MySQL - SHOW ENGINES 语句

MySQL SHOW ENGINES 语句

SHOW ENGINES 语句返回 MySQL 存储引擎的当前状态信息。它显示以下详细信息 -

• Engine - 引擎名称

• Support - 支持类型，可以是 YES、DEFAULT、NO 和 DISABLED。

• Comment - 引擎描述

• Transactions - 一个布尔值，指定引擎是否支持事务。

• XA - 一个布尔值，指定引擎是否支持 XA 事务。

• Savepoints - 一个布尔值，指定引擎是否支持保存点。

语法

以下是 MySQL SHOW ENGINES 语句−

SHOW [STORAGE] ENGINES

示例

您可以使用 SHOW ENGINES 语句检索有关引擎的信息，如下所示 −

SHOW ENGINES\G;

输出

以下是上述查询的输出 -

*************** 1. row ***************
      Engine: MEMORY
     Support: YES
     Comment: Hash based, stored in memory, useful for temporary tables
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 2. row ***************
      Engine: MRG_MYISAM
     Support: YES
     Comment: Collection of identical MyISAM tables
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 3. row ***************
      Engine: CSV
     Support: YES
     Comment: CSV storage engine
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 4. row ***************
      Engine: FEDERATED
     Support: NO
     Comment: Federated MySQL storage engine
Transactions: NULL
          XA: NULL
  Savepoints: NULL
*************** 5. row ***************
      Engine: PERFORMANCE_SCHEMA
     Support: YES
     Comment: Performance Schema
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 6. row ***************
      Engine: MyISAM
     Support: YES
     Comment: MyISAM storage engine
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 7. row ***************
      Engine: InnoDB
     Support: DEFAULT
     Comment: Supports transactions, row-level locking, and foreign keys
Transactions: YES
          XA: YES
  Savepoints: YES
*************** 8. row ***************
      Engine: BLACKHOLE
     Support: YES
     Comment: /dev/null storage engine (anything you write to it disappears)
Transactions: NO
          XA: NO
  Savepoints: NO
*************** 9. row ***************
      Engine: ARCHIVE
     Support: YES
     Comment: Archive storage engine
Transactions: NO
          XA: NO
  Savepoints: NO

9 rows in set (0.00 sec)

示例

您也可以在语句中间指定 STORAGE，如下所示:

SHOW STORAGE ENGINES;

输出

上述查询产生以下输出 -