapam_handler.c", "label": "src/backend/access/heap/heapam_handler.c:2659", "sha256": "30b90707d75ec73d6b8aa8d939d372120d59e4e2cb470e77e51164af45b41138", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://pg.center/docs/12/mvcc-intro.html", "path": "mvcc-intro.html", "label": "PostgreSQL 12 English manual", "sha256": "519cbfd791ca57455e33efd709a1fc8ae8164a3fc3efef28613a95aeed398d8e", "language": "en", "original_url": "/docs/12/mvcc-intro.html"}, {"url": "https://pg.center/docs/12/sql-createtable.html", "path": "sql-createtable.html", "label": "PostgreSQL 12 English manual", "sha256": "7210cf3ff82ffa37ef81ebbbc252e4807649dcb86050eaa3ea5fcba40a768656", "language": "en", "original_url": "/docs/12/sql-createtable.html"}, {"url": "https://pg.center/docs/12/routine-vacuuming.html", "path": "routine-vacuuming.html", "label": "PostgreSQL 12 English manual", "sha256": "86a0c5de06e0271f0c1cc357c7060578b66260bf785fb78d02abd36afb5ea1f3", "language": "en", "original_url": "/docs/12/routine-vacuuming.html"}, {"url": "https://pg.center/docs/12/catalog-pg-am.html", "path": "catalog-pg-am.html", "label": "PostgreSQL 12 English manual", "sha256": "93b1cac9d6535f34e389d3ba8488f21d9c5a7812ffba495b3d838b58548b547a", "language": "en", "original_url": "/docs/12/catalog-pg-am.html"}], "sections": [{"title": "\u63a5\u53e3\u4e0e\u80fd\u529b\u8fb9\u754c", "paragraphs": ["\u77e9\u9635\u8bb0\u5f55\u6b64\u6e90\u7801\u6784\u5efa\u5b9e\u9645\u6ce8\u518c\u7684\u56de\u8c03\u3002\u6ce8\u518c\u8868\u660e\u5b9e\u73b0\u4e86\u76f8\u5e94\u63a5\u53e3\u94a9\u5b50\uff1b\u64cd\u4f5c\u662f\u5426\u5141\u8bb8\u8fd8\u53d6\u51b3\u4e8e\u9009\u9879\u3001\u67e5\u8be2\u5f62\u5f0f\u3001\u6743\u9650\u548c\u63d0\u4f9b\u65b9\u89c4\u5219\u3002", "\u4e0b\u65b9\u4fdd\u7559\u540c\u7248\u672c\u5b8c\u6574\u624b\u518c\uff0c\u5305\u62ec\u914d\u7f6e\u3001\u7ea6\u675f\u548c\u793a\u4f8b\u3002\u4e0d\u58f0\u79f0\u5df2\u8fdb\u884c\u8fd0\u884c\u65f6\u80fd\u529b\u6d4b\u8bd5\u3002"]}, {"title": "\u5806\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u4e0e WAL", "paragraphs": ["\u6b64\u6e05\u5355\u4ece PostgreSQL 12 \u5f15\u5165\u7684 Table AM \u63a5\u53e3\u5f00\u59cb\u3002\u4e0d\u4f1a\u5c06\u66f4\u65e9\u7248\u672c\u7684 PostgreSQL \u5806\u5b58\u50a8\u91cd\u65b0\u6807\u4e3a Table AM \u5b9e\u73b0\u3002", "\u5806\u53ef\u89c1\u6027\u9075\u5faa PostgreSQL \u5feb\u7167\u3002WAL \u548c\u5d29\u6e83\u6062\u590d\u884c\u4e3a\u53d6\u51b3\u4e8e\u5173\u7cfb\u7684\u6301\u4e45\u6027\uff1b\u4e34\u65f6\u8868\u3001\u65e0\u65e5\u5fd7\u8868\u4e0e\u6c38\u4e45\u8868\u4e0d\u540c\u3002\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u4e0e\u8868\u5b58\u50a8\u63a5\u53e3\u5206\u5f00\u3002"]}, {"code": "{\n\t.type = T_TableAmRoutine,\n\n\t.slot_callbacks = heapam_slot_callbacks,\n\n\t.scan_begin = heap_beginscan,\n\t.scan_end = heap_endscan,\n\t.scan_rescan = heap_rescan,\n\t.scan_getnextslot = heap_getnextslot,\n\n\t.parallelscan_estimate = table_block_parallelscan_estimate,\n\t.parallelscan_initialize = table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_fetch_begin = heapam_index_fetch_begin,\n\t.index_fetch_reset = heapam_index_fetch_reset,\n\t.index_fetch_end = heapam_index_fetch_end,\n\t.index_fetch_tuple = heapam_index_fetch_tuple,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\t.finish_bulk_insert = heapam_finish_bulk_insert,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.compute_xid_horizon_for_tuples = heap_compute_xid_horizon_for_tuples,\n\n\t.relation_set_new_filenode = heapam_relation_set_new_filenode,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = heapam_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_block = heapam_scan_bitmap_next_block,\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "heapam_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "finish_bulk_insert": "heapam_finish_bulk_insert", "relation_copy_data": "heapam_relation_copy_data", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_block": "heapam_scan_bitmap_next_block", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "relation_set_new_filenode": "heapam_relation_set_new_filenode", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "compute_xid_horizon_for_tuples": "heap_compute_xid_horizon_for_tuples", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
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\u7b2c 60 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

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\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\n

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\n

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heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.compute_xid_horizon_for_tuples = heap_compute_xid_horizon_for_tuples,\n\n\t.relation_set_new_filenode = heapam_relation_set_new_filenode,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_block = heapam_scan_bitmap_next_block,\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "relation_toast_am": "heapam_relation_toast_am", "relation_copy_data": "heapam_relation_copy_data", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_block": "heapam_scan_bitmap_next_block", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "relation_set_new_filenode": "heapam_relation_set_new_filenode", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "compute_xid_horizon_for_tuples": "heap_compute_xid_horizon_for_tuples", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
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\u7b2c 60 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

\n

\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

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\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a069.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

\n

\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 69.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

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\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u79cd\u65b0\u7684 WAL \u8bb0\u5f55\u7c7b\u578b\u3002\u901a\u7528 WAL \u8bb0\u5f55\u4f7f\u7528\u7b80\u5355\uff0c\u4f46\u610f\u5473\u7740\u66f4\u5927\u7684 WAL \u91cf\u3002\u76ee\u524d\u5b9e\u73b0\u65b0\u7684 WAL \u8bb0\u5f55\u7c7b\u578b\u9700\u8981\u4fee\u6539\u6838\u5fc3\u4ee3\u7801\uff08\u5177\u4f53\u6765\u8bf4\u662f src/include/access/rmgrlist.h\uff09\u3002

\n

\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

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\u5f00\u53d1\u65b0\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u53c2\u7167 src/backend/access/heap/heapam_handler.c \u4e2d\u73b0\u6709\u7684\u5806\u5b9e\u73b0\uff0c\u4e86\u89e3\u5b9e\u73b0\u7ec6\u8282\u3002

\n
", "manual_path": "/docs/13/tableam.html", "localization": {"status": "complete", "sources": [{"url": "/docs/13/tableam.html", "method": "same-major semantic node", "sha256": "203fa0468aabf50c378c2bf7d73ee58a72fd30323287bd864e40350f47267fb0", "language": "zh", "matched_nodes": ["#TABLEAM/p[10]", "#TABLEAM/p[3]", "#TABLEAM/p[4]", "#TABLEAM/p[5]", "#TABLEAM/p[7]", "#TABLEAM/p[9]"]}], "language": "zh", "original_text": {"/versions/13/description/0": "The built-in heap table access method integrates tuple storage, visibility, scans, index fetches and maintenance with PostgreSQL.", "/versions/13/facts/0/label": "Interface family", "/versions/13/facts/0/value": "Table access method", "/versions/13/facts/1/label": "Handler or routine", "/versions/13/facts/2/label": "Recorded callbacks", "/versions/13/tables/0/title": "Registered interface handlers", "/versions/13/related/0/label": "System catalog pg_am", "/versions/13/related/2/label": "Index AM", "/versions/13/sections/0/title": "Interface and capability boundaries", "/versions/13/sections/1/title": "Heap storage, visibility and WAL", "/versions/13/sections/2/title": "Registered implementation in core source", "/versions/13/tables/0/rows/0/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/1/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/2/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/3/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/4/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/5/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/6/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/7/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/8/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/9/state": "Handler registered; conditions apply", "/versions/13/tables/0/rows/10/state": "Handler registered; conditions apply", "/versions/13/sections/0/paragraphs/0": "The matrix records callbacks actually registered in this source build. Registration identifies an implemented interface hook; options, query shape, privileges and provider rules determine whether an operation is allowed.", "/versions/13/sections/0/paragraphs/1": "The complete same-version manual below retains configuration, constraints and examples. No runtime capability test is claimed.", "/versions/13/sections/1/paragraphs/0": "This inventory starts with the Table AM interface in PostgreSQL 12. Earlier PostgreSQL heap storage is not relabeled as a Table AM implementation.", "/versions/13/sections/1/paragraphs/1": "Heap visibility follows PostgreSQL snapshots. WAL and crash-recovery behavior depend on relation persistence; temporary and unlogged tables differ from permanent tables. Index access methods remain separate from the table storage interface.", "/versions/13/tables/0/rows/0/feature": "Tuple slot", "/versions/13/tables/0/rows/1/feature": "Begin scan", "/versions/13/tables/0/rows/2/feature": "Parallel scan initialization", "/versions/13/tables/0/rows/3/feature": "Begin index lookup", "/versions/13/tables/0/rows/4/feature": "Fetch identified tuple", "/versions/13/tables/0/rows/5/feature": "Insert tuple", "/versions/13/tables/0/rows/6/feature": "Update tuple", "/versions/13/tables/0/rows/7/feature": "Delete tuple", "/versions/13/tables/0/rows/8/feature": "Vacuum relation", "/versions/13/tables/0/rows/9/feature": "Analyze block", "/versions/13/tables/0/columns/0/label": "Interface operation", "/versions/13/tables/0/columns/1/label": "Source observation", "/versions/13/tables/0/columns/2/label": "Callback", "/versions/13/tables/0/columns/3/label": "Implementation", "/versions/13/tables/0/rows/10/feature": "TOAST decision"}, "fallback_fields": [], 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\u7b2c 61 \u7ae0. Table Access Method Interface Definition

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\n

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\n

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\n

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\n

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\n

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\n

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\n
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"afaeb26977cb9fa6503500d6eff1bc108f5ac76cc80185345bcde2b8e39c9c93", "language": "en", "original_url": "/docs/15/catalog-pg-am.html"}], "sections": [{"title": "\u63a5\u53e3\u4e0e\u80fd\u529b\u8fb9\u754c", "paragraphs": ["\u77e9\u9635\u8bb0\u5f55\u6b64\u6e90\u7801\u6784\u5efa\u5b9e\u9645\u6ce8\u518c\u7684\u56de\u8c03\u3002\u6ce8\u518c\u8868\u660e\u5b9e\u73b0\u4e86\u76f8\u5e94\u63a5\u53e3\u94a9\u5b50\uff1b\u64cd\u4f5c\u662f\u5426\u5141\u8bb8\u8fd8\u53d6\u51b3\u4e8e\u9009\u9879\u3001\u67e5\u8be2\u5f62\u5f0f\u3001\u6743\u9650\u548c\u63d0\u4f9b\u65b9\u89c4\u5219\u3002", "\u4e0b\u65b9\u4fdd\u7559\u540c\u7248\u672c\u5b8c\u6574\u624b\u518c\uff0c\u5305\u62ec\u914d\u7f6e\u3001\u7ea6\u675f\u548c\u793a\u4f8b\u3002\u4e0d\u58f0\u79f0\u5df2\u8fdb\u884c\u8fd0\u884c\u65f6\u80fd\u529b\u6d4b\u8bd5\u3002"]}, {"title": "\u5806\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u4e0e WAL", "paragraphs": ["\u6b64\u6e05\u5355\u4ece PostgreSQL 12 \u5f15\u5165\u7684 Table AM \u63a5\u53e3\u5f00\u59cb\u3002\u4e0d\u4f1a\u5c06\u66f4\u65e9\u7248\u672c\u7684 PostgreSQL \u5806\u5b58\u50a8\u91cd\u65b0\u6807\u4e3a Table AM \u5b9e\u73b0\u3002", "\u5806\u53ef\u89c1\u6027\u9075\u5faa PostgreSQL \u5feb\u7167\u3002WAL \u548c\u5d29\u6e83\u6062\u590d\u884c\u4e3a\u53d6\u51b3\u4e8e\u5173\u7cfb\u7684\u6301\u4e45\u6027\uff1b\u4e34\u65f6\u8868\u3001\u65e0\u65e5\u5fd7\u8868\u4e0e\u6c38\u4e45\u8868\u4e0d\u540c\u3002\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u4e0e\u8868\u5b58\u50a8\u63a5\u53e3\u5206\u5f00\u3002"]}, {"code": "{\n\t.type = T_TableAmRoutine,\n\n\t.slot_callbacks = heapam_slot_callbacks,\n\n\t.scan_begin = heap_beginscan,\n\t.scan_end = heap_endscan,\n\t.scan_rescan = heap_rescan,\n\t.scan_getnextslot = heap_getnextslot,\n\n\t.scan_set_tidrange = heap_set_tidrange,\n\t.scan_getnextslot_tidrange = heap_getnextslot_tidrange,\n\n\t.parallelscan_estimate = table_block_parallelscan_estimate,\n\t.parallelscan_initialize = table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_fetch_begin = heapam_index_fetch_begin,\n\t.index_fetch_reset = heapam_index_fetch_reset,\n\t.index_fetch_end = heapam_index_fetch_end,\n\t.index_fetch_tuple = heapam_index_fetch_tuple,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.index_delete_tuples = heap_index_delete_tuples,\n\n\t.relation_set_new_filenode = heapam_relation_set_new_filenode,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_block = heapam_scan_bitmap_next_block,\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "relation_toast_am": "heapam_relation_toast_am", "scan_set_tidrange": "heap_set_tidrange", "relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_block": "heapam_scan_bitmap_next_block", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "relation_set_new_filenode": "heapam_relation_set_new_filenode", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
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\u7b2c 63 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

\n

\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

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\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a073.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 73.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

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\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49 WAL \u8d44\u6e90\u7ba1\u7406\u5668\u3002

\n

\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

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\n
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\u7b2c 63 \u7ae0. Table Access Method Interface Definition

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\n

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\n

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\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a073.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

\n

\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 73.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

\n

\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49 WAL \u8d44\u6e90\u7ba1\u7406\u5668\u3002

\n

\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

\n

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\n
", "manual_path": "/docs/16/tableam.html", "localization": {"status": "complete", "sources": [{"url": "/docs/16/tableam.html", "method": "same-major semantic node", "sha256": "00d4d7ce2a226005787acdea4183d3b8d54bbe9d468e19070e2e9d121f4eac4b", "language": "zh", "matched_nodes": ["#TABLEAM/p[10]", "#TABLEAM/p[3]", "#TABLEAM/p[4]", "#TABLEAM/p[5]", "#TABLEAM/p[7]", "#TABLEAM/p[9]"]}], "language": "zh", "original_text": {"/versions/16/description/0": "The built-in heap table access method integrates tuple storage, visibility, scans, index fetches and maintenance with PostgreSQL.", "/versions/16/facts/0/label": "Interface family", "/versions/16/facts/0/value": "Table access method", "/versions/16/facts/1/label": "Handler or routine", "/versions/16/facts/2/label": "Recorded callbacks", "/versions/16/tables/0/title": "Registered interface handlers", "/versions/16/related/0/label": "System catalog pg_am", "/versions/16/related/2/label": "Index AM", "/versions/16/sections/0/title": "Interface and capability boundaries", "/versions/16/sections/1/title": "Heap storage, visibility and WAL", "/versions/16/sections/2/title": "Registered implementation in core source", "/versions/16/tables/0/rows/0/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/1/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/2/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/3/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/4/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/5/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/6/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/7/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/8/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/9/state": "Handler registered; conditions apply", "/versions/16/tables/0/rows/10/state": "Handler registered; conditions apply", "/versions/16/sections/0/paragraphs/0": "The matrix records callbacks actually registered in this source build. 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"dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://pg.center/docs/17/mvcc-intro.html", "path": "mvcc-intro.html", "label": "PostgreSQL 17 English manual", "sha256": "0ccd499b03dc7f8e803e7682cff147929ae032ff893dcf4b36e66a4480ef0b9a", "language": "en", "original_url": "/docs/17/mvcc-intro.html"}, {"url": "https://pg.center/docs/17/sql-createtable.html", "path": "sql-createtable.html", "label": "PostgreSQL 17 English manual", "sha256": "97385c16a0ff155ad89fe616bb074bf0a8328bcb21f5e64a7a6a0a03ddb1f4ef", "language": "en", "original_url": "/docs/17/sql-createtable.html"}, {"url": "https://pg.center/docs/17/routine-vacuuming.html", "path": "routine-vacuuming.html", "label": "PostgreSQL 17 English manual", "sha256": "2f7caa1e26c93613937e7a6f422db31839f7aae55ee5c97f7b8807ff6b544e38", "language": "en", "original_url": "/docs/17/routine-vacuuming.html"}, {"url": "https://pg.center/docs/17/catalog-pg-am.html", "path": "catalog-pg-am.html", "label": "PostgreSQL 17 English manual", "sha256": "919e02926ce8d5b206bb575cb8a1c5f60b2eee3d06cd375c0891fc779802b798", "language": "en", "original_url": "/docs/17/catalog-pg-am.html"}], "sections": [{"title": "\u63a5\u53e3\u4e0e\u80fd\u529b\u8fb9\u754c", "paragraphs": ["\u77e9\u9635\u8bb0\u5f55\u6b64\u6e90\u7801\u6784\u5efa\u5b9e\u9645\u6ce8\u518c\u7684\u56de\u8c03\u3002\u6ce8\u518c\u8868\u660e\u5b9e\u73b0\u4e86\u76f8\u5e94\u63a5\u53e3\u94a9\u5b50\uff1b\u64cd\u4f5c\u662f\u5426\u5141\u8bb8\u8fd8\u53d6\u51b3\u4e8e\u9009\u9879\u3001\u67e5\u8be2\u5f62\u5f0f\u3001\u6743\u9650\u548c\u63d0\u4f9b\u65b9\u89c4\u5219\u3002", "\u4e0b\u65b9\u4fdd\u7559\u540c\u7248\u672c\u5b8c\u6574\u624b\u518c\uff0c\u5305\u62ec\u914d\u7f6e\u3001\u7ea6\u675f\u548c\u793a\u4f8b\u3002\u4e0d\u58f0\u79f0\u5df2\u8fdb\u884c\u8fd0\u884c\u65f6\u80fd\u529b\u6d4b\u8bd5\u3002"]}, {"title": "\u5806\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u4e0e WAL", "paragraphs": ["\u6b64\u6e05\u5355\u4ece PostgreSQL 12 \u5f15\u5165\u7684 Table AM \u63a5\u53e3\u5f00\u59cb\u3002\u4e0d\u4f1a\u5c06\u66f4\u65e9\u7248\u672c\u7684 PostgreSQL \u5806\u5b58\u50a8\u91cd\u65b0\u6807\u4e3a Table AM \u5b9e\u73b0\u3002", "\u5806\u53ef\u89c1\u6027\u9075\u5faa PostgreSQL \u5feb\u7167\u3002WAL \u548c\u5d29\u6e83\u6062\u590d\u884c\u4e3a\u53d6\u51b3\u4e8e\u5173\u7cfb\u7684\u6301\u4e45\u6027\uff1b\u4e34\u65f6\u8868\u3001\u65e0\u65e5\u5fd7\u8868\u4e0e\u6c38\u4e45\u8868\u4e0d\u540c\u3002\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u4e0e\u8868\u5b58\u50a8\u63a5\u53e3\u5206\u5f00\u3002"]}, {"code": "{\n\t.type = T_TableAmRoutine,\n\n\t.slot_callbacks = heapam_slot_callbacks,\n\n\t.scan_begin = heap_beginscan,\n\t.scan_end = heap_endscan,\n\t.scan_rescan = heap_rescan,\n\t.scan_getnextslot = heap_getnextslot,\n\n\t.scan_set_tidrange = heap_set_tidrange,\n\t.scan_getnextslot_tidrange = heap_getnextslot_tidrange,\n\n\t.parallelscan_estimate = table_block_parallelscan_estimate,\n\t.parallelscan_initialize = table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_fetch_begin = heapam_index_fetch_begin,\n\t.index_fetch_reset = heapam_index_fetch_reset,\n\t.index_fetch_end = heapam_index_fetch_end,\n\t.index_fetch_tuple = heapam_index_fetch_tuple,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.index_delete_tuples = heap_index_delete_tuples,\n\n\t.relation_set_new_filelocator = heapam_relation_set_new_filelocator,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_block = heapam_scan_bitmap_next_block,\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "relation_toast_am": "heapam_relation_toast_am", "scan_set_tidrange": "heap_set_tidrange", "relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_block": "heapam_scan_bitmap_next_block", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_set_new_filelocator": "heapam_relation_set_new_filelocator", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
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\u7b2c 61 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

\n

\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a065.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 65.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

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\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49 WAL \u8d44\u6e90\u7ba1\u7406\u5668\u3002

\n

\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

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\u7b2c 62 \u7ae0. Table Access Method Interface Definition

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\n

\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

\n

\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002

\n

\u4e0b\u9762\u5c55\u793a\u6269\u5c55 SQL \u811a\u672c\u6587\u4ef6\u5982\u4f55\u521b\u5efa\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\uff1a

\n
CREATE OR REPLACE FUNCTION my_tableam_handler(internal)\n  RETURNS table_am_handler AS 'my_extension', 'my_tableam_handler'\n  LANGUAGE C STRICT;\n\nCREATE ACCESS METHOD myam TYPE TABLE HANDLER my_tableam_handler;\n
\n

\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002

\n

\u4e0b\u9762\u662f\u4e00\u4e2a\u5305\u542b\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\u7684\u6e90\u6587\u4ef6\u793a\u4f8b\uff1a

\n
#include \"postgres.h\"\n\n#include \"access/tableam.h\"\n#include \"fmgr.h\"\n\nPG_MODULE_MAGIC;\n\nstatic const TableAmRoutine my_tableam_methods = {\n    .type = T_TableAmRoutine,\n\n    /* Methods of TableAmRoutine omitted from example, add them here. */\n};\n\nPG_FUNCTION_INFO_V1(my_tableam_handler);\n\nDatum\nmy_tableam_handler(PG_FUNCTION_ARGS)\n{\n    PG_RETURN_POINTER(&my_tableam_methods);\n}\n\n
\n

TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

\n

\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a066.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

\n

\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 66.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

\n

\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49 WAL \u8d44\u6e90\u7ba1\u7406\u5668\u3002

\n

\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

\n

\u5f00\u53d1\u65b0\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u53c2\u7167 src/backend/access/heap/heapam_handler.c \u4e2d\u73b0\u6709\u7684\u5806\u5b9e\u73b0\uff0c\u4e86\u89e3\u5b9e\u73b0\u7ec6\u8282\u3002

\n
", "manual_path": "/docs/18/tableam.html", "localization": {"status": "complete", "sources": [{"url": "/docs/18/tableam.html", "method": "same-major semantic node", "sha256": "29a69a32b5b468f79af513ef4e398bccc182443109d9f3da23f374e018b981e6", "language": "zh", "matched_nodes": ["#TABLEAM/p[11]", "#TABLEAM/p[13]", "#TABLEAM/p[15]", "#TABLEAM/p[16]", "#TABLEAM/p[3]", "#TABLEAM/p[4]", "#TABLEAM/p[5]", "#TABLEAM/p[6]", "#TABLEAM/p[8]", "#TABLEAM/p[9]"]}], "language": "zh", "original_text": {"/versions/18/description/0": "The built-in heap table access method integrates tuple storage, visibility, scans, index fetches and maintenance with PostgreSQL.", "/versions/18/facts/0/label": "Interface family", "/versions/18/facts/0/value": "Table access method", "/versions/18/facts/1/label": "Handler or routine", "/versions/18/facts/2/label": "Recorded callbacks", "/versions/18/tables/0/title": "Registered interface handlers", "/versions/18/related/0/label": "System catalog pg_am", "/versions/18/related/2/label": "Index AM", "/versions/18/sections/0/title": "Interface and capability boundaries", "/versions/18/sections/1/title": "Heap storage, visibility and WAL", "/versions/18/sections/2/title": "Registered implementation in core source", "/versions/18/tables/0/rows/0/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/1/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/2/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/3/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/4/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/5/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/6/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/7/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/8/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/9/state": "Handler registered; conditions apply", "/versions/18/tables/0/rows/10/state": "Handler registered; conditions apply", "/versions/18/sections/0/paragraphs/0": "The matrix records callbacks actually registered in this source build. Registration identifies an implemented interface hook; options, query shape, privileges and provider rules determine whether an operation is allowed.", "/versions/18/sections/0/paragraphs/1": "The complete same-version manual below retains configuration, constraints and examples. No runtime capability test is claimed.", "/versions/18/sections/1/paragraphs/0": "This inventory starts with the Table AM interface in PostgreSQL 12. Earlier PostgreSQL heap storage is not relabeled as a Table AM implementation.", "/versions/18/sections/1/paragraphs/1": "Heap visibility follows PostgreSQL snapshots. WAL and crash-recovery behavior depend on relation persistence; temporary and unlogged tables differ from permanent tables. Index access methods remain separate from the table storage interface.", "/versions/18/tables/0/rows/0/feature": "Tuple slot", "/versions/18/tables/0/rows/1/feature": "Begin scan", "/versions/18/tables/0/rows/2/feature": "Parallel scan initialization", "/versions/18/tables/0/rows/3/feature": "Begin index lookup", "/versions/18/tables/0/rows/4/feature": "Fetch identified tuple", "/versions/18/tables/0/rows/5/feature": "Insert tuple", "/versions/18/tables/0/rows/6/feature": "Update tuple", "/versions/18/tables/0/rows/7/feature": "Delete tuple", "/versions/18/tables/0/rows/8/feature": "Vacuum relation", "/versions/18/tables/0/rows/9/feature": "Analyze block", "/versions/18/tables/0/columns/0/label": "Interface operation", "/versions/18/tables/0/columns/1/label": "Source observation", "/versions/18/tables/0/columns/2/label": "Callback", "/versions/18/tables/0/columns/3/label": "Implementation", "/versions/18/tables/0/rows/10/feature": "TOAST decision"}, "fallback_fields": [], 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"relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_set_new_filelocator": "heapam_relation_set_new_filelocator", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "source_options": [], "protocol_versions": {}}, "comparison_hash": "1238506f6e6c6648382f3362465d376e28e55ca6108f975b44f413d320769112", "manual_language": "zh", "runtime_verified": false}, "19": {"facts": [{"label": "\u63a5\u53e3\u7c7b\u522b", "value": "\u8868\u8bbf\u95ee\u65b9\u6cd5"}, {"label": "\u5904\u7406\u51fd\u6570\u6216\u4f8b\u7a0b", "value": "heapam_methods"}, {"label": "\u8bb0\u5f55\u7684\u56de\u8c03", "value": "43"}], "tables": [{"key": "callbacks", "rows": [{"state": 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"\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "PostgreSQL 19beta4 source archive", "label": "19beta4", "major": "19", "channel": "preview", "revision": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86", "source_url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://pg.center/docs/19/tableam.html", "path": "tableam.html", "label": "PostgreSQL 19 English manual", "sha256": "0dd4fc5fe12574339fd83f5a157add6d2bfcaa3a356e9b89fd1156c88e9814ce", "language": "en", "original_url": "/docs/19/tableam.html"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 2657, "path": "src/backend/access/heap/heapam_handler.c", "label": "src/backend/access/heap/heapam_handler.c:2657", "sha256": "a4090217097bf16b0eedc5b0448092d640aa259a9ea9ab69caf582f910f9e911", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://pg.center/docs/19/mvcc-intro.html", "path": "mvcc-intro.html", "label": "PostgreSQL 19 English manual", "sha256": "edcdc2d76d4d3607abb61e52b63d43af97d3141beb5b050b4fed1e2e829846b0", "language": "en", "original_url": "/docs/19/mvcc-intro.html"}, {"url": "https://pg.center/docs/19/sql-createtable.html", "path": "sql-createtable.html", "label": "PostgreSQL 19 English manual", "sha256": "75f290d105bd0e76c798f124b1eed4ad1e871c8a1d36c35f0db9d38fbb7209f8", "language": "en", "original_url": "/docs/19/sql-createtable.html"}, {"url": "https://pg.center/docs/19/routine-vacuuming.html", "path": "routine-vacuuming.html", "label": "PostgreSQL 19 English manual", "sha256": "11c034fb2035ad09a989c38a4bba17efd989a1e6856a234f0e56bd947b1c7372", "language": "en", "original_url": "/docs/19/routine-vacuuming.html"}, {"url": "https://pg.center/docs/19/catalog-pg-am.html", "path": "catalog-pg-am.html", "label": "PostgreSQL 19 English manual", "sha256": "e3e87f797a302a2761b57510dbf48acc68ec635c8f538047c78ead25c2fba9aa", "language": "en", "original_url": "/docs/19/catalog-pg-am.html"}], "sections": [{"title": "\u63a5\u53e3\u4e0e\u80fd\u529b\u8fb9\u754c", "paragraphs": ["\u77e9\u9635\u8bb0\u5f55\u6b64\u6e90\u7801\u6784\u5efa\u5b9e\u9645\u6ce8\u518c\u7684\u56de\u8c03\u3002\u6ce8\u518c\u8868\u660e\u5b9e\u73b0\u4e86\u76f8\u5e94\u63a5\u53e3\u94a9\u5b50\uff1b\u64cd\u4f5c\u662f\u5426\u5141\u8bb8\u8fd8\u53d6\u51b3\u4e8e\u9009\u9879\u3001\u67e5\u8be2\u5f62\u5f0f\u3001\u6743\u9650\u548c\u63d0\u4f9b\u65b9\u89c4\u5219\u3002", "\u4e0b\u65b9\u4fdd\u7559\u540c\u7248\u672c\u5b8c\u6574\u624b\u518c\uff0c\u5305\u62ec\u914d\u7f6e\u3001\u7ea6\u675f\u548c\u793a\u4f8b\u3002\u4e0d\u58f0\u79f0\u5df2\u8fdb\u884c\u8fd0\u884c\u65f6\u80fd\u529b\u6d4b\u8bd5\u3002"]}, {"title": "\u5806\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u4e0e WAL", "paragraphs": ["\u6b64\u6e05\u5355\u4ece PostgreSQL 12 \u5f15\u5165\u7684 Table AM \u63a5\u53e3\u5f00\u59cb\u3002\u4e0d\u4f1a\u5c06\u66f4\u65e9\u7248\u672c\u7684 PostgreSQL \u5806\u5b58\u50a8\u91cd\u65b0\u6807\u4e3a Table AM \u5b9e\u73b0\u3002", "\u5806\u53ef\u89c1\u6027\u9075\u5faa PostgreSQL \u5feb\u7167\u3002WAL \u548c\u5d29\u6e83\u6062\u590d\u884c\u4e3a\u53d6\u51b3\u4e8e\u5173\u7cfb\u7684\u6301\u4e45\u6027\uff1b\u4e34\u65f6\u8868\u3001\u65e0\u65e5\u5fd7\u8868\u4e0e\u6c38\u4e45\u8868\u4e0d\u540c\u3002\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u4e0e\u8868\u5b58\u50a8\u63a5\u53e3\u5206\u5f00\u3002"]}, {"code": "{\n\t.type = T_TableAmRoutine,\n\n\t.slot_callbacks = heapam_slot_callbacks,\n\n\t.scan_begin = heap_beginscan,\n\t.scan_end = heap_endscan,\n\t.scan_rescan = heap_rescan,\n\t.scan_getnextslot = heap_getnextslot,\n\n\t.scan_set_tidrange = heap_set_tidrange,\n\t.scan_getnextslot_tidrange = heap_getnextslot_tidrange,\n\n\t.parallelscan_estimate = table_block_parallelscan_estimate,\n\t.parallelscan_initialize = table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_fetch_begin = heapam_index_fetch_begin,\n\t.index_fetch_reset = heapam_index_fetch_reset,\n\t.index_fetch_end = heapam_index_fetch_end,\n\t.index_fetch_tuple = heapam_index_fetch_tuple,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.index_delete_tuples = heap_index_delete_tuples,\n\n\t.relation_set_new_filelocator = heapam_relation_set_new_filelocator,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "relation_toast_am": "heapam_relation_toast_am", "scan_set_tidrange": "heap_set_tidrange", "relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_set_new_filelocator": "heapam_relation_set_new_filelocator", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
\n
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\n

\u7b2c 62 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

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\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002

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\u4e0b\u9762\u5c55\u793a\u6269\u5c55 SQL \u811a\u672c\u6587\u4ef6\u5982\u4f55\u521b\u5efa\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\uff1a

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CREATE OR REPLACE FUNCTION my_tableam_handler(internal)\n  RETURNS table_am_handler AS 'my_extension', 'my_tableam_handler'\n  LANGUAGE C STRICT;\n\nCREATE ACCESS METHOD myam TYPE TABLE HANDLER my_tableam_handler;\n
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\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002

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\u4e0b\u9762\u662f\u4e00\u4e2a\u5305\u542b\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\u7684\u6e90\u6587\u4ef6\u793a\u4f8b\uff1a

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#include \"postgres.h\"\n\n#include \"access/tableam.h\"\n#include \"fmgr.h\"\n\nPG_MODULE_MAGIC;\n\nstatic const TableAmRoutine my_tableam_methods = {\n    .type = T_TableAmRoutine,\n\n    /* Methods of TableAmRoutine omitted from example, add them here. */\n};\n\nPG_FUNCTION_INFO_V1(my_tableam_handler);\n\nDatum\nmy_tableam_handler(PG_FUNCTION_ARGS)\n{\n    PG_RETURN_POINTER(&my_tableam_methods);\n}\n\n
\n

TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a066.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

\n

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\n

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table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_scan_begin = heapam_index_scan_begin,\n\t.index_scan_reset = heapam_index_scan_reset,\n\t.index_scan_end = heapam_index_scan_end,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.fetch_tid = heapam_fetch_tid,\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.index_delete_tuples = heap_index_delete_tuples,\n\n\t.relation_set_new_filelocator = heapam_relation_set_new_filelocator,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "fetch_tid": "heapam_fetch_tid", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "index_scan_end": "heapam_index_scan_end", "slot_callbacks": "heapam_slot_callbacks", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "index_scan_begin": "heapam_index_scan_begin", "index_scan_reset": "heapam_index_scan_reset", "scan_getnextslot": "heap_getnextslot", "relation_toast_am": "heapam_relation_toast_am", "scan_set_tidrange": "heap_set_tidrange", "relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_set_new_filelocator": "heapam_relation_set_new_filelocator", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
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\u7b2c 62 \u7ae0. Table Access Method Interface Definition

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\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

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\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002

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\u4e0b\u9762\u5c55\u793a\u6269\u5c55 SQL \u811a\u672c\u6587\u4ef6\u5982\u4f55\u521b\u5efa\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\uff1a

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CREATE OR REPLACE FUNCTION my_tableam_handler(internal)\n  RETURNS table_am_handler AS 'my_extension', 'my_tableam_handler'\n  LANGUAGE C STRICT;\n\nCREATE ACCESS METHOD myam TYPE TABLE HANDLER my_tableam_handler;\n
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\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002

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\u4e0b\u9762\u662f\u4e00\u4e2a\u5305\u542b\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\u7684\u6e90\u6587\u4ef6\u793a\u4f8b\uff1a

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#include \"postgres.h\"\n\n#include \"access/tableam.h\"\n#include \"fmgr.h\"\n\nPG_MODULE_MAGIC;\n\nstatic const TableAmRoutine my_tableam_methods = {\n    .type = T_TableAmRoutine,\n\n    /* Methods of TableAmRoutine omitted from example, add them here. */\n};\n\nPG_FUNCTION_INFO_V1(my_tableam_handler);\n\nDatum\nmy_tableam_handler(PG_FUNCTION_ARGS)\n{\n    PG_RETURN_POINTER(&my_tableam_methods);\n}\n\n
\n

TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a066.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5 API \u76ee\u524d\u7684\u4e00\u9879\u8f83\u5927\u9650\u5236\u662f\uff1a\u82e5\u8bbf\u95ee\u65b9\u6cd5\u5e0c\u671b\u652f\u6301\u4fee\u6539\u64cd\u4f5c\u548c/\u6216\u7d22\u5f15\uff0c\u6bcf\u4e2a\u5143\u7ec4\u5fc5\u987b\u6709\u4e00\u4e2a\u7531\u5757\u53f7\u548c\u9879\u53f7\u7ec4\u6210\u7684\u5143\u7ec4\u6807\u8bc6\u7b26 TID\uff08\u53e6\u89c1\u7b2c 66.6 \u8282\uff09\u3002TID \u5404\u90e8\u5206\u4e0d\u5fc5\u5177\u6709\u4e0e heap \u4e2d\u5b8c\u5168\u76f8\u540c\u7684\u542b\u4e49\uff1b\u4f46\u5982\u679c\u8981\u652f\u6301\u53ef\u9009\u7684\u4f4d\u56fe\u626b\u63cf\uff0c\u5757\u53f7\u5c31\u9700\u8981\u63d0\u4f9b\u5c40\u90e8\u6027\u3002

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\u4e3a\u4fdd\u8bc1\u5d29\u6e83\u5b89\u5168\uff0cAM \u53ef\u4ee5\u4f7f\u7528 postgres \u7684WAL\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002\u5982\u679c\u9009\u62e9\u4e86 WAL\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u7528 WAL \u8bb0\u5f55\uff0c\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5b9a\u4e49 WAL \u8d44\u6e90\u7ba1\u7406\u5668\u3002

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\u8981\u4ee5\u5141\u8bb8\u5728\u5355\u4e2a\u4e8b\u52a1\u4e2d\u8bbf\u95ee\u4e0d\u540c\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u65b9\u5f0f\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\uff0c\u5f88\u53ef\u80fd\u9700\u8981\u4e0e src/backend/access/transam/xlog.c \u4e2d\u7684\u673a\u5236\u7d27\u5bc6\u96c6\u6210\u3002

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\u5f00\u53d1\u65b0\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u53c2\u7167 src/backend/access/heap/heapam_handler.c \u4e2d\u73b0\u6709\u7684\u5806\u5b9e\u73b0\uff0c\u4e86\u89e3\u5b9e\u73b0\u7ec6\u8282\u3002

\n
", "manual_path": "/docs/devel/tableam.html", "localization": {"status": "complete", "sources": [{"url": "/docs/devel/tableam.html", "method": "same-major semantic node", "sha256": "9a8d65b3ad58687f074f2f6307971ef7aa9443bd56a99be289ea41806362435c", "language": "zh", "matched_nodes": ["#TABLEAM/p[11]", "#TABLEAM/p[13]", "#TABLEAM/p[15]", "#TABLEAM/p[16]", "#TABLEAM/p[3]", "#TABLEAM/p[4]", "#TABLEAM/p[5]", "#TABLEAM/p[6]", "#TABLEAM/p[8]", "#TABLEAM/p[9]"]}], "language": "zh", "original_text": {"/summary": "The built-in heap table access method integrates tuple storage, visibility, scans, index fetches and maintenance with PostgreSQL.", "/category": "Core table AM", "/versions/20/description/0": "The built-in heap table access method integrates tuple storage, visibility, scans, index fetches and maintenance with PostgreSQL.", "/versions/20/facts/0/label": "Interface family", "/versions/20/facts/0/value": "Table access method", "/versions/20/facts/1/label": "Handler or routine", "/versions/20/facts/2/label": "Recorded callbacks", "/versions/20/tables/0/title": "Registered interface handlers", "/versions/20/related/0/label": "System catalog pg_am", "/versions/20/related/2/label": "Index AM", "/versions/20/sections/0/title": "Interface and capability boundaries", "/versions/20/sections/1/title": "Heap storage, visibility and WAL", "/versions/20/sections/2/title": "Registered implementation in core source", "/versions/20/tables/0/rows/0/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/1/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/2/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/3/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/4/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/5/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/6/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/7/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/8/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/9/state": "Handler registered; conditions apply", "/versions/20/tables/0/rows/10/state": "Handler registered; conditions apply", "/versions/20/sections/0/paragraphs/0": "The matrix records callbacks actually registered in this source build. Registration identifies an implemented interface hook; options, query shape, privileges and provider rules determine whether an operation is allowed.", "/versions/20/sections/0/paragraphs/1": "The complete same-version manual below retains configuration, constraints and examples. No runtime capability test is claimed.", "/versions/20/sections/1/paragraphs/0": "This inventory starts with the Table AM interface in PostgreSQL 12. Earlier PostgreSQL heap storage is not relabeled as a Table AM implementation.", "/versions/20/sections/1/paragraphs/1": "Heap visibility follows PostgreSQL snapshots. WAL and crash-recovery behavior depend on relation persistence; temporary and unlogged tables differ from permanent tables. Index access methods remain separate from the table storage interface.", "/versions/20/tables/0/rows/0/feature": "Tuple slot", "/versions/20/tables/0/rows/1/feature": "Begin scan", "/versions/20/tables/0/rows/2/feature": "Parallel scan initialization", "/versions/20/tables/0/rows/3/feature": "Begin index lookup", "/versions/20/tables/0/rows/4/feature": "Fetch identified tuple", "/versions/20/tables/0/rows/5/feature": "Insert tuple", "/versions/20/tables/0/rows/6/feature": "Update tuple", "/versions/20/tables/0/rows/7/feature": "Delete tuple", "/versions/20/tables/0/rows/8/feature": "Vacuum relation", "/versions/20/tables/0/rows/9/feature": "Analyze block", "/versions/20/tables/0/columns/0/label": "Interface operation", "/versions/20/tables/0/columns/1/label": "Source observation", "/versions/20/tables/0/columns/2/label": "Callback", "/versions/20/tables/0/columns/3/label": "Implementation", "/versions/20/tables/0/rows/10/feature": "TOAST decision", "/versions/20/collection_tables/0/title": "Table AM candidates", "/versions/20/collection_tables/1/title": "Primary-source capability observations", "/versions/20/collection_tables/0/caption": "Current catalogue observation 2026-09-29 from pgext.universe. Extension versions, source metadata dates and declared PostgreSQL compatibility are independent of the selected core version. Catalogue classification does not establish capabilities or maintenance support.", "/versions/20/collection_tables/1/caption": "Each statement applies to its named extension version and immutable source revision. Unlisted capabilities remain unknown. These are documentation observations, not runtime tests or current maintenance guarantees.", "/versions/20/collection_tables/0/rows/0/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/1/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/2/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/3/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/4/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/5/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/6/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/7/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/8/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/9/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/1/rows/0/state": "Verified in documentation", "/versions/20/collection_tables/1/rows/1/state": "Conditional", "/versions/20/collection_tables/1/rows/2/state": "Conditional", "/versions/20/collection_tables/1/rows/3/state": "Verified limitation", "/versions/20/collection_tables/1/rows/4/state": "Unknown", "/versions/20/collection_tables/0/rows/10/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/11/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/12/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/13/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/14/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/15/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/16/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/17/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/18/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/19/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/20/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/0/rows/21/scope": "Primary documentation reviewed separately below", "/versions/20/collection_tables/0/rows/22/scope": "Catalogue candidate; interface unverified", "/versions/20/collection_tables/1/rows/0/detail": "Native columnar Table AM. This reviewed version is an alpha release.", "/versions/20/collection_tables/1/rows/1/detail": "The planner can create parallel columnar scans; cost and worker settings determine plan selection.", "/versions/20/collection_tables/1/rows/2/detail": "Its own vacuum performs no parallel work. CLUSTER, VACUUM FULL and REPACK are rejected; extension compaction functions provide alternatives.", "/versions/20/collection_tables/1/rows/3/detail": "Sampling a columnar table raises an unsupported-operation error.", "/versions/20/collection_tables/1/rows/4/detail": "No distributed transaction guarantee was established by this review.", "/versions/20/collection_tables/0/columns/0/label": "Existing extension", "/versions/20/collection_tables/0/columns/1/label": "Catalogued version", "/versions/20/collection_tables/0/columns/2/label": "Declared PG majors", "/versions/20/collection_tables/0/columns/3/label": "Metadata checked", "/versions/20/collection_tables/0/columns/4/label": "Evidence scope", "/versions/20/collection_tables/0/columns/5/label": "Catalogued purpose", "/versions/20/collection_tables/0/rows/5/postgres": "Unknown", "/versions/20/collection_tables/0/rows/7/postgres": "Unknown", "/versions/20/collection_tables/1/columns/0/label": "Extension", "/versions/20/collection_tables/1/columns/1/label": "Reviewed version", "/versions/20/collection_tables/1/columns/2/label": "Capability", "/versions/20/collection_tables/1/columns/3/label": "Evidence state", "/versions/20/collection_tables/1/columns/4/label": "Conditions", "/versions/20/collection_tables/1/columns/5/label": "Evidence date and source", "/versions/20/collection_tables/0/rows/11/postgres": "Unknown", "/versions/20/collection_tables/0/rows/12/postgres": "Unknown", "/versions/20/collection_tables/0/rows/13/postgres": "Unknown", "/versions/20/collection_tables/0/rows/14/postgres": "Unknown", "/versions/20/collection_tables/0/rows/15/postgres": "Unknown", "/versions/20/collection_tables/0/rows/16/postgres": "Unknown", "/versions/20/collection_tables/0/rows/18/postgres": "Unknown", "/versions/20/collection_tables/0/rows/22/postgres": "Unknown", "/versions/20/collection_tables/1/rows/0/capability": "Table AM identity", "/versions/20/collection_tables/1/rows/1/capability": "Parallel scans", "/versions/20/collection_tables/1/rows/4/capability": "Distributed transaction guarantees", "/versions/20/collection_tables/0/rows/0/description": "Citus columnar storage engine", "/versions/20/collection_tables/0/rows/1/description": "Hydra Columnar extension", "/versions/20/collection_tables/0/rows/2/description": "Columnstore Table in Postgres", "/versions/20/collection_tables/0/rows/3/description": "colcompress and rowcompress Table Access Methods with vectorized execution", "/versions/20/collection_tables/0/rows/4/description": "Experimental append-only compressed table access method for PostgreSQL 12 and later.", "/versions/20/collection_tables/0/rows/5/description": "UNDO storage table access method with in-place updates", "/versions/20/collection_tables/0/rows/6/description": "Experimental table access method for transparent AES-256-CBC encryption of selected column types.", "/versions/20/collection_tables/0/rows/7/description": "PostgreSQL table access method that avoids fragmentation of variable-length append-only data.", "/versions/20/collection_tables/0/rows/8/description": "Experimental PostgreSQL table access method backed by Redis storage.", "/versions/20/collection_tables/0/rows/9/description": "Generates random test data through a PostgreSQL FDW, with an experimental table access method.", "/versions/20/collection_tables/0/rows/10/description": "Columnar PostgreSQL table access method powered by DuckDB and Parquet storage.", "/versions/20/collection_tables/0/rows/11/description": "CSV table access method for PostgreSQL that stores table tuples in CSV-formatted relation files.", "/versions/20/collection_tables/0/rows/12/description": "Experimental in-memory PostgreSQL table access method implemented as a C extension.", "/versions/20/collection_tables/0/rows/13/description": "GFS copy-on-read storage: a Table Access Method whose missing rows are fetched from the source on read and written through locally", "/versions/20/collection_tables/0/rows/14/description": "Delta table access method skeleton", "/versions/20/collection_tables/0/rows/15/description": "Simple table access method that just prints out what functions in the access methods and related functions that are called.", "/versions/20/collection_tables/0/rows/16/description": "TreeDB table access method (Phase 0 prototype)", "/versions/20/collection_tables/0/rows/17/description": "Transparent data encryption for upstream PostgreSQL using the tde_heap access method, including tables, indexes, TOAST, WAL, and temporary files.", "/versions/20/collection_tables/0/rows/18/description": "EDB table access method that preserves clustering locality during inserts.", "/versions/20/collection_tables/0/rows/19/description": "Append-only compressed table access method for time-series workloads.", "/versions/20/collection_tables/0/rows/20/description": "Experimental table access method for compact, cache-friendly row storage.", "/versions/20/collection_tables/0/rows/21/description": "Native column-oriented table access method with compression, vectorized scans, and Parquet workflows.", "/versions/20/collection_tables/0/rows/22/description": "EDB table access method for frequently read, rarely changed reference data."}, "fallback_fields": [], "source_language": "en", "extension_sources": [{"method": "existing extension catalogue", "sha256": "20335bd9693c9f63c07a3e73dbc12db922d36159c0443ecd8918f93e48e9e285", "extension": "citus_columnar"}, {"method": "existing extension catalogue", "sha256": "6c84267c58539dda1d2f99fe2df63fa02fc78f246f382384dc85644bd862816a", "extension": "columnar"}, {"method": "existing extension catalogue", "sha256": "581469ddc7c1660c4c035b66e3728aa821908d19c47a78bb7a474bf1760808f4", "extension": "pg_mooncake"}, {"method": "existing extension catalogue", "sha256": "979a31fb5bf0c2572a5dd40881dc9c5fe402ab445ecc455b44d12208ce28b88f", "extension": "storage_engine"}, {"method": "existing extension 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"relation_needs_toast_table", "implementation": "heapam_relation_needs_toast_table"}], "title": "\u6ce8\u518c\u7684\u63a5\u53e3\u5904\u7406\u51fd\u6570", "columns": [{"key": "feature", "label": "\u63a5\u53e3\u64cd\u4f5c"}, {"key": "state", "label": "\u6e90\u7801\u89c2\u5bdf"}, {"key": "callback", "label": "\u56de\u8c03"}, {"key": "implementation", "label": "\u5b9e\u73b0"}]}], "related": [{"url": "/wiki/catalog/pg_am/?v=18", "label": "\u7cfb\u7edf\u76ee\u5f55 pg_am"}, {"url": "/wiki/guc/default_table_access_method/?v=18", "label": "default_table_access_method"}, {"url": "/wiki/indexam/?v=18", "label": "\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5"}], "release": {"ref": "PostgreSQL 18.6 source archive", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "source_url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://pg.center/docs/18/tableam.html", "path": "tableam.html", "label": "PostgreSQL 18 English manual", "sha256": "e659dece936c960dfea9e801720deb3d76abf2c3696abb3f58d32ac17d0f22aa", "language": "en", "original_url": "/docs/18/tableam.html"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 2616, "path": "src/backend/access/heap/heapam_handler.c", "label": "src/backend/access/heap/heapam_handler.c:2616", "sha256": "fd60a1f8d5530ce5c33fda6b74123c3c22e8c3b9ca6455a0e5d47aa392797a1e", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://pg.center/docs/18/mvcc-intro.html", "path": "mvcc-intro.html", "label": "PostgreSQL 18 English manual", "sha256": "456469051ccd15ec2cfa1f2e656901a3bb63414db367003215ff810d638593e1", "language": "en", "original_url": "/docs/18/mvcc-intro.html"}, {"url": "https://pg.center/docs/18/sql-createtable.html", "path": "sql-createtable.html", "label": "PostgreSQL 18 English manual", "sha256": "b4d703391fe1102d0e02bd6769bef928513eb7a5542f38f7448fc77fe69e0d5b", "language": "en", "original_url": "/docs/18/sql-createtable.html"}, {"url": "https://pg.center/docs/18/routine-vacuuming.html", "path": "routine-vacuuming.html", "label": "PostgreSQL 18 English manual", "sha256": "ede8964df385f5bc69ae991369e6eaf99ae58aa2d6210e8bf868f090bb95b002", "language": "en", "original_url": "/docs/18/routine-vacuuming.html"}, {"url": "https://pg.center/docs/18/catalog-pg-am.html", "path": "catalog-pg-am.html", "label": "PostgreSQL 18 English manual", "sha256": "579364179365a51945e2edb6481df5d198916c2c725e506f166824dedf08994c", "language": "en", "original_url": "/docs/18/catalog-pg-am.html"}], "sections": [{"title": "\u63a5\u53e3\u4e0e\u80fd\u529b\u8fb9\u754c", "paragraphs": ["\u77e9\u9635\u8bb0\u5f55\u6b64\u6e90\u7801\u6784\u5efa\u5b9e\u9645\u6ce8\u518c\u7684\u56de\u8c03\u3002\u6ce8\u518c\u8868\u660e\u5b9e\u73b0\u4e86\u76f8\u5e94\u63a5\u53e3\u94a9\u5b50\uff1b\u64cd\u4f5c\u662f\u5426\u5141\u8bb8\u8fd8\u53d6\u51b3\u4e8e\u9009\u9879\u3001\u67e5\u8be2\u5f62\u5f0f\u3001\u6743\u9650\u548c\u63d0\u4f9b\u65b9\u89c4\u5219\u3002", "\u4e0b\u65b9\u4fdd\u7559\u540c\u7248\u672c\u5b8c\u6574\u624b\u518c\uff0c\u5305\u62ec\u914d\u7f6e\u3001\u7ea6\u675f\u548c\u793a\u4f8b\u3002\u4e0d\u58f0\u79f0\u5df2\u8fdb\u884c\u8fd0\u884c\u65f6\u80fd\u529b\u6d4b\u8bd5\u3002"]}, {"title": "\u5806\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u4e0e WAL", "paragraphs": ["\u6b64\u6e05\u5355\u4ece PostgreSQL 12 \u5f15\u5165\u7684 Table AM \u63a5\u53e3\u5f00\u59cb\u3002\u4e0d\u4f1a\u5c06\u66f4\u65e9\u7248\u672c\u7684 PostgreSQL \u5806\u5b58\u50a8\u91cd\u65b0\u6807\u4e3a Table AM \u5b9e\u73b0\u3002", "\u5806\u53ef\u89c1\u6027\u9075\u5faa PostgreSQL \u5feb\u7167\u3002WAL \u548c\u5d29\u6e83\u6062\u590d\u884c\u4e3a\u53d6\u51b3\u4e8e\u5173\u7cfb\u7684\u6301\u4e45\u6027\uff1b\u4e34\u65f6\u8868\u3001\u65e0\u65e5\u5fd7\u8868\u4e0e\u6c38\u4e45\u8868\u4e0d\u540c\u3002\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u4e0e\u8868\u5b58\u50a8\u63a5\u53e3\u5206\u5f00\u3002"]}, {"code": "{\n\t.type = T_TableAmRoutine,\n\n\t.slot_callbacks = heapam_slot_callbacks,\n\n\t.scan_begin = heap_beginscan,\n\t.scan_end = heap_endscan,\n\t.scan_rescan = heap_rescan,\n\t.scan_getnextslot = heap_getnextslot,\n\n\t.scan_set_tidrange = heap_set_tidrange,\n\t.scan_getnextslot_tidrange = heap_getnextslot_tidrange,\n\n\t.parallelscan_estimate = table_block_parallelscan_estimate,\n\t.parallelscan_initialize = table_block_parallelscan_initialize,\n\t.parallelscan_reinitialize = table_block_parallelscan_reinitialize,\n\n\t.index_fetch_begin = heapam_index_fetch_begin,\n\t.index_fetch_reset = heapam_index_fetch_reset,\n\t.index_fetch_end = heapam_index_fetch_end,\n\t.index_fetch_tuple = heapam_index_fetch_tuple,\n\n\t.tuple_insert = heapam_tuple_insert,\n\t.tuple_insert_speculative = heapam_tuple_insert_speculative,\n\t.tuple_complete_speculative = heapam_tuple_complete_speculative,\n\t.multi_insert = heap_multi_insert,\n\t.tuple_delete = heapam_tuple_delete,\n\t.tuple_update = heapam_tuple_update,\n\t.tuple_lock = heapam_tuple_lock,\n\n\t.tuple_fetch_row_version = heapam_fetch_row_version,\n\t.tuple_get_latest_tid = heap_get_latest_tid,\n\t.tuple_tid_valid = heapam_tuple_tid_valid,\n\t.tuple_satisfies_snapshot = heapam_tuple_satisfies_snapshot,\n\t.index_delete_tuples = heap_index_delete_tuples,\n\n\t.relation_set_new_filelocator = heapam_relation_set_new_filelocator,\n\t.relation_nontransactional_truncate = heapam_relation_nontransactional_truncate,\n\t.relation_copy_data = heapam_relation_copy_data,\n\t.relation_copy_for_cluster = heapam_relation_copy_for_cluster,\n\t.relation_vacuum = heap_vacuum_rel,\n\t.scan_analyze_next_block = heapam_scan_analyze_next_block,\n\t.scan_analyze_next_tuple = heapam_scan_analyze_next_tuple,\n\t.index_build_range_scan = heapam_index_build_range_scan,\n\t.index_validate_scan = heapam_index_validate_scan,\n\n\t.relation_size = table_block_relation_size,\n\t.relation_needs_toast_table = heapam_relation_needs_toast_table,\n\t.relation_toast_am = heapam_relation_toast_am,\n\t.relation_fetch_toast_slice = heap_fetch_toast_slice,\n\n\t.relation_estimate_size = heapam_estimate_rel_size,\n\n\t.scan_bitmap_next_tuple = heapam_scan_bitmap_next_tuple,\n\t.scan_sample_next_block = heapam_scan_sample_next_block,\n\t.scan_sample_next_tuple = heapam_scan_sample_next_tuple\n}", "title": "\u6838\u5fc3\u6e90\u7801\u4e2d\u6ce8\u518c\u7684\u5b9e\u73b0"}], "callbacks": {"scan_end": "heap_endscan", "scan_begin": "heap_beginscan", "tuple_lock": "heapam_tuple_lock", "scan_rescan": "heap_rescan", "multi_insert": "heap_multi_insert", "tuple_delete": "heapam_tuple_delete", "tuple_insert": "heapam_tuple_insert", "tuple_update": "heapam_tuple_update", "relation_size": "table_block_relation_size", "slot_callbacks": "heapam_slot_callbacks", "index_fetch_end": "heapam_index_fetch_end", "relation_vacuum": "heap_vacuum_rel", "tuple_tid_valid": "heapam_tuple_tid_valid", "scan_getnextslot": "heap_getnextslot", "index_fetch_begin": "heapam_index_fetch_begin", "index_fetch_reset": "heapam_index_fetch_reset", "index_fetch_tuple": "heapam_index_fetch_tuple", "relation_toast_am": "heapam_relation_toast_am", "scan_set_tidrange": "heap_set_tidrange", "relation_copy_data": "heapam_relation_copy_data", "index_delete_tuples": "heap_index_delete_tuples", "index_validate_scan": "heapam_index_validate_scan", "tuple_get_latest_tid": "heap_get_latest_tid", "parallelscan_estimate": "table_block_parallelscan_estimate", "index_build_range_scan": "heapam_index_build_range_scan", "relation_estimate_size": "heapam_estimate_rel_size", "scan_bitmap_next_tuple": "heapam_scan_bitmap_next_tuple", "scan_sample_next_block": "heapam_scan_sample_next_block", "scan_sample_next_tuple": "heapam_scan_sample_next_tuple", "parallelscan_initialize": "table_block_parallelscan_initialize", "scan_analyze_next_block": "heapam_scan_analyze_next_block", "scan_analyze_next_tuple": "heapam_scan_analyze_next_tuple", "tuple_fetch_row_version": "heapam_fetch_row_version", "tuple_insert_speculative": "heapam_tuple_insert_speculative", "tuple_satisfies_snapshot": "heapam_tuple_satisfies_snapshot", "parallelscan_reinitialize": "table_block_parallelscan_reinitialize", "relation_copy_for_cluster": "heapam_relation_copy_for_cluster", "scan_getnextslot_tidrange": "heap_getnextslot_tidrange", "relation_fetch_toast_slice": "heap_fetch_toast_slice", "relation_needs_toast_table": "heapam_relation_needs_toast_table", "tuple_complete_speculative": "heapam_tuple_complete_speculative", "relation_set_new_filelocator": "heapam_relation_set_new_filelocator", "relation_nontransactional_truncate": "heapam_relation_nontransactional_truncate"}, "description": ["\u5185\u7f6e heap \u8868\u8bbf\u95ee\u65b9\u6cd5\u5c06\u5143\u7ec4\u5b58\u50a8\u3001\u53ef\u89c1\u6027\u3001\u626b\u63cf\u3001\u7d22\u5f15\u83b7\u53d6\u548c\u7ef4\u62a4\u64cd\u4f5c\u96c6\u6210\u5230 PostgreSQL \u4e2d\u3002"], "manual_html": "
\n
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\n

\u7b2c 62 \u7ae0. Table Access Method Interface Definition

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\n

\u672c\u7ae0\u8bf4\u660e PostgreSQL \u6838\u5fc3\u7cfb\u7edf\u4e0e\u7ba1\u7406\u8868\u5b58\u50a8\u7684\u8868\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u95f4\u7684\u63a5\u53e3\u3002\u9664\u8fd9\u91cc\u89c4\u5b9a\u7684\u5185\u5bb9\u4e4b\u5916\uff0c\u6838\u5fc3\u7cfb\u7edf\u5bf9\u8fd9\u4e9b\u8bbf\u95ee\u65b9\u6cd5\u77e5\u4e4b\u751a\u5c11\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u7f16\u5199\u9644\u52a0\u4ee3\u7801\u6765\u5f00\u53d1\u5168\u65b0\u7684\u8bbf\u95ee\u65b9\u6cd5\u7c7b\u578b\u3002

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\u6bcf\u4e2a\u8868\u8bbf\u95ee\u65b9\u6cd5\u90fd\u7531\u7cfb\u7edf\u76ee\u5f55 pg_am \u4e2d\u7684\u4e00\u884c\u63cf\u8ff0\u3002pg_am \u6761\u76ee\u6307\u5b9a\u4e86\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u53ca\u4e00\u4e2a\u5904\u7406\u5668\u51fd\u6570\u3002\u8fd9\u4e9b\u6761\u76ee\u53ef\u4ee5\u901a\u8fc7CREATE ACCESS METHOD\u548cDROP ACCESS METHOD SQL \u547d\u4ee4\u521b\u5efa\u548c\u5220\u9664\u3002

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\u8868\u8bbf\u95ee\u65b9\u6cd5\u7684\u5904\u7406\u5668\u51fd\u6570\u5fc5\u987b\u58f0\u660e\u4e3a\u63a5\u53d7\u4e00\u4e2a internal \u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4f2a\u7c7b\u578b table_am_handler\u3002\u8fd9\u4e2a\u53c2\u6570\u53ea\u662f\u4e00\u4e2a\u5360\u4f4d\u503c\uff0c\u7528\u6765\u9632\u6b62\u5904\u7406\u5668\u51fd\u6570\u88ab SQL \u547d\u4ee4\u76f4\u63a5\u8c03\u7528\u3002

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\u4e0b\u9762\u5c55\u793a\u6269\u5c55 SQL \u811a\u672c\u6587\u4ef6\u5982\u4f55\u521b\u5efa\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\uff1a

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CREATE OR REPLACE FUNCTION my_tableam_handler(internal)\n  RETURNS table_am_handler AS 'my_extension', 'my_tableam_handler'\n  LANGUAGE C STRICT;\n\nCREATE ACCESS METHOD myam TYPE TABLE HANDLER my_tableam_handler;\n
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\u8be5\u51fd\u6570\u7684\u7ed3\u679c\u5fc5\u987b\u662f\u4e00\u4e2a\u6307\u5411 TableAmRoutine \u7ed3\u6784\u4f53\u7684\u6307\u9488\uff0c\u5176\u4e2d\u5305\u542b\u6838\u5fc3\u4ee3\u7801\u4f7f\u7528\u8be5\u8868\u8bbf\u95ee\u65b9\u6cd5\u6240\u9700\u7684\u5168\u90e8\u4fe1\u606f\u3002\u8fd4\u56de\u503c\u9700\u8981\u5177\u6709\u670d\u52a1\u5668\u751f\u547d\u5468\u671f\uff0c\u8fd9\u901a\u5e38\u901a\u8fc7\u5c06\u5176\u5b9a\u4e49\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 static const \u53d8\u91cf\u6765\u5b9e\u73b0\u3002

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\u4e0b\u9762\u662f\u4e00\u4e2a\u5305\u542b\u8868\u8bbf\u95ee\u65b9\u6cd5\u5904\u7406\u5668\u7684\u6e90\u6587\u4ef6\u793a\u4f8b\uff1a

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#include \"postgres.h\"\n\n#include \"access/tableam.h\"\n#include \"fmgr.h\"\n\nPG_MODULE_MAGIC;\n\nstatic const TableAmRoutine my_tableam_methods = {\n    .type = T_TableAmRoutine,\n\n    /* Methods of TableAmRoutine omitted from example, add them here. */\n};\n\nPG_FUNCTION_INFO_V1(my_tableam_handler);\n\nDatum\nmy_tableam_handler(PG_FUNCTION_ARGS)\n{\n    PG_RETURN_POINTER(&my_tableam_methods);\n}\n\n
\n

TableAmRoutine \u7ed3\u6784\u4f53\u4e5f\u79f0\u4e3a\u8be5\u8bbf\u95ee\u65b9\u6cd5\u7684API \u7ed3\u6784\u4f53\uff0c\u5b83\u901a\u8fc7\u56de\u8c03\u6765\u5b9a\u4e49\u8bbf\u95ee\u65b9\u6cd5\u7684\u884c\u4e3a\u3002\u8fd9\u4e9b\u56de\u8c03\u662f\u666e\u901a C \u51fd\u6570\u7684\u6307\u9488\uff0c\u5728 SQL \u5c42\u65e2\u4e0d\u53ef\u89c1\u4e5f\u4e0d\u53ef\u8c03\u7528\u3002\u6240\u6709\u56de\u8c03\u53ca\u5176\u884c\u4e3a\u90fd\u5b9a\u4e49\u5728 TableAmRoutine \u7ed3\u6784\u4f53\u4e2d\uff08\u7ed3\u6784\u4f53\u5185\u7684\u6ce8\u91ca\u8bf4\u660e\u4e86\u5bf9\u56de\u8c03\u7684\u8981\u6c42\uff09\u3002\u5927\u591a\u6570\u56de\u8c03\u90fd\u6709\u5305\u88c5\u51fd\u6570\uff0c\u5176\u6587\u6863\u662f\u4ece\u8868\u8bbf\u95ee\u65b9\u6cd5\u4f7f\u7528\u8005\u800c\u975e\u5b9e\u73b0\u8005\u7684\u89d2\u5ea6\u7f16\u5199\u7684\u3002\u8be6\u60c5\u8bf7\u53c2\u9605 src/include/access/tableam.h \u6587\u4ef6\u3002

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\u5b9e\u73b0\u8bbf\u95ee\u65b9\u6cd5\u65f6\uff0c\u901a\u5e38\u9700\u8981\u5b9e\u73b0\u4e13\u7528\u7684\u5143\u7ec4\u8868\u69fd\u4f4d\u7c7b\u578b\uff08\u53c2\u89c1 src/include/executor/tuptable.h\uff09\uff0c\u4f7f\u8bbf\u95ee\u65b9\u6cd5\u4e4b\u5916\u7684\u4ee3\u7801\u53ef\u4ee5\u6301\u6709\u8be5\u65b9\u6cd5\u7684\u5143\u7ec4\u5f15\u7528\uff0c\u5e76\u8bbf\u95ee\u5143\u7ec4\u5404\u5217\u3002

\n

\u76ee\u524d\uff0cAM \u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u6240\u53d7\u9650\u5236\u76f8\u5f53\u5c11\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 postgres \u7684\u5171\u4eab\u7f13\u51b2\u533a\u7f13\u5b58\uff0c\u4f46\u8fd9\u5e76\u975e\u5fc5\u9700\u3002\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u90a3\u4e48\u91c7\u7528 PostgreSQL \u5728\u7b2c\u00a066.6\u00a0\u8282\u4e2d\u63cf\u8ff0\u7684\u6807\u51c6\u9875\u9762\u5e03\u5c40\u901a\u5e38\u662f\u6709\u610f\u4e49\u7684\u3002

\n

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\n

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\n

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\n

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Registration identifies an implemented interface hook; options, query shape, privileges and provider rules determine whether an operation is allowed.", "/versions/18/sections/0/paragraphs/1": "The complete same-version manual below retains configuration, constraints and examples. No runtime capability test is claimed.", "/versions/18/sections/1/paragraphs/0": "This inventory starts with the Table AM interface in PostgreSQL 12. Earlier PostgreSQL heap storage is not relabeled as a Table AM implementation.", "/versions/18/sections/1/paragraphs/1": "Heap visibility follows PostgreSQL snapshots. WAL and crash-recovery behavior depend on relation persistence; temporary and unlogged tables differ from permanent tables. 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