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_PG_USER_MAPPINGS stores mappings from local users to remote users. 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 defined in
foreign_server_name information_schema.sql_identifier Name of the foreign server
srvowner information_schema.sql_identifier Owner of the foreign server