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 42-9. 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 may grant membership in
roleid to others |