Mysql更换MyISAM存储引擎为Innodb的操作记录总结

一般情况下，mysql会默认提供多种存储引擎,可以通过下面的查看:

1）查看mysql是否安装了innodb插件。

通过下面的命令结果可知，已经安装了innodb插件。

mysql> show plugins; 
+------------+--------+----------------+---------+---------+ 
| name  | status | type   | library | license | 
+------------+--------+----------------+---------+---------+ 
| binlog  | active | storage engine | null | gpl  | 
| partition | active | storage engine | null | gpl  | 
| csv  | active | storage engine | null | gpl  | 
| memory  | active | storage engine | null | gpl  | 
| innodb  | active | storage engine | null | gpl  | 
| myisam  | active | storage engine | null | gpl  | 
| mrg_myisam | active | storage engine | null | gpl  | 
+------------+--------+----------------+---------+---------+ 
7 rows in set (0.00 sec)

----------------------------------------------------------------------
如果发现没有安装innodb插件,可以执行下面语句进行安装：
mysql> install plugin innodb soname 'ha_innodb.so';
----------------------------------------------------------------------

2）查看mysql现在已提供什么存储引擎:

mysql> show engines; 
+------------+---------+------------------------------------------------------------+--------------+------+------------+ 
| engine  | support | comment             | transactions | xa | savepoints | 
+------------+---------+------------------------------------------------------------+--------------+------+------------+ 
| mrg_myisam | yes  | collection of identical myisam tables      | no   | no | no   | 
| csv  | yes  | csv storage engine           | no   | no | no   | 
| myisam  | default | default engine as of mysql 3.23 with great performance  | no   | no | no   | 
| innodb  | yes  | supports transactions, row-level locking, and foreign keys | yes   | yes | yes  | 
| memory  | yes  | hash based, stored in memory, useful for temporary tables | no   | no | no   | 
+------------+---------+------------------------------------------------------------+--------------+------+------------+ 
5 rows in set (0.00 sec)

3）查看mysql当前默认的存储引擎:

mysql> show variables like '%storage_engine%'; 
+----------------+--------+ 
| variable_name | value | 
+----------------+--------+ 
| storage_engine | myisam | 
+----------------+--------+ 
1 row in set (0.00 sec) 

4）看某个表用了什么引擎(在显示结果里参数engine后面的就表示该表当前用的存储引擎):

mysql> show create table 表名;

mysql> show create table wx_share_log; 
+--------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| table  | create table                                                                          | 
+--------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| wx_share_log | create table `wx_share_log` ( 
 `id` int(11) not null auto_increment comment '微信分享日志自增id', 
 `reference_id` int(11) not null comment '推荐的经纪人id', 
 `create_time` datetime not null comment '创建时间', 
 primary key (`id`) 
) engine=myisam auto_increment=13 default charset=utf8     | 
+--------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
1 row in set (0.00 sec) 

5）如何将myisam库导成innodb引擎格式的:

在备份出的xxx.sql文件中把engine=myisam全换成engine=innodb
再次导入就可以了。

6）转换表的命令:

mysql> alter table 表名 engine=innodb;

有上面可以查到看，本机mysql使用的存储引擎是默认的myisan，由于业务需要，先要将其存储引擎改为innodb。

操作记录如下：

1）以安全模式关闭mysql

[root@dev mysql5.1.57]# mysqladmin -uroot -p shutdown
enter password:
[root@dev mysql5.1.57]# ps -ef|grep mysql

2）备份my.cnf

[root@dev mysql5.1.57]# cp my.cnf my.cnf.old

3）修改my.cnf配置文件

[root@dev mysql5.1.57]# vim my.cnf
.....
[mysqld]                                        //在这个配置区域添加下面一行，指定存储引擎为innodb
default-storage-engine = innodb

4）删除/mysql/data目录下的ib_logfile0，ib_logfile1。删除或剪切到别处都行。

[root@dev var]# mv ib_logfile0 ib_logfile1 /tmp/back/

5）启动mysql，登陆mysql验证存储引擎是否已切换

[root@dev var]# /data/app/mysql5.1.57/bin/mysqld_safe --defaults-file=/data/app/mysql5.1.57/my.cnf &

mysql> show variables like '%storage_engine%'; 
+----------------+--------+ 
| variable_name | value | 
+----------------+--------+ 
| storage_engine | innodb | 
+----------------+--------+ 
1 row in set (0.00 sec) 

以上这篇mysql更换myisam存储引擎为innodb的操作记录总结就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。