51.47. pg_role_password #
 The catalog pg_role_password records role's passwords history used to enforce authentication restrictions. 
 Unlike most system catalogs, pg_role_password is shared across all databases of a cluster: there is only one copy of pg_role_password per cluster, not one per database. 
Table 51.47. pg_role_password Columns
| Column Type Description | 
|---|
| 
 Password set time | 
| 
 The OID of the role | 
| 
 Password of the role (possibly encrypted) |