实施例

Question

我有mysql 5.1.44

mysql> show engines;
+------------+---------+
| Engine     | Support | 
+------------+---------+
| ndbcluster | NO      | 
| MRG_MYISAM | YES     | 
| BLACKHOLE  | YES     | 
| CSV        | YES     | 
| MEMORY     | YES     | 
| FEDERATED  | NO      | 
| ARCHIVE    | YES     | 
| InnoDB     | YES     | 
| MyISAM     | DEFAULT |

现在，我需要在mysql中启用联合引擎，我该怎么办？

Answer 1

编辑/etc/my.cnf并在[mysqld]部分中添加以下行：

federated

它相当于在命令行中指定--federated

Answer 2

我知道帖子有点陈旧，但似乎很多人都遇到了联邦引擎的问题。

当通过yum安装mysql二进制文件时，您已经拥有HA（高可用性）插件。您只需要在mysql CLI中加载插件。

以下是基本流程：

如果尚未启动mysqld，请启动它。确保此时“联合”不在/etc/my.cnf中。

EX：此时，/ etc / my.cnf将从标准的YUM安装中看起来像这样......

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

使用root（或具有足够权限的其他帐户）登录mysql CLI。

Type:   show engines;

此时您应该看不到FEDERATED引擎，如下所示：

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)

- ＆GT; END PASTE＆lt; -

要启用联盟引擎，请键入以下内容：

install plugin federated soname 'ha_federated.so'

现在，当你'显示引擎'时，你会看到FEDERATED引擎，但是关闭......

看起来像这样：


    mysql> show engines;
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    | Engine     | Support | Comment                                                    | Transactions | XA   | Savepoints |
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    | FEDERATED  | NO      | Federated MySQL storage engine                             | NULL         | NULL | NULL       |
    | 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         |
   | MRG_MYISAM | YES     | Collection of identical MyISAM tables                      | NO           | NO   | NO         |
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    6 rows in set (0.00 sec)

您现在可以安全地将“联合”行添加到/etc/my.cnf文件中，如下所示：


    [mysqld]
    datadir=/var/lib/mysql
    socket=/var/lib/mysql/mysql.sock
    user=mysql
    # Disabling symbolic-links is recommended to prevent assorted security risks
    symbolic-links=0
    federated

    [mysqld_safe]
    log-error=/var/log/mysqld.log
    pid-file=/var/run/mysqld/mysqld.pid

重启mysqld（服务mysqld restart等等）

重启后，返回mysql CLI。

Type 'show engines;'

您现在应该看到FEDERATED引擎可用，并且SUPPORT为YES。


    mysql> show engines;
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    | Engine     | Support | Comment                                                    | Transactions | XA   | Savepoints |
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    | FEDERATED  | YES     | Federated MySQL storage engine                             | 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         |
    | MRG_MYISAM | YES     | Collection of identical MyISAM tables                      | NO           | NO   | NO         |
    +------------+---------+------------------------------------------------------------+--------------+------+------------+
    6 rows in set (0.00 sec)

你完成了......出去创建联邦表......

祝你好运！

Answer 3

从MySQL 5.0.64开始， FEDERATED存储引擎不是在运行中默认启用服务器;要启用FEDERATED，你必须使用启动MySQL服务器二进制文件 --federated选项。 - MySQL Documentation

要在配置文件中使用--federated option，请删除--。

实施例

的my.cnf

[mysqld]
federated

Answer 4

我正在Workbench中尝试Foward Engineer，这个错误向我显示，所以我的解决方案是Workbench->加载模型-> Mysql模型->在显示错误的表中单击，然后单击Edit。只需将Engine更改为InnoDB。

MYSQL 8

如何在安装后在mysql中启用联合引擎？

4 个答案:

实施例