PostgreSQL 9.6beta4 Documentation
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# 49.3. `pg_am`

The catalog `pg_am` stores information about index access methods. There is one row for each index access method supported by the system. The requirements for index access methods are discussed in detail in Chapter 58.

Table 49-3. `pg_am` Columns

Name | Type | References | Description
--- | --- | --- | ---
`oid` | `oid` |  | Row identifier (hidden attribute; must be explicitly selected)
`amname` | `name` |  | Name of the access method
`amhandler` | `oid` | ``pg_proc`.oid` | OID of a handler function that is responsible for supplying information about the access method

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