The pg_user_mappings view provides access to information about user mappings. This view is essentially a public-readble view of the pg_user_mapping system catalog table that omits the options field if the user does not have access rights to view it.
|umid||oid||pg_user_mapping.oid||OID of the user mapping.|
|srvid||oid||pg_foreign_server.oid||OID of the foreign server that contains this mapping.|
|srvname||text||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 reads as null unless one of the following applies:
- The current user is the user being mapped, and owns the server or holds USAGE privilege on it.
- The current user is the server owner and the mapping is for PUBLIC.
- The current user is a superuser.