Mysql 之 添加innodb支持

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
[[email protected] 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
[[email protected] 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
。。。。。。