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.
pg_shadow ColumnsColumn Type
Description
usename name (references pg_authid.rolname)
User name
usesysid oid (references pg_authid.oid)
ID of this user
usecreatedb bool
User can create databases
usesuper bool
User is a superuser
userepl bool
User can initiate streaming replication and put the system in and out of backup mode.
usebypassrls bool
User bypasses every row-level security policy, see Section 5.8 for more information.
passwd text
Password (possibly encrypted); null if none. See pg_authid for details of how encrypted passwords are stored.
valuntil timestamptz
Password expiry time (only used for password authentication)
useconfig text[]
Session defaults for run-time configuration variables