关于mysql的Unknown table engine ‘InnoDB’与安装 mysql innodb 插件

在创建测试分页表时，出现warnings，奇怪创建表怎么还出现warnings信息呢

mysql> create table test_fenye (uid bigint not null auto_increment, username varchar(30), primary key(uid) ) engine=innodb default charset=utf8;

Query OK, 0 rows affected, 2 warnings (0.01 sec)

查看warnings信息

mysql> show warnings;

+———+——+—————————————————-+

| Level | Code | Message |

+———+——+—————————————————-+

| Warning | 1286 | Unknown table engine ‘innodb’ |

| Warning | 1266 | Using storage engine MyISAM for table ‘test_fenye’ |

+———+——+—————————————————-+

2 rows in set (0.00 sec)

奇怪，怎么会Unknown table engine ‘innodb？查询资料，原来MySQL自5.1.*之后，InnoDB就已经不再内置，作为插件来安装了。下面进行InnoDB插件安装与配置

MySQL InnoDB插件安装与配置

如果你安装的时候忘记了添加innodb，又不想重新编辑mysql来添加，这样也没有关系，innodb就是一个插件，安装好mysql后也是可以添加的。

1.先查看MySQL是否安装了innodb插件

mysql> show plugin;

+————+——–+—————-+———+———+

| Name | Status | Type | Library | License |

+————+——–+—————-+———+———+

| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |

| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |

| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |

| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |

| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |

+————+——–+—————-+———+———+

2.安装InnoDB插件

mysql> install plugin innodb soname ‘ha_innodb.so’;

如果出现类似错误： ERROR 1126 (HY000): Can’t open shared library ‘/usr/local/mysql/lib/mysql/plugin/ha_innodb.so’ (errno: 13 cannot restore segment prot after reloc: Permission denied)

解决办法： chcon -t texrel_shlib_t /usr/local/mysql/lib/mysql/plugin/ha_innodb.so

3.修改MySQL配置文件/etc/my.cnf

# Uncomment the following if you are using InnoDB tables

innodb_data_home_dir = /usr/local/mysql/var/

innodb_data_file_path = ibdata1:10M:autoextend

innodb_log_group_home_dir = /usr/local/mysql/var/

# You can set .._buffer_pool_size up to 50 – 80 %

# of RAM but beware of setting memory usage too high

innodb_buffer_pool_size = 16M

innodb_additional_mem_pool_size = 2M

# Set .._log_file_size to 25 % of buffer pool size

innodb_log_file_size = 5M

innodb_log_buffer_size = 8M

innodb_flush_log_at_trx_commit = 1

innodb_lock_wait_timeout = 50

4.重启MySQL数据库

如果你想卸载innodb插件，你直接执行

uninstall plugin innodb;
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