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PG_INDEX

Updated on 2024-05-07 GMT+08:00

PG_INDEX records part of index information. The rest is mostly recorded in PG_CLASS.

Table 1 PG_INDEX columns

Name

Type

Description

indexrelid

oid

OID of 13.2.53 PG_CLASS for the index.

indrelid

oid

OID of 13.2.53 PG_CLASS for the table that uses the index.

indnatts

smallint

Number of columns in the index.

indisunique

Boolean

Specifies whether the index is unique.

  • true: The index is unique.
  • false: The index is not unique.

indisprimary

Boolean

Specifies whether the index is the primary key of the table.

  • true: The index is the primary key of the table. indisunique should always be true when the value of this column is true.
  • false: The index is not the primary key of the table.

indisexclusion

Boolean

Specifies whether the index supports exclusive constraints.

  • true: The index supports exclusive constraints.
  • false: The index does not support exclusive constraints.

indimmediate

Boolean

Specifies whether to perform the uniqueness check immediately when data is inserted

  • true: The uniqueness check is performed immediately when data is inserted.
  • false: The uniqueness check is not performed when data is inserted.

indisclustered

Boolean

Specifies whether the table is clustered on the index.

  • true: The table is clustered on the index.
  • false: The table is not clustered on the index.

indisusable

Boolean

Specifies whether the index is available for insert and select operations.

  • true: The index is available for insert and select operations.
  • false: The index is unavailable for insert and select operations.

indisvalid

Boolean

  • true: The index can be used for query.
  • false: The index is possibly incomplete and must still be modified by INSERT or UPDATE operations, but it cannot be securely used for queries. If it is a unique index, the uniqueness property is also not true.

indcheckxmin

Boolean

  • true: Queries must not use the index until the xmin of this row in PG_INDEX is lower than their TransactionXmin, because the table may contain broken HOT chains with incompatible rows that they can see.
  • false: Indexes can be used for query.

indisready

Boolean

  • true: The index is available for inserting data.
  • false: The index is ignored when data is inserted or modified.

indkey

int2vector

This is an array of indnatts values indicating that this index creates table columns. For example, a value of 1 3 indicates that the first and the third columns make up the index key. The value 0 in this array indicates that the corresponding index attribute is an expression over the table columns, rather than a simple column reference.

indcollation

oidvector

OID of the collation corresponding to each index column. For details, see PG_COLLATION.

indclass

oidvector

For each column in the index key, this contains the OID of the operator class to use. See PG_OPCLASS for details.

indoption

int2vector

Array of values that store per-column flag bits. The meaning of the bits is defined by the index's access method.

indexprs

pg_node_tree

Expression trees (in nodeToString() representation) for index attributes that are not simple column references. It is a list with one element for each zero entry in indkey. The value is null if all index attributes are simple references.

indpred

pg_node_tree

Expression tree (in nodeToString() representation) for partial index predicate. If the index is not a partial index, this column is an empty string.

indisreplident

Boolean

Specifies whether the column of this index is a decoded column of logical decoding.

  • true: The column of this index is a decoded column of logical decoding.
  • false: The column of this index is not a decoded column of logical decoding.

indnkeyatts

smallint

Total number of columns in the index. The columns that exceed the value of indnatts are not involved in the index query.

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