50.76. 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 50-77. 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 | |
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 5.7 for more information. | |
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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https://www.postgresql.org/docs/9.6/view-pg-shadow.html