49.55. pg_tablespace
 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 49.55. pg_tablespace Columns
| Name | Type | References | Description | 
|---|---|---|---|
| oid | oid | Row identifier | |
| spcname | name | Tablespace name | |
| spcowner | oid |  | Owner of the tablespace, usually the user who created it | 
| spcacl | aclitem[] | Access privileges; see Section 5.7 for details | |
| spcoptions | text[] | Tablespace-level options, as “keyword=value” strings | 

