http://zhangxugg-163-com.iteye.com/blog/1666673FEDERATED
Storage Engine Notes and Tips： http://dev.mysql.com/doc/refman/5.7/en/federated-usagenotes.html
Federated引擎是基于表级别的，只能将本地数据表定义为 Federated 引擎并映射至远程实体表，无法实现基于库级别的整体映射。
进入MYSQL命令行，查看FEDERATED引擎是否开启，默认是不开启
>show engines;
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+-----+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+-----+------------+
| FEDERATED | YES | Federated MySQL storage engine | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
+--------------------+---------+----------------------------------------------------------------+--------------+-----+------------+
9 rows in set
如果没有开启，配置my.cnf
[mysqld] feterated
重启
在远程机192.168.32.128上创建数据库log，创建表test，如下：
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for test
-- ----------------------------
DROP TABLE IF EXISTS `test`;
CREATE TABLE "test" (
"id" int(11) NOT NULL AUTO_INCREMENT,
"name" varchar(255) DEFAULT NULL,
PRIMARY KEY ("id")
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
创建用户，授予权限
FLUSH PRIVILEGES; CREATE USER 'donald'@'%' IDENTIFIED BY '123456'; GRANT ALL PRIVILEGES ON *.* TO 'donald'@'%' IDENTIFIED BY '123456'; FLUSH PRIVILEGES;
在本地创建相应的表：
-- ----------------------------
-- Table structure for test
-- ----------------------------
DROP TABLE IF EXISTS `test`;
CREATE TABLE "test" (
"id" int(11) NOT NULL AUTO_INCREMENT,
"name" varchar(255) DEFAULT NULL,
PRIMARY KEY ("id")
) ENGINE=FEDERATED CONNECTION='mysql://donald:[email protected]:3306/log/test';
插入数据：
INSERT INTO `log`.`test` (`id`, `name`) VALUES ('1', 'donald');
INSERT INTO `log`.`test` (`id`, `name`) VALUES ('2', 'jamel');
查询数据：
mysql> use test;
Database changed
mysql> select * from test;
+----+--------+
| id | name |
+----+--------+
| 1 | donald |
| 2 | jamel |
+----+--------+