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 48-54. pg_user_mapping Columns
|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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