pg_db_role_setting
   The catalog pg_db_role_setting records the default
   values that have been set for run-time configuration variables,
   for each role and database combination.
  
   Unlike most system catalogs, pg_db_role_setting
   is shared across all databases of a cluster: there is only one
   copy of pg_db_role_setting per cluster, not
   one per database.
  
Table 51.16. pg_db_role_setting Columns
| Column Type Description | 
|---|
| 
        The OID of the database the setting is applicable to, or zero if not database-specific | 
| 
        The OID of the role the setting is applicable to, or zero if not role-specific | 
| 
        Defaults for run-time configuration variables |