# 52.54. pg\_tablespace

系統目錄 pg\_tablespace 儲存有關可用資料表空間的訊息。可以將資料表放置在特定的資料表空間中以幫助管理磁碟規畫。

與大多數系統目錄不同，pg\_tablespace 在叢集的所有資料庫之間共享：每個叢集只有一個 pg\_tablespace 副本，而不是每個資料庫一個副本。

**Table 51.54. `pg_tablespace` 欄位**

| 名稱           | 型別          | 參考                                                                                   | 說明                                                                                                                                                     |
| ------------ | ----------- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `oid`        | `oid`       |                                                                                      | 資料列識別指標（隱藏屬性；必須明確選擇）                                                                                                                                   |
| `spcname`    | `name`      |                                                                                      | 資料表空間名稱                                                                                                                                                |
| `spcowner`   | `oid`       | [`pg_authid`](https://docs.postgresql.tw/11/internals/system-catalogs/pg_authid).oid | 資料表空間的所有者，通常是建立它的使用者                                                                                                                                   |
| `spcacl`     | `aclitem[]` |                                                                                      | 存取權限；詳情請參閱 [GRANT](https://docs.postgresql.tw/11/reference/sql-commands/grant) 和 [REVOKE](https://docs.postgresql.tw/11/reference/sql-commands/revoke) |
| `spcoptions` | `text[]`    |                                                                                      | 資料表空間的選項，為“keyword = value”字串                                                                                                                          |


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