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

roleidoidpg_authid.oidID of a role that has a member
memberoidpg_authid.oidID of a role that is a member of roleid
grantoroidpg_authid.oidID of the role that granted this membership
admin_optionbool True if member can grant membership in roleid to others