The catalog pg_tablespace stores information
   about the available tablespaces.  Tables can be placed in particular
   tablespaces to aid administration of disk layout.
  
   Unlike most system catalogs, pg_tablespace
   is shared across all databases of a cluster: there is only one
   copy of pg_tablespace per cluster, not
   one per database.
  
Table 43-32. pg_tablespace Columns
| Name | Type | References | Description | 
|---|
| spcname | name |  | Tablespace name | 
| spcowner | oid | pg_authid.oid | Owner of the tablespace, usually the user who created it | 
| spclocation | text |  | Location (directory path) of the tablespace | 
| spcacl | aclitem[] |  | Access privileges; see
       GRANT and
       REVOKE
       for details |