Mysql默认存储引擎

此内容为转载，原版：https://blog.youkuaiyun.com/jswangchang/article/details/79419573

Mysql在V5.1之前默认存储引擎是MyISAM；在此之后默认存储引擎是InnoDB

查看默认存储引擎

查看当前mysql默认引擎: 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)

查看mysql支持哪些引擎：show engines;

Engine是引擎名字，

Support 显示Innodb是DEFAULT默认的；

Commnet是简单描述

Transactions： 是否支持事物

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)

修改默认存储引擎

如果修改本次会话的默认存储引擎(重启后失效)，只对本会话有效，其他会话无效：

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

修改全局会话默认存储引擎(重启后失效)，对所有会话有效

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

希望重启后也有效，即编辑/etc/my.cnf，[mysqld]下面任意位置添加配置；(所有对配置文件的修改，重启后生效)

default-storage-engine = InnoDB