PostgreSQL 9.4.26 Documentation
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# 48.74. `pg_user_mappings`

The view `pg_user_mappings` provides access to information about user mappings. This is essentially a publicly readable view of `pg_user_mapping` that leaves out the options field if the user has no rights to use it.

Table 48-75. `pg_user_mappings` Columns

Name | Type | References | Description
--- | --- | --- | ---
`umid` | `oid` | ``pg_user_mapping`.oid` | OID of the user mapping
`srvid` | `oid` | ``pg_foreign_server`.oid` | The OID of the foreign server that contains this mapping
`srvname` | `name` | ``pg_foreign_server`.srvname` | Name of the foreign server
`umuser` | `oid` | ``pg_authid`.oid` | OID of the local role being mapped, 0 if the user mapping is public
`usename` | `name` |  | Name of the local user to be mapped
`umoptions` | `text[]` |  | User mapping specific options, as "keyword=value" strings

To protect password information stored as a user mapping option, the `umoptions` column will read as null unless one of the following applies:

- current user is the user being mapped, and owns the server or holds `USAGE` privilege on it

- current user is the server owner and mapping is for `PUBLIC`

- current user is a superuser

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