51.87. 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 51.88. 
    
     pg_shadow
    
    Columns
   
  
| Name | Type | References | Description | 
|---|---|---|---|
       
        usename
       
       | 
      
       
        name
       
       | 
      
       
        
         
       | 
      User name | 
       
        usesysid
       
       | 
      
       
        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 |