PostgreSQL 7.1.3 Documentation
Prev | Chapter 3. System Catalogs | Next

# 3.9. pg_index

`pg_index` contains part of the information about indexes. The rest is mostly in `pg_class`.

Table 3-9. pg_index Columns

Name | Type | References | Description
--- | --- | --- | ---
indexrelid | `oid` | pg_class.oid | The oid of the pg_class entry for this index
indrelid | `oid` | pg_class.oid | The oid of the pg_class entry for the table this index is for
indproc | `oid` | pg_proc.oid | The registered procedure if this is a functional index
indkey | `int2vector` | pg_attribute.attnum | This is an vector (array) of up to INDEX_MAX_KEYS values that indicate which table columns this index pertains to. For example a value of `1 3` would mean that the first and the third column make up the index key.
indclass | `oidvector` | pg_opclass.oid | For each column in the index key this contains a reference to the "operator class" to use. See `pg_opclass` for details.
indisclustered | `bool` |  | unused
indislossy | `bool` |  | ???
indisunique | `bool` |  | If true, this is a unique index.
indisprimary | `bool` |  | If true, this index is a unique index that represents the primary key of the table.
indreference | `oid` |  | unused
indpred | `text` |  | Query plan for partial index predicate (not functional)

Prev | Home | Next
pg_group | Up | pg_inherits