1.首先确定在mysql的’plugin_dir’下有ha_innodb_plugin.so和ha_innodb.so两个文件。查询’plugin_dir’的路径可以用以下命令

mysql> show variables like 'plugin_dir';
+---------------+-----------------------------------+
| Variable_name | Value |
+---------------+-----------------------------------+
| plugin_dir | /usr/local/mysql/lib/mysql/plugin |
+---------------+-----------------------------------+
1 row in set (0.01 sec)

2.如果没有找到，在您的mysql编译目录里有下面的目录文件(内置的innodb和innodb_plugin)

storage/innobase/.libs/ha_innodb.so
storage/innodb_plugin/.libs/ha_innodb_plugin.so

您需要把它们(ha_innodb_plugin.so和ha_innodb.so)拷贝到mysql的plugin目录中(/usr/local/mysql/lib/mysql/plugin)

3.接下来就是在mysql命令行安装一下

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 |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
4 rows in set (0.00 sec)
mysql> INSTALL PLUGIN InnoDB SONAME 'ha_innodb.so';
Query OK, 0 rows affected (0.69 sec)
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)

看到InnoDB并且为YES说明安装成功。