The pg_am table in the pg_catalog schema stores information about index access methods. There is one row for each index access method supported by the system.
| column | type | references | description |
|---|---|---|---|
oid | oid | Row identifier (hidden attribute; must be explicitly selected) | |
amname | name | Name of the access method | |
amhandler | regproc | OID of a handler function responsible for supplying information about the access method | |
amtype | char | t for table (including materialized views), i for index |
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