PostgreSQL 9.6.9 Documentation
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# 50.56. `pg_user_mapping`

The catalog `pg_user_mapping` stores the mappings from local user to remote. Access to this catalog is restricted from normal users, use the view `pg_user_mappings` instead.

Table 50-57. `pg_user_mapping` Columns

Name | Type | References | Description
--- | --- | --- | ---
`oid` | `oid` |  | Row identifier (hidden attribute; must be explicitly selected)
`umuser` | `oid` | ``pg_authid`.oid` | OID of the local role being mapped, 0 if the user mapping is public
`umserver` | `oid` | ``pg_foreign_server`.oid` | The OID of the foreign server that contains this mapping
`umoptions` | `text[]` |  | User mapping specific options, as "keyword=value" strings

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