PostgreSQL 9.3.2 Documentation
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# 47.67. `pg_shadow`

The view `pg_shadow` exists for backwards compatibility: it emulates a catalog that existed in PostgreSQL before version 8.1. It shows properties of all roles that are marked as `rolcanlogin` in `pg_authid`.

The name stems from the fact that this table should not be readable by the public since it contains passwords. `pg_user` is a publicly readable view on `pg_shadow` that blanks out the password field.

Table 47-68. `pg_shadow` Columns

Name | Type | References | Description
--- | --- | --- | ---
`usename` | `name` | ``pg_authid`.rolname` | User name
`usesysid` | `oid` | ``pg_authid`.oid` | ID of this user
`usecreatedb` | `bool` |  | User can create databases
`usesuper` | `bool` |  | User is a superuser
`usecatupd` | `bool` |  | User can update system catalogs. (Even a superuser cannot do this unless this column is true.)
`userepl` | `bool` |  | User can initiate streaming replication and put the system in and out of backup mode.
`passwd` | `text` |  | Password (possibly encrypted); null if none. See `pg_authid` for details of how encrypted passwords are stored.
`valuntil` | `abstime` |  | Password expiry time (only used for password authentication)
`useconfig` | `text[]` |  | Session defaults for run-time configuration variables

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