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 51.87. pg_shadow Columns
| Column Type Description | 
|---|
| 
        User name | 
| 
        ID of this user | 
| 
        User can create databases | 
| 
        User is a superuser | 
| 
        User can initiate streaming replication and put the system in and out of backup mode. | 
| 
        User bypasses every row level security policy, see Section 5.8 for more information. | 
| 
        
       Password (possibly encrypted); null if none.  See
        | 
| 
        Password expiry time (only used for password authentication) | 
| 
        Session defaults for run-time configuration variables |