11th October 2018: PostgreSQL 11 RC 1 Released!
Supported Versions: Current (10) / 9.6 / 9.5 / 9.4 / 9.3
Development Versions: 11 / devel
Unsupported versions: 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1

45.9. pg_auth_members

The catalog pg_auth_members shows the membership relations between roles. Any non-circular set of relationships is allowed.

Because user identities are cluster-wide, pg_auth_members is shared across all databases of a cluster: there is only one copy of pg_auth_members per cluster, not one per database.

Table 45-9. pg_auth_members Columns

Name Type References Description
roleid oid pg_authid.oid ID of a role that has a member
member oid pg_authid.oid ID of a role that is a member of roleid
grantor oid pg_authid.oid ID of the role that granted this membership
admin_option bool   True if member can grant membership in roleid to others