PostgreSQL 9.3.2 Documentation
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# 47.9. `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 47-9. `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

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