pg_index

字段

PostgreSQL 18 的 21 个字段，按定义顺序排列。说明默认用本站手册的译文，没有译文的按英文原文显示。

演化历史

相邻两个大版本之间的差异，新的在前。版本号链到该版的字段表。

1. PostgreSQL 15 ← 14 结构变更

   +indnullsnotdistinct

   1 处描述更新

   • indkey This is an array of indnatts values that indicate which table columns this index indexes. For example a value of 1 3 would mean that the first and the third table columns make up the index entries. Key columns come before non-key (included) columns. A zero in this array indicates that the corresponding index attribute is an expression over the table columns, rather than a simple column reference. This is an array of indnatts values that indicate which table columns this index indexes. For example, a value of 1 3 would mean that the first and the third table columns make up the index entries. Key columns come before non-key (included) columns. A zero in this array indicates that the corresponding index attribute is an expression over the table columns, rather than a simple column reference.

2. PostgreSQL 11 ← 10 结构变更

   +indnkeyatts

   5 处描述更新

   • indclass For each column in the index key, this contains the OID of the operator class to use. See pg_opclass for details. For each column in the index key (indnkeyatts values), this contains the OID of the operator class to use. See pg_opclass for details.
   • indcollation For each column in the index key, this contains the OID of the collation to use for the index, or zero if the column is not of a collatable data type. For each column in the index key (indnkeyatts values), this contains the OID of the collation to use for the index, or zero if the column is not of a collatable data type.
   • indkey This is an array of indnatts values that indicate which table columns this index indexes. For example a value of 1 3 would mean that the first and the third table columns make up the index key. A zero in this array indicates that the corresponding index attribute is an expression over the table columns, rather than a simple column reference. This is an array of indnatts values that indicate which table columns this index indexes. For example a value of 1 3 would mean that the first and the third table columns make up the index entries. Key columns come before non-key (included) columns. A zero in this array indicates that the corresponding index attribute is an expression over the table columns, rather than a simple column reference.
   • indnatts The number of columns in the index (duplicates pg_class.relnatts) The total number of columns in the index (duplicates pg_class.relnatts); this number includes both key and included attributes
   • indoption This is an array of indnatts values that store per-column flag bits. The meaning of the bits is defined by the index's access method. This is an array of indnkeyatts values that store per-column flag bits. The meaning of the bits is defined by the index's access method.

3. PostgreSQL 10 ← 9.6 仅描述更新

   2 处描述更新

   • indcollation For each column in the index key, this contains the OID of the collation to use for the index. For each column in the index key, this contains the OID of the collation to use for the index, or zero if the column is not of a collatable data type.
   • indisreplident If true this index has been chosen as "replica identity" using ALTER TABLE ... REPLICA IDENTITY USING INDEX ... If true this index has been chosen as “replica identity” using ALTER TABLE ... REPLICA IDENTITY USING INDEX ...

4. PostgreSQL 9.4 ← 9.3 结构变更

   +indisreplident

5. PostgreSQL 9.3 ← 9.2 结构变更

   +indislive

   1 处描述更新

   • indisvalid If both this flag and indisready are true, the index is currently valid for queries. False means the index is possibly incomplete: it must still be modified by INSERT/UPDATE operations, but it cannot safely be used for queries. If it is unique, the uniqueness property is not guaranteed true either. If true, the index is currently valid for queries. False means the index is possibly incomplete: it must still be modified by INSERT/UPDATE operations, but it cannot safely be used for queries. If it is unique, the uniqueness property is not guaranteed true either.

6. PostgreSQL 9.2 ← 9.1 仅描述更新

   1 处描述更新

   • indisvalid If true, the index is currently valid for queries. False means the index is possibly incomplete: it must still be modified by INSERT/UPDATE operations, but it cannot safely be used for queries. If it is unique, the uniqueness property is not true either. If both this flag and indisready are true, the index is currently valid for queries. False means the index is possibly incomplete: it must still be modified by INSERT/UPDATE operations, but it cannot safely be used for queries. If it is unique, the uniqueness property is not guaranteed true either.

7. PostgreSQL 9.1 ← 9.0 结构变更

   +indisexclusion+indcollation indexprs：text → pg_node_treeindpred：text → pg_node_tree

   1 处描述更新

   • indimmediate If true, the uniqueness check is enforced immediately on insertion (indisunique should always be true when this is true) If true, the uniqueness check is enforced immediately on insertion (irrelevant if indisunique is not true)

字段矩阵

每个字段在 18 个收录版本里的存在情况；方格指向该版的字段表。「有变」指类型、可空、隐式或数组维数与上一版不同。

存在 有变 已移除 不存在

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