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kB\uff0c\u4e0d\u8fc7\u5728\u7f16\u8bd1\u670d\u52a1\u5668\u65f6\u53ef\u4ee5\u9009\u62e9\u4e0d\u540c\u7684\u9875\u9762\u5927\u5c0f\uff09\u3002\u5728\u8868\u4e2d\uff0c\u6240\u6709\u9875\u9762\u5728\u903b\u8f91\u4e0a\u90fd\u662f\u7b49\u4ef7\u7684\uff0c\u56e0\u6b64\u67d0\u4e2a\u7279\u5b9a\u9879\uff08\u884c\uff09\u53ef\u4ee5\u5b58\u653e\u5728\u4efb\u610f\u9875\u9762\u4e2d\u3002\u5728\u7d22\u5f15\u4e2d\uff0c\u7b2c\u4e00\u9875\u901a\u5e38\u4fdd\u7559\u4e3a \u5143\u9875 \uff0c\u7528\u4e8e\u4fdd\u5b58\u63a7\u5236\u4fe1\u606f\uff1b\u5e76\u4e14\u6839\u636e\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u7684\u4e0d\u540c\uff0c\u7d22\u5f15\u4e2d\u8fd8\u53ef\u80fd\u5b58\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u9875\u9762\u3002 \u8868 66.2 \u5c55\u793a\u4e86\u9875\u9762\u7684\u603b\u4f53\u5e03\u5c40\u3002\u6bcf\u4e2a\u9875\u9762\u5305\u542b\u4e94\u4e2a\u90e8\u5206\u3002", "aliases": [], "content_hash": "845228547f5615cea132a748465b179f6ae7dcd8d2a11405887e74118b1d044e", "versions": {"10": {"facts": [{"label": 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kB\uff0c\u4e0d\u8fc7\u5728\u7f16\u8bd1\u670d\u52a1\u5668\u65f6\u53ef\u4ee5\u9009\u62e9\u4e0d\u540c\u7684\u9875\u9762\u5927\u5c0f\uff09\u3002\u5728\u8868\u4e2d\uff0c\u6240\u6709\u9875\u9762\u5728\u903b\u8f91\u4e0a\u90fd\u662f\u7b49\u4ef7\u7684\uff0c\u56e0\u6b64\u67d0\u4e2a\u7279\u5b9a\u9879\uff08\u884c\uff09\u53ef\u4ee5\u5b58\u653e\u5728\u4efb\u610f\u9875\u9762\u4e2d\u3002\u5728\u7d22\u5f15\u4e2d\uff0c\u7b2c\u4e00\u9875\u901a\u5e38\u4fdd\u7559\u4e3a \u5143\u9875 \uff0c\u7528\u4e8e\u4fdd\u5b58\u63a7\u5236\u4fe1\u606f\uff1b\u5e76\u4e14\u6839\u636e\u7d22\u5f15\u8bbf\u95ee\u65b9\u6cd5\u7684\u4e0d\u540c\uff0c\u7d22\u5f15\u4e2d\u8fd8\u53ef\u80fd\u5b58\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u9875\u9762\u3002 \u8868 73.2 \u5c55\u793a\u4e86\u9875\u9762\u7684\u603b\u4f53\u5e03\u5c40\u3002\u6bcf\u4e2a\u9875\u9762\u5305\u542b\u4e94\u4e2a\u90e8\u5206\u3002"], "comparison_hash": "b621fa85b3be27a0eb0d82986e9524f2ef0a776761901f0d429826eec4822d0a"}, "16": {"facts": [{"label": "\u5b9a\u4e49\u8303\u56f4", 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\u57fa\u7840\u8bbe\u65bd\u4e5f\u88ab\u7528\u4e8e\u6539\u8fdb\u5185\u5b58\u4e2d\u5927\u578b\u6570\u636e\u503c\u7684\u5904\u7406\u3002 \u53ea\u6709\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u652f\u6301 TOAST \uff0c\u56e0\u4e3a\u6ca1\u6709\u5fc5\u8981\u8ba9\u90a3\u4e9b\u4e0d\u53ef\u80fd\u4ea7\u751f\u5927\u5b57\u6bb5\u503c\u7684\u6570\u636e\u7c7b\u578b\u627f\u62c5\u8fd9\u90e8\u5206\u989d\u5916\u5f00\u9500\u3002\u8981\u652f\u6301 TOAST \uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u5177\u6709\u53d8\u957f\uff08 varlena \uff09\u8868\u793a\u5f62\u5f0f\uff0c\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55\u5df2\u5b58\u50a8\u503c\u7684\u7b2c\u4e00\u4e2a\u56db\u5b57\u8282\u5b57\u90fd\u5305\u542b\u8be5\u503c\u4ee5\u5b57\u8282\u8ba1\u7684\u603b\u957f\u5ea6\uff08\u5305\u62ec\u5176\u81ea\u8eab\uff09\u3002 TOAST \u5bf9\u8be5\u6570\u636e\u7c7b\u578b\u8868\u793a\u5f62\u5f0f\u7684\u5176\u4f59\u90e8\u5206\u6ca1\u6709\u7ea6\u675f\u3002\u7edf\u79f0\u4e3a \u7ecf\u8fc7 TOAST \u5904\u7406\u7684\u503c \u7684\u7279\u6b8a\u8868\u793a\u5f62\u5f0f\uff0c\u662f\u901a\u8fc7\u4fee\u6539\u6216\u91cd\u65b0\u89e3\u91ca\u8fd9\u4e2a\u521d\u59cb\u957f\u5ea6\u5b57\u6765\u5de5\u4f5c\u7684\u3002\u56e0\u6b64\uff0c\u652f\u6301\u53ef TOAST \u6570\u636e\u7c7b\u578b\u7684 C \u7ea7\u51fd\u6570\uff0c\u5fc5\u987b\u5c0f\u5fc3\u5904\u7406\u53ef\u80fd\u5df2\u7ecf\u8fc7 TOAST \u5904\u7406\u7684\u8f93\u5165\u503c\uff1a\u5728\u88ab \u53bb TOAST \u5316 \u4e4b\u524d\uff0c\u4e00\u4e2a\u8f93\u5165\u503c\u672a\u5fc5\u771f\u6b63\u7531\u56db\u5b57\u8282\u957f\u5ea6\u5b57\u548c\u5185\u5bb9\u7ec4\u6210\u3002\uff08\u901a\u5e38\u662f\u5728\u5bf9\u8f93\u5165\u503c\u505a\u4efb\u4f55\u5904\u7406\u4e4b\u524d\u8c03\u7528 PG_DETOAST_DATUM \uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 36.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum \u7684\u603b\u5927\u5c0f\uff08\u5305\u62ec\u957f\u5ea6\u5b57\uff09\uff0c\u4ee5\u5b57\u8282\u8ba1\u3002\u5f53\u6700\u9ad8\u4f4d\u6216\u6700\u4f4e\u4f4d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u8be5\u503c\u4f7f\u7528\u7684\u4e0d\u662f\u901a\u5e38\u7684\u56db\u5b57\u8282\u5934\u90e8\uff0c\u800c\u662f\u5355\u5b57\u8282\u5934\u90e8\uff1b\u8be5\u5b57\u8282\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa datum \u7684\u603b\u5927\u5c0f\uff08\u5305\u62ec\u957f\u5ea6\u5b57\u8282\uff09\uff0c\u4ee5\u5b57\u8282\u8ba1\u3002\u8fd9\u6837\u65e2\u80fd\u9ad8\u6548\u5b58\u50a8\u77ed\u4e8e 127 \u5b57\u8282\u7684\u503c\uff0c\u53c8\u4ecd\u7136\u5141\u8bb8\u6570\u636e\u7c7b\u578b\u5728\u9700\u8981\u65f6\u589e", "aliases": [], "content_hash": "47d8ced08922e29e99adeb8528c5fdc25bf5e5df6c8f936dc0deb648bfc5687c", "versions": {"10": {"facts": [{"label": "\u5b9a\u4e49\u8303\u56f4", "value": "\u540c\u7248\u672c\u6838\u5fc3\u7269\u7406\u5b58\u50a8\u6587\u6863"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "label": "10.23", "major": "10", "channel": "stable", "revision": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, "signature": "", "description": ["\u672c\u8282\u6982\u8ff0\u8d85\u957f\u5c5e\u6027\u5b58\u50a8\u6280\u672f\uff08 TOAST , The Oversized-Attribute Storage Technique\uff09\u3002 PostgreSQL \u4f7f\u7528\u56fa\u5b9a\u9875\u9762\u5927\u5c0f\uff08\u901a\u5e38\u4e3a 8 kB\uff09\uff0c\u5e76\u4e14\u4e0d\u5141\u8bb8\u5143\u7ec4\u8de8\u8d8a\u591a\u4e2a\u9875\u9762\u3002\u56e0\u6b64\uff0c\u65e0\u6cd5\u76f4\u63a5\u5b58\u50a8\u975e\u5e38\u5927\u7684\u5b57\u6bb5\u503c\u3002\u4e3a\u514b\u670d\u8fd9\u4e00\u9650\u5236\uff0c\u5927\u5b57\u6bb5\u503c\u4f1a\u88ab\u538b\u7f29\u5e76\u4e14/\u6216\u8005\u62c6\u5206\u6210\u591a\u4e2a\u7269\u7406\u884c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u5bf9\u7528\u6237\u662f\u900f\u660e\u7684\uff0c\u800c\u4e14\u5bf9\u5927\u90e8\u5206\u540e\u7aef\u4ee3\u7801\u7684\u5f71\u54cd\u5f88\u5c0f\u3002\u8fd9\u9879\u6280\u672f\u88ab\u4eb2\u5207\u5730\u79f0\u4e3a TOAST \uff08\u6216\u8005 \u201c \u81ea\u5207\u7247\u9762\u5305\u95ee\u4e16\u4ee5\u6765\u6700\u68d2\u7684\u4e1c\u897f \u201d \uff09\u3002 TOAST \u57fa\u7840\u8bbe\u65bd\u4e5f\u88ab\u7528\u4e8e\u6539\u8fdb\u5185\u5b58\u4e2d\u5927\u578b\u6570\u636e\u503c\u7684\u5904\u7406\u3002 \u53ea\u6709\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u652f\u6301 TOAST \uff0c\u56e0\u4e3a\u6ca1\u6709\u5fc5\u8981\u8ba9\u90a3\u4e9b\u4e0d\u53ef\u80fd\u4ea7\u751f\u5927\u5b57\u6bb5\u503c\u7684\u6570\u636e\u7c7b\u578b\u627f\u62c5\u8fd9\u90e8\u5206\u989d\u5916\u5f00\u9500\u3002\u8981\u652f\u6301 TOAST \uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u5177\u6709\u53d8\u957f\uff08 varlena \uff09\u8868\u793a\u5f62\u5f0f\uff0c\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55\u5df2\u5b58\u50a8\u503c\u7684\u7b2c\u4e00\u4e2a\u56db\u5b57\u8282\u5b57\u90fd\u5305\u542b\u8be5\u503c\u4ee5\u5b57\u8282\u8ba1\u7684\u603b\u957f\u5ea6\uff08\u5305\u62ec\u5176\u81ea\u8eab\uff09\u3002 TOAST \u5bf9\u8be5\u6570\u636e\u7c7b\u578b\u8868\u793a\u5f62\u5f0f\u7684\u5176\u4f59\u90e8\u5206\u6ca1\u6709\u7ea6\u675f\u3002\u7edf\u79f0\u4e3a \u7ecf\u8fc7 TOAST \u5904\u7406\u7684\u503c \u7684\u7279\u6b8a\u8868\u793a\u5f62\u5f0f\uff0c\u662f\u901a\u8fc7\u4fee\u6539\u6216\u91cd\u65b0\u89e3\u91ca\u8fd9\u4e2a\u521d\u59cb\u957f\u5ea6\u5b57\u6765\u5de5\u4f5c\u7684\u3002\u56e0\u6b64\uff0c\u652f\u6301\u53ef TOAST \u6570\u636e\u7c7b\u578b\u7684 C \u7ea7\u51fd\u6570\uff0c\u5fc5\u987b\u5c0f\u5fc3\u5904\u7406\u53ef\u80fd\u5df2\u7ecf\u8fc7 TOAST \u5904\u7406\u7684\u8f93\u5165\u503c\uff1a\u5728\u88ab \u53bb TOAST \u5316 \u4e4b\u524d\uff0c\u4e00\u4e2a\u8f93\u5165\u503c\u672a\u5fc5\u771f\u6b63\u7531\u56db\u5b57\u8282\u957f\u5ea6\u5b57\u548c\u5185\u5bb9\u7ec4\u6210\u3002\uff08\u901a\u5e38\u662f\u5728\u5bf9\u8f93\u5165\u503c\u505a\u4efb\u4f55\u5904\u7406\u4e4b\u524d\u8c03\u7528 PG_DETOAST_DATUM \uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 37.11.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 37.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 38.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 38.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff08\u6216\u8005 \u201c \u81ea\u5207\u7247\u9762\u5305\u95ee\u4e16\u4ee5\u6765\u6700\u68d2\u7684\u4e1c\u897f \u201d \uff09\u3002 TOAST \u57fa\u7840\u8bbe\u65bd\u4e5f\u88ab\u7528\u4e8e\u6539\u8fdb\u5185\u5b58\u4e2d\u5927\u578b\u6570\u636e\u503c\u7684\u5904\u7406\u3002 \u53ea\u6709\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u652f\u6301 TOAST \uff0c\u56e0\u4e3a\u6ca1\u6709\u5fc5\u8981\u8ba9\u90a3\u4e9b\u4e0d\u53ef\u80fd\u4ea7\u751f\u5927\u5b57\u6bb5\u503c\u7684\u6570\u636e\u7c7b\u578b\u627f\u62c5\u8fd9\u90e8\u5206\u989d\u5916\u5f00\u9500\u3002\u8981\u652f\u6301 TOAST \uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u5177\u6709\u53d8\u957f\uff08 varlena \uff09\u8868\u793a\u5f62\u5f0f\uff0c\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55\u5df2\u5b58\u50a8\u503c\u7684\u7b2c\u4e00\u4e2a\u56db\u5b57\u8282\u5b57\u90fd\u5305\u542b\u8be5\u503c\u4ee5\u5b57\u8282\u8ba1\u7684\u603b\u957f\u5ea6\uff08\u5305\u62ec\u5176\u81ea\u8eab\uff09\u3002 TOAST 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 38.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 36.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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\uff08\u6216\u8005 \u201c \u81ea\u5207\u7247\u9762\u5305\u95ee\u4e16\u4ee5\u6765\u6700\u68d2\u7684\u4e1c\u897f \u201d \uff09\u3002 TOAST \u57fa\u7840\u8bbe\u65bd\u4e5f\u88ab\u7528\u4e8e\u6539\u8fdb\u5185\u5b58\u4e2d\u5927\u578b\u6570\u636e\u503c\u7684\u5904\u7406\u3002 \u53ea\u6709\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u652f\u6301 TOAST \uff0c\u56e0\u4e3a\u6ca1\u6709\u5fc5\u8981\u8ba9\u90a3\u4e9b\u4e0d\u53ef\u80fd\u4ea7\u751f\u5927\u5b57\u6bb5\u503c\u7684\u6570\u636e\u7c7b\u578b\u627f\u62c5\u8fd9\u90e8\u5206\u989d\u5916\u5f00\u9500\u3002\u8981\u652f\u6301 TOAST \uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u5177\u6709\u53d8\u957f\uff08 varlena \uff09\u8868\u793a\u5f62\u5f0f\uff0c\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55\u5df2\u5b58\u50a8\u503c\u7684\u7b2c\u4e00\u4e2a\u56db\u5b57\u8282\u5b57\u90fd\u5305\u542b\u8be5\u503c\u4ee5\u5b57\u8282\u8ba1\u7684\u603b\u957f\u5ea6\uff08\u5305\u62ec\u5176\u81ea\u8eab\uff09\u3002 TOAST 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\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u91c7\u7528\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002\u8be6\u89c1 \u7b2c 36.13.1 \u8282 \u3002\uff09 TOAST \u4f1a\u5360\u7528 varlena \u957f\u5ea6\u5b57\u4e2d\u7684\u4e24\u4e2a\u4f4d\uff08\u5728\u5927\u7aef\u673a\u5668\u4e0a\u662f\u6700\u9ad8\u7684\u4e24\u4f4d\uff0c\u5728\u5c0f\u7aef\u673a\u5668\u4e0a\u662f\u6700\u4f4e\u7684\u4e24\u4f4d\uff09\uff0c\u4ece\u800c\u628a\u4efb\u4f55\u53ef TOAST \u6570\u636e\u7c7b\u578b\u503c\u7684\u903b\u8f91\u5927\u5c0f\u9650\u5236\u4e3a 1 GB\uff082 30 - 1 \u5b57\u8282\uff09\u3002\u5f53\u8fd9\u4e24\u4e2a\u4f4d\u90fd\u4e3a\u96f6\u65f6\uff0c\u8be5\u503c\u5c31\u662f\u8fd9\u79cd\u6570\u636e\u7c7b\u578b\u7684\u666e\u901a\u3001\u672a\u7ecf TOAST \u5904\u7406\u7684\u503c\uff0c\u957f\u5ea6\u5b57\u7684\u5176\u4f59\u4f4d\u7ed9\u51fa\u8be5 datum 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TOAST \uff08\u6216\u8005 \u201c \u81ea\u5207\u7247\u9762\u5305\u95ee\u4e16\u4ee5\u6765\u6700\u68d2\u7684\u4e1c\u897f \u201d \uff09\u3002 TOAST \u57fa\u7840\u8bbe\u65bd\u4e5f\u88ab\u7528\u4e8e\u6539\u8fdb\u5185\u5b58\u4e2d\u5927\u578b\u6570\u636e\u503c\u7684\u5904\u7406\u3002 \u53ea\u6709\u67d0\u4e9b\u6570\u636e\u7c7b\u578b\u652f\u6301 TOAST \uff0c\u56e0\u4e3a\u6ca1\u6709\u5fc5\u8981\u8ba9\u90a3\u4e9b\u4e0d\u53ef\u80fd\u4ea7\u751f\u5927\u5b57\u6bb5\u503c\u7684\u6570\u636e\u7c7b\u578b\u627f\u62c5\u8fd9\u90e8\u5206\u989d\u5916\u5f00\u9500\u3002\u8981\u652f\u6301 TOAST \uff0c\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u5177\u6709\u53d8\u957f\uff08 varlena \uff09\u8868\u793a\u5f62\u5f0f\uff0c\u5728\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4efb\u4f55\u5df2\u5b58\u50a8\u503c\u7684\u7b2c\u4e00\u4e2a\u56db\u5b57\u8282\u5b57\u90fd\u5305\u542b\u8be5\u503c\u4ee5\u5b57\u8282\u8ba1\u7684\u603b\u957f\u5ea6\uff08\u5305\u62ec\u5176\u81ea\u8eab\uff09\u3002 TOAST 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"state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 11 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=11"}, {"major": "12", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 12 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=12"}, {"major": "13", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 13 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=13"}, {"major": "14", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 14 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=14"}, {"major": "15", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 15 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=15"}, {"major": "16", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 16 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=16"}, {"major": "17", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 17 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=17"}, {"major": "18", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 18 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=18"}, {"major": "19", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 19 rc 2 \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=19"}, {"major": "20", "state": "present", "label": "\u5df2\u6536\u5f55", "title": "PostgreSQL 20 devel \u00b7 \u5df2\u6536\u5f55", "url": "/wiki/storage/storage-toast/?v=20"}], "present": true}, {"slug": "tuple-layout", "name": "Table row layout", "name_zh": "", "category": "\u7269\u7406\u7ed3\u6784", "summary": "\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 66.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 66.2 \u8282 ", "aliases": [], "content_hash": "2fea2191f2004a905a3beb2e0ee1d8f86f606ac4533506521a07cacd0783c3a1", "versions": {"11": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "label": "11.22", "major": "11", "channel": "stable", "revision": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 69.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u603b\u5171\u4e3a t_natts \u4f4d\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 69.2 \u8282 \uff09\u3002"], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "12": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "label": "12.22", "major": "12", "channel": "stable", "revision": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 69.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 69.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "13": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "label": "13.23", "major": "13", "channel": "stable", "revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 69.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 69.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "14": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "label": "14.24", "major": "14", "channel": "stable", "revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 70.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 70.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "15": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "label": "15.19", "major": "15", "channel": "stable", "revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 73.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 73.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "16": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "label": "16.15", "major": "16", "channel": "stable", "revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 73.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 73.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "17": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "label": "17.11", "major": "17", "channel": "stable", "revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 65.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 65.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "18": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 66.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 struct varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 66.2 \u8282 "], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "19": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/source/v19rc1/postgresql-19rc1.tar.bz2", "label": "19rc1", "major": "19", "channel": "preview", "revision": "af105fc8e960fc836a09fc2cd7f582b49fd17675d9d36631abe3a565bfd7d701"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 66.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign \u3002\u9664\u975e\u6240\u6709\u5b57\u6bb5\u90fd\u662f\u5b9a\u5bbd\u4e14\u6ca1\u6709\u7a7a\u503c\uff0c\u5426\u5219\u6ca1\u6709\u529e\u6cd5\u76f4\u63a5\u53d6\u5f97\u67d0\u4e2a\u7279\u5b9a\u5c5e\u6027\u3002\u6240\u6709\u8fd9\u4e9b\u6280\u5de7\u90fd\u5c01\u88c5\u5728 heap_getattr \u3001 fastgetattr \u548c heap_getsysattr \u8fd9\u4e9b\u51fd\u6570\u4e2d\u3002 \u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u9700\u8981\u4f9d\u6b21\u68c0\u67e5\u6bcf\u4e2a\u5c5e\u6027\u3002\u9996\u5148\u6839\u636e\u7a7a\u503c\u4f4d\u56fe\u5224\u65ad\u8be5\u5b57\u6bb5\u662f\u5426\u4e3a NULL\u3002\u5982\u679c\u662f\uff0c\u5c31\u7ee7\u7eed\u4e0b\u4e00\u4e2a\u3002\u7136\u540e\u786e\u8ba4\u5bf9\u9f50\u662f\u5426\u6b63\u786e\u3002\u5982\u679c\u5b57\u6bb5\u662f\u5b9a\u5bbd\u5b57\u6bb5\uff0c\u90a3\u4e48\u5b83\u7684\u6240\u6709\u5b57\u8282\u90fd\u662f\u76f4\u63a5\u6446\u653e\u7684\uff1b\u5982\u679c\u5b83\u662f\u53d8\u957f\u5b57\u6bb5\uff08attlen = -1\uff09\uff0c\u60c5\u51b5\u5c31\u4f1a\u7a0d\u590d\u6742\u4e00\u4e9b\u3002\u6240\u6709\u53d8\u957f\u6570\u636e\u7c7b\u578b\u90fd\u5171\u4eab\u4e00\u4e2a\u901a\u7528\u5934\u90e8\u7ed3\u6784\u4f53 varlena \uff0c\u5176\u4e2d\u5305\u542b\u5df2\u5b58\u50a8\u503c\u7684\u603b\u957f\u5ea6\u4ee5\u53ca\u4e00\u4e9b\u6807\u5fd7\u4f4d\u3002\u6839\u636e\u8fd9\u4e9b\u6807\u5fd7\uff0c\u6570\u636e\u53ef\u80fd\u662f\u884c\u5185\u5b58\u50a8\u7684\uff0c\u4e5f\u53ef\u80fd\u4f4d\u4e8e TOAST \u8868\u4e2d\uff1b\u5b83\u4e5f\u53ef\u80fd\u662f\u7ecf\u8fc7\u538b\u7f29\u7684\uff08\u89c1 \u7b2c 66.2 \u8282 \uff09\u3002"], "comparison_hash": "7f6e968716966dae8869d6c14f0a6aa229d745d4d4bde899b61eeec58c8d7ea0"}, "20": {"facts": [], "release": {"ref": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "label": "20devel", "major": "20", "channel": "devel", "revision": "49c73aa4c9cacef8ca979276a28ac416c08e9e54c9baee4ae5fd116a35fa13ac"}, "signature": "", "description": ["\u6240\u6709\u8868\u884c\u7684\u7ed3\u6784\u90fd\u76f8\u540c\u3002\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u56fa\u5b9a\u5927\u5c0f\u7684\u5934\u90e8\uff08\u5728\u5927\u591a\u6570\u673a\u5668\u4e0a\u5360 23 \u5b57\u8282\uff09\uff0c\u540e\u9762\u8ddf\u7740\u53ef\u9009\u7684\u7a7a\u503c\u4f4d\u56fe\u3001\u53ef\u9009\u7684\u5bf9\u8c61 ID \u5b57\u6bb5\u4ee5\u53ca\u7528\u6237\u6570\u636e\u3002\u5934\u90e8\u7684\u8be6\u7ec6\u683c\u5f0f\u89c1 \u8868 66.4 \u3002\u5b9e\u9645\u7528\u6237\u6570\u636e\uff08\u884c\u7684\u5404\u5217\uff09\u4ece t_hoff \u6307\u793a\u7684\u504f\u79fb\u4f4d\u7f6e\u5f00\u59cb\uff0c\u5b83\u5fc5\u987b\u59cb\u7ec8\u662f\u8be5\u5e73\u53f0 MAXALIGN \u5bf9\u9f50\u5355\u4f4d\u7684\u6574\u6570\u500d\u3002\u53ea\u6709\u5f53 HEAP_HASNULL \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u7a7a\u503c\u4f4d\u56fe\u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u7d27\u968f\u56fa\u5b9a\u5934\u90e8\u4e4b\u540e\uff0c\u5e76\u5360\u7528\u8db3\u591f\u591a\u7684\u5b57\u8282\uff0c\u4ee5\u4fbf\u4e3a\u6bcf\u4e2a\u6570\u636e\u5217\u63d0\u4f9b\u4e00\u4f4d\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u5176\u4f4d\u6570\u7b49\u4e8e t_infomask2 \u4e2d\u7684\u5c5e\u6027\u4e2a\u6570\uff09\u3002\u5728\u8fd9\u4e2a\u4f4d\u56fe\u4e2d\uff0c1 \u8868\u793a\u975e\u7a7a\uff0c0 \u8868\u793a\u7a7a\u503c\u3002\u5f53\u4f4d\u56fe\u4e0d\u5b58\u5728\u65f6\uff0c\u5047\u5b9a\u6240\u6709\u5217\u90fd\u975e\u7a7a\u3002\u53ea\u6709\u5f53 HEAP_HASOID_OLD \u4f4d\u5728 t_infomask \u4e2d\u88ab\u7f6e\u4f4d\u65f6\uff0c\u5bf9\u8c61 ID \u624d\u5b58\u5728\u3002\u82e5\u5b58\u5728\uff0c\u5b83\u4f4d\u4e8e t_hoff \u8fb9\u754c\u4e4b\u524d\u3002\u4e3a\u4e86\u8ba9 t_hoff \u6210\u4e3a MAXALIGN \u7684\u6574\u6570\u500d\u6240\u9700\u7684\u4efb\u4f55\u586b\u5145\uff0c\u90fd\u4f1a\u51fa\u73b0\u5728\u7a7a\u503c\u4f4d\u56fe\u4e0e\u5bf9\u8c61 ID \u4e4b\u95f4\u3002\uff08\u8fd9\u53c8\u53cd\u8fc7\u6765\u4fdd\u8bc1\u4e86\u5bf9\u8c61 ID \u7684\u5bf9\u9f50\u662f\u5408\u9002\u7684\u3002\uff09 \u6240\u6709\u7ec6\u8282\u90fd\u53ef\u4ee5\u5728 src/include/access/htup_details.h \u4e2d\u627e\u5230\u3002 \u8981\u89e3\u91ca\u5b9e\u9645\u6570\u636e\uff0c\u5fc5\u987b\u501f\u52a9\u4ece\u5176\u4ed6\u8868\u4e2d\u83b7\u5f97\u7684\u4fe1\u606f\uff0c\u5176\u4e2d\u5927\u90e8\u5206\u6765\u81ea pg_attribute \u3002\u8bc6\u522b\u5b57\u6bb5\u4f4d\u7f6e\u6240\u9700\u7684\u5173\u952e\u503c\u662f attlen \u548c attalign 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\u6587\u4ef6\u7684\u78c1\u76d8\u7a7a\u95f4\u9700\u6c42\uff0c\u5e76\u5b8c\u6210\u4efb\u4f55\u5fc5\u8981\u8c03\u4f18\u4e4b\u5916\uff0c\u4e0d\u9700\u8981\u518d\u505a\u5176\u4ed6\u64cd\u4f5c\uff08\u89c1 \u7b2c 30.4 \u8282 \uff09\u3002 \u6bcf\u5199\u5165\u4e00\u6761\u65b0\u8bb0\u5f55\uff0c WAL \u8bb0\u5f55\u5c31\u4f1a\u8ffd\u52a0\u5230 WAL \u6587\u4ef6\u4e2d\u3002\u63d2\u5165\u4f4d\u7f6e\u7531\u65e5\u5fd7\u5e8f\u5217\u53f7\uff08 LSN \uff09\u63cf\u8ff0\uff0c\u5b83\u662f WAL \u5185\u7684\u4e00\u4e2a\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u4f1a\u968f\u7740\u6bcf\u6761\u65b0\u8bb0\u5f55\u7684\u5199\u5165\u800c\u5355\u8c03\u9012\u589e\u3002 LSN \u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL 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\u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h 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\u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 \u5f00\u59cb\u3002\u8fd9\u4e9b\u7f16\u53f7\u4e0d\u4f1a\u56de\u7ed5\uff0c\u4f46\u8981\u628a\u53ef\u7528\u7684\u7f16\u53f7\u8017\u5c3d\u8fd8\u9700\u8981\u975e\u5e38\u3001\u975e\u5e38\u957f\u7684\u65f6\u95f4\u3002 \u5982\u679c\u80fd\u5c06 WAL \u653e\u5728\u4e0e\u4e3b\u6570\u636e\u5e93\u6587\u4ef6\u4e0d\u540c\u7684\u78c1\u76d8\u4e0a\uff0c\u4f1a\u66f4\u6709\u5229\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u628a pg_wal 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\u6587\u4ef6\u7684\u78c1\u76d8\u7a7a\u95f4\u9700\u6c42\uff0c\u5e76\u5b8c\u6210\u4efb\u4f55\u5fc5\u8981\u8c03\u4f18\u4e4b\u5916\uff0c\u4e0d\u9700\u8981\u518d\u505a\u5176\u4ed6\u64cd\u4f5c\uff08\u89c1 \u7b2c 30.5 \u8282 \uff09\u3002 \u6bcf\u5199\u5165\u4e00\u6761\u65b0\u8bb0\u5f55\uff0c WAL \u8bb0\u5f55\u5c31\u4f1a\u8ffd\u52a0\u5230 WAL \u6587\u4ef6\u4e2d\u3002\u63d2\u5165\u4f4d\u7f6e\u7531\u65e5\u5fd7\u5e8f\u5217\u53f7\uff08 LSN \uff09\u63cf\u8ff0\uff0c\u5b83\u662f WAL \u5185\u7684\u4e00\u4e2a\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u4f1a\u968f\u7740\u6bcf\u6761\u65b0\u8bb0\u5f55\u7684\u5199\u5165\u800c\u5355\u8c03\u9012\u589e\u3002 LSN \u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 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\u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h 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\u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 \u5f00\u59cb\u3002\u8fd9\u4e9b\u7f16\u53f7\u4e0d\u4f1a\u56de\u7ed5\uff0c\u4f46\u8981\u628a\u53ef\u7528\u7684\u7f16\u53f7\u8017\u5c3d\u8fd8\u9700\u8981\u975e\u5e38\u3001\u975e\u5e38\u957f\u7684\u65f6\u95f4\u3002 \u5982\u679c\u80fd\u5c06 WAL \u653e\u5728\u4e0e\u4e3b\u6570\u636e\u5e93\u6587\u4ef6\u4e0d\u540c\u7684\u78c1\u76d8\u4e0a\uff0c\u4f1a\u66f4\u6709\u5229\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u628a pg_wal 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\u6587\u4ef6\u7684\u78c1\u76d8\u7a7a\u95f4\u9700\u6c42\uff0c\u5e76\u5b8c\u6210\u4efb\u4f55\u5fc5\u8981\u8c03\u4f18\u4e4b\u5916\uff0c\u4e0d\u9700\u8981\u518d\u505a\u5176\u4ed6\u64cd\u4f5c\uff08\u89c1 \u7b2c 28.5 \u8282 \uff09\u3002 \u6bcf\u5199\u5165\u4e00\u6761\u65b0\u8bb0\u5f55\uff0c WAL \u8bb0\u5f55\u5c31\u4f1a\u8ffd\u52a0\u5230 WAL \u6587\u4ef6\u4e2d\u3002\u63d2\u5165\u4f4d\u7f6e\u7531\u65e5\u5fd7\u5e8f\u5217\u53f7\uff08 LSN \uff09\u63cf\u8ff0\uff0c\u5b83\u662f WAL \u5185\u7684\u4e00\u4e2a\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u4f1a\u968f\u7740\u6bcf\u6761\u65b0\u8bb0\u5f55\u7684\u5199\u5165\u800c\u5355\u8c03\u9012\u589e\u3002 LSN \u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 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\u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 \u5f00\u59cb\u3002\u8fd9\u4e9b\u7f16\u53f7\u4e0d\u4f1a\u56de\u7ed5\uff0c\u4f46\u8981\u628a\u53ef\u7528\u7684\u7f16\u53f7\u8017\u5c3d\u8fd8\u9700\u8981\u975e\u5e38\u3001\u975e\u5e38\u957f\u7684\u65f6\u95f4\u3002 \u5982\u679c\u80fd\u5c06 WAL \u653e\u5728\u4e0e\u4e3b\u6570\u636e\u5e93\u6587\u4ef6\u4e0d\u540c\u7684\u78c1\u76d8\u4e0a\uff0c\u4f1a\u66f4\u6709\u5229\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u628a pg_wal \u76ee\u5f55\u79fb\u52a8\u5230\u5176\u4ed6\u4f4d\u7f6e\uff08\u5f53\u7136\u8981\u5728\u670d\u52a1\u5668\u5173\u95ed\u65f6\u8fdb\u884c\uff09\uff0c\u7136\u540e\u5728\u4e3b\u6570\u636e\u76ee\u5f55\u4e2d\u7684\u539f\u4f4d\u7f6e\u521b\u5efa\u4e00\u4e2a\u6307\u5411\u65b0\u4f4d\u7f6e\u7684\u7b26\u53f7\u94fe\u63a5\u6765\u5b9e\u73b0\u3002"], "comparison_hash": 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\uff09\u63cf\u8ff0\uff0c\u5b83\u662f WAL \u5185\u7684\u4e00\u4e2a\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u4f1a\u968f\u7740\u6bcf\u6761\u65b0\u8bb0\u5f55\u7684\u5199\u5165\u800c\u5355\u8c03\u9012\u589e\u3002 LSN \u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 \u5f00\u59cb\u3002\u8fd9\u4e9b\u7f16\u53f7\u4e0d\u4f1a\u56de\u7ed5\uff0c\u4f46\u8981\u628a\u53ef\u7528\u7684\u7f16\u53f7\u8017\u5c3d\u8fd8\u9700\u8981\u975e\u5e38\u3001\u975e\u5e38\u957f\u7684\u65f6\u95f4\u3002 \u5982\u679c\u80fd\u5c06 WAL \u653e\u5728\u4e0e\u4e3b\u6570\u636e\u5e93\u6587\u4ef6\u4e0d\u540c\u7684\u78c1\u76d8\u4e0a\uff0c\u4f1a\u66f4\u6709\u5229\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u628a pg_wal 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\u6587\u4ef6\u7684\u78c1\u76d8\u7a7a\u95f4\u9700\u6c42\uff0c\u5e76\u5b8c\u6210\u4efb\u4f55\u5fc5\u8981\u8c03\u4f18\u4e4b\u5916\uff0c\u4e0d\u9700\u8981\u518d\u505a\u5176\u4ed6\u64cd\u4f5c\uff08\u89c1 \u7b2c 28.5 \u8282 \uff09\u3002 \u6bcf\u5199\u5165\u4e00\u6761\u65b0\u8bb0\u5f55\uff0c WAL \u8bb0\u5f55\u5c31\u4f1a\u8ffd\u52a0\u5230 WAL \u6587\u4ef6\u4e2d\u3002\u63d2\u5165\u4f4d\u7f6e\u7531\u65e5\u5fd7\u5e8f\u5217\u53f7\uff08 LSN \uff09\u63cf\u8ff0\uff0c\u5b83\u662f WAL \u5185\u7684\u4e00\u4e2a\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u4f1a\u968f\u7740\u6bcf\u6761\u65b0\u8bb0\u5f55\u7684\u5199\u5165\u800c\u5355\u8c03\u9012\u589e\u3002 LSN \u503c\u4ee5\u6570\u636e\u7c7b\u578b pg_lsn \u8fd4\u56de\u3002\u901a\u8fc7\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u53ef\u4ee5\u8ba1\u7b97\u5b83\u4eec\u4e4b\u95f4\u76f8\u9694\u7684 WAL \u6570\u636e\u91cf\uff0c\u56e0\u6b64\u5b83\u4eec\u53ef\u7528\u4e8e\u8861\u91cf\u590d\u5236\u548c\u6062\u590d\u7684\u8fdb\u5ea6\u3002 WAL \u6587\u4ef6\u4fdd\u5b58\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u7684 pg_wal \u76ee\u5f55\u4e2d\uff0c\u7531\u4e00\u7ec4\u6bb5\u6587\u4ef6\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u901a\u5e38\u4e3a 16 MB\uff08\u4e0d\u8fc7\u53ef\u901a\u8fc7\u4fee\u6539 --wal-segsize initdb \u9009\u9879\u6765\u6539\u53d8\u5927\u5c0f\uff09\u3002\u6bcf\u4e2a\u6bb5\u53c8\u5206\u4e3a\u82e5\u5e72\u9875\u9762\uff0c\u901a\u5e38\u6bcf\u9875 8 kB\uff08\u8be5\u5927\u5c0f\u53ef\u901a\u8fc7 configure \u9009\u9879 --with-wal-blocksize \u66f4\u6539\uff09\u3002WAL \u8bb0\u5f55\u5934\u5b9a\u4e49\u5728 access/xlogrecord.h \u4e2d\uff1b\u8bb0\u5f55\u5185\u5bb9\u5219\u53d6\u51b3\u4e8e\u88ab\u8bb0\u5f55\u7684\u4e8b\u4ef6\u7c7b\u578b\u3002\u6bb5\u6587\u4ef6\u4ee5\u4e0d\u65ad\u9012\u589e\u7684\u6570\u5b57\u547d\u540d\uff0c\u4ece 000000010000000000000001 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