在对mysql进行编译安装时，当安装完成后有时会发现不支持innodb存储引擎，这是因为编译安装时缺少支持innodb的参数：
--with-plugins=PLUGIN[,PLUGIN..]
Plugins to include in mysqld. (default is: none)
Must be a configuration name or a comma separated
list of plugins.
Available configurations are: none max max-no-ndb all.
Available plugins are: partition archive blackhole
csv example federated heap ibmdb2i innobase
innodb_plugin myisam myisammrg ndbcluster.
--with-plugins=innobase 或者--with-plugins=all #这是在5.5版本前
-DWITH_INNOBASE_STORAGE_ENGINE=1 #这是在5.5以后版本，用cmake编译时支持innodb所用的参数
然而，那些参数都是在编译时应选的，对现在的问题也于事无补；下面介绍如何添加innodb支持。 一.动态加载innodb 查看现在mysql到底是否支持innodb
mysql> show variables like "have_%";
+-------------------------+----------+
| Variable_name | Value |
+-------------------------+----------+
| have_community_features | YES |
| have_compress | YES |
| have_crypt | YES |
| have_csv | YES |
| have_dynamic_loading | YES |
| have_geometry | YES |
| have_innodb | NO |
| have_ndbcluster | NO |
| have_openssl | DISABLED |
| have_partitioning | NO |
| have_query_cache | YES |
| have_rtree_keys | YES |
| have_ssl | DISABLED |
| have_symlink | YES |
+-------------------------+----------+
14 rows in set (0.00 sec)
mysql> show plugins;
+------------+--------+----------------+---------+---------+
| 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 |
+------------+--------+----------------+---------+---------+
5 rows in set (0.01 sec)
#可见现在的mysql确实不支持innodb存储引擎
2.查看是否支持动态加载插件
mysql> show variables like "have_dynamic%";
+----------------------+-------+
| Variable_name | Value |
+----------------------+-------+
| have_dynamic_loading | YES |
+----------------------+-------+
1 row in set (0.00 sec)
#当现实为yes时表示支持动态加载mysql插件，该值一般为yes，当使用源码编译安装时不能使用–with-mysqld-ldflags=-all-static选项，以静态方式编译库，这样默认就会是yes。
3.放入插件文件
找到mysql存放插件的目录
mysql> show variables like 'plugin_dir';
+---------------+-----------------------------+
| Variable_name | Value |
+---------------+-----------------------------+
| plugin_dir | /opt/mysql/lib/mysql/plugin |
+---------------+-----------------------------+
1 row in set (0.00 sec)
#在该目录中查看是否已有ha_innodb.so和ha_innodb_plugin.so两个文件
[root@zhu2 mysql-5.1.39]# ll /opt/mysql/lib/mysql/plugin/ha_innodb.so
lrwxrwxrwx 1 mysql mysql 18 08-22 02:55 /opt/mysql/lib/mysql/plugin/ha_innodb.so -> ha_innodb.so.0.0.0
[root@zhu2 mysql-5.1.39]# ll /opt/mysql/lib/mysql/plugin/ha_innodb_plugin.so
lrwxrwxrwx 1 mysql mysql 25 08-22 02:55 /opt/mysql/lib/mysql/plugin/ha_innodb_plugin.so -> ha_innodb_plugin.so.0.0.0
#若没有可以去网上下载与所安装mysql对应的版本，或者直接去mysql源码包中storage/innobase/.libs/ha_innodb.so
storage/innodb_plugin/.libs/ha_innodb_plugin.so 复制到mysql的plugin目录中
4.添加动态安装加载
mysql> INSTALL PLUGIN InnoDB SONAME 'ha_innodb.so';
Query OK, 0 rows affected (0.61 sec)
5.查看现在是否支持innodb
mysql> show plugins;
+------------+--------+----------------+--------------+---------+
| 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 |
| InnoDB | ACTIVE | STORAGE ENGINE | ha_innodb.so | GPL |
+------------+--------+----------------+--------------+---------+
6 rows in set (0.01 sec)
mysql> show engines;
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| CSV | YES | CSV storage engine | 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 |
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
5 rows in set (0.01 sec)
二：追加编译 1.删除innodb支持，并查看
mysql> UNINSTALL PLUGIN innodb;
Query OK, 0 rows affected (0.52 sec)
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 |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO |
+------------+---------+-----------------------------------------------------------+--------------+------+------------+
4 rows in set (0.00 sec)
2.重新编译安装 。。。。。。
