Mysql在V5.1之前預設儲存引擎是MyISAM；在此之後預設儲存引擎是InnoDB

檢視預設儲存引擎

檢視當前mysql預設引擎: show variables like '%engine%';

mysql> show variables like '%engine%';
+----------------------------------+--------+
| Variable_name                    | Value  |
+----------------------------------+--------+
| default_storage_engine 
 
          | InnoDB |
| default_tmp_storage_engine       | InnoDB |
| disabled_storage_engines         |        |
| internal_tmp_disk_storage_engine | InnoDB |
+----------------------------------+--------+
4 rows in set (0.00 sec)

檢視mysql支援哪些引擎：show engines;

Engine是引擎名字，

Support 顯示Innodb是DEFAULT預設的；

Commnet是簡單描述

Transactions： 是否支援事物

mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine             | Support | Comment                                                        | Transactions | XA   | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| CSV                | YES     | CSV storage engine                                             | NO           | NO   | NO         |
| MRG_MYISAM         | YES     | Collection of identical MyISAM tables                          | NO           | NO   | NO         |
| MyISAM             | YES     | MyISAM storage engine                                          | NO           | NO   | NO         |
| BLACKHOLE          | YES     | /dev/null storage engine (anything you write to it disappears) | NO           | NO   | NO         |
| PERFORMANCE_SCHEMA | YES     | Performance Schema                                             | NO           | NO   | NO         |
| MEMORY             | YES     | Hash based, stored in memory, useful for temporary tables      | NO           | NO   | NO         |
| ARCHIVE            | YES     | Archive storage engine                                         | NO           | NO   | NO         |
| InnoDB             | DEFAULT | Supports transactions, row-level locking, and foreign keys     | YES          | YES  | YES    
 
    |
| FEDERATED          | NO      | Federated MySQL storage engine                                 | NULL         | NULL | NULL       |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)

修改預設儲存引擎

如果修改本次會話的預設儲存引擎(重啟後失效)，只對本會話有效，其他會話無效：

mysql> set default_storage_engine=innodb;
Query OK, 0 rows affected (0.00 sec)

修改全域性會話預設儲存引擎(重啟後失效)，對所有會話有效

mysql> set global default_storage_engine=innodb;
Query OK, 0 rows affected (0.00 sec)

希望重啟後也有效，即編輯/etc/my.cnf，[mysqld]下面任意位置新增配置；(所有對配置檔案的修改，重啟後生效)

default-storage-engine = InnoDB