MySQL InnoDB插件安装与配置
MySQL自5.1.*之后，InnoDB就已经不再内置，作为插件来安装了。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;
就可以了。
