MySQL FEDERATED 提示

在mysql的日志文件中有以下提示信息，该信息与federated引擎有关，就是在编译的时候加入了该选项，但是并没有在配置文件中加以启用，关于federated引擎，请参考mysql的官方参考文档。

http://dev.mysql.com/doc/refman/5.1/zh/storage-engines.html#federated-storage-engine

[root@170_DDB ~]# grep -i fed /home/mysql/data/10_ccs.err  

120814 13:50:42 [Note] Plugin 'FEDERATED' is disabled.
120814 13:53:49 [Note] Plugin 'FEDERATED' is disabled.
120814 14:42:52 [Note] Plugin 'FEDERATED' is disabled.

同时mysql中运行show engines显示信息如下：

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         |
| FEDERATED  | NO      | Federated MySQL storage engine                             | NULL         | NULL | NULL       |
| MyISAM     | YES     | Default engine as of MySQL 3.23 with great performance     | NO           | NO   | NO         |
| InnoDB     | DEFAULT | 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         |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
6 rows in set (0.01 sec)

在mysql的启动配置文件中添加选项：

[mysqld]
federated

重启mysql，再次查看日志，该提示信息不再出现

再次运行show engines显示信息如下：

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         |
| FEDERATED  | YES     | Federated MySQL storage engine                             | NO           | NO   | NO         |
| MyISAM     | YES     | Default engine as of MySQL 3.23 with great performance     | NO           | NO   | NO         |
| InnoDB     | DEFAULT | 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         |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
6 rows in set (0.00 sec)

从上面的信息中可以看出：已经可以支持FEDERATED了。

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