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