mysql也有dblink哟，小姐姐，你没有听过吧，看小哥哥给你测试。
先看看mysql有哪些引擎，凯美瑞是双擎混动，mysql是10个引擎，并且还可以加
先看看mysql版本
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.16 |
+-----------+
1 row in set (0.00 sec)
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NO | NO | NO |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
这里我们用federated就是我们说的dblink类似的功能。远程映射。当前不支持。需要我们修改配置文件。
在/etc/my.cnf 添加
[mysqld]
federated
如下图
[root@slave02 ~]# more /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld]
federated
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
重启
[root@slave02 ~]# /etc/init.d/mysqld stop
Shutting down MySQL...... [ OK ]
[root@slave02 ~]# /etc/init.d/mysqld start
Starting MySQL.. [ OK ]
查看是否成功， YES
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| FEDERATED | YES | Federated MySQL storage engine | NO | NO | NO |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
下面看看，144主机没有ml_1， 然后建立142的映射（类似oracle dblink， 又类似sql server的透明网关）。
mysql> select count(*) from ml_1;
ERROR 1146 (42S02): Table 'iot.ml_1' doesn't exist
mysql>
mysql> create table ml_1(
-> id int
-> ,age int
-> ,school varchar(10)
-> ,city varchar(10)
-> ,memo varchar(50)
-> ) ENGINE=FEDERATED
-> CONNECTION='mysql://root:[email protected]:3306/job_admin/ml_1';
Query OK, 0 rows affected (0.12 sec)
mysql> select * from ml_1;
+------+------+--------+--------+--------------------------------------------+
| id | age | school | city | memo |
+------+------+--------+--------+--------------------------------------------+
| 7 | 31 | 本科 | 重庆 | 孟梁,数据库架构师,项目经理,团队管理2年,工作9年 |
+------+------+--------+--------+--------------------------------------------+
1 row in set (0.01 sec)
mysql>
--end--
---------------------
作者：老农民挖数据
来源：CSDN
原文：https://blog.csdn.net/shushugood/article/details/79925150
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