# pg_tablespace

The `pg_tablespace` system catalog table 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 OushuDB system: there is only one copy of `pg_tablespace` per system, not one per database.

Table 1. `pg_catalog.pg_tablespace`

| column            | type      | references       | description                                                  |
| :---------------- | :-------- | :--------------- | :----------------------------------------------------------- |
| `spcname`         | name      |                  | Tablespace name.                                             |
| `spcowner`        | oid       | pg_authid.oid    | Owner of the tablespace, usually the user who created it.    |
| `spclocation`     | text[]    |                  | Deprecated.                                                  |
| `spcacl`          | aclitem[] |                  | Tablespace access privileges.                                |
| `spcprilocations` | text[]    |                  | Deprecated.                                                  |
| `spcmrilocations` | text[]    |                  | Deprecated.                                                  |
| `spcfsoid`        | oid       | pg_filespace.oid | The object id of the filespace used by this tablespace. A filespace defines directory locations on the master and segments. |