## 41.15. `pg_group`

The catalog `pg_group` defines groups and stores what users belong to what groups. Groups are created with the `CREATE GROUP` command. Consult Chapter 17, Database Users and Privileges for information about user privilege management.

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

Table 41.15. `pg_group` Columns

Name | Type | References | Description
--- | --- | --- | ---
`groname` | `name` |  | Name of the group
`grosysid` | `int4` |  | An arbitrary number to identify this group
`grolist` | `int4[]` | ``pg_shadow`.usesysid` | An array containing the IDs of the users in this group