54.34. pg_user_mappings
 The view pg_user_mappings provides access to information about user mappings. This is essentially a publicly readable view of pg_user_mapping that leaves out the options field if the user has no rights to use it. 
Table 54.34. pg_user_mappings Columns
| Column Type Description | 
|---|
| 
 OID of the user mapping | 
| 
 The OID of the foreign server that contains this mapping | 
| 
 Name of the foreign server | 
| 
 OID of the local role being mapped, or zero if the user mapping is public | 
| 
 Name of the local user to be mapped | 
| 
 User mapping specific options, as “keyword=value” strings | 
 To protect password information stored as a user mapping option, the umoptions column will read as null unless one of the following applies: 
- current user is the user being mapped, and owns the server or holds - USAGEprivilege on it
- current user is the server owner and mapping is for - PUBLIC
- current user is a superuser