_PG_USER_MAPPINGS

Stores mappings from local users to remote users, as described in Table 1. Only the sysadmin user has the permission to view this view.

**Table 1** _PG_USER_MAPPINGS columns
Name	Type	Description
oid	oid	OID of the mapping from the local user to a remote user
umoptions	text[]	User mapping specific options, expressed in a string in the format of keyword=value.
umuser	oid	OID of the local user being mapped (0 if the user mapping is public).
authorization_identifier	information_schema.sql_identifier	Role of the local user.
foreign_server_catalog	information_schema.sql_identifier	Name of the database where the foreign server is located (always the current database)
foreign_server_name	information_schema.sql_identifier	Name of the foreign server.
srvowner	information_schema.sql_identifier	Owner of the foreign server.