PostgreSQL 7.2.1 Documentation
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# 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 | `regproc` | pg_proc.oid | The registered procedure if this is a functional index
indkey | `int2vector` | pg_attribute.attnum | This is a 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
indisunique | `bool` |  | If true, this is a unique index.
indisprimary | `bool` |  | If true, this index represents the primary key of the table. (indisunique should always be true when this is true.)
indreference | `oid` |  | unused
indpred | `text` |  | Expression tree (in the form of a nodeToString representation) for partial index predicate

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