表空间传输

表空间传输实验

1.限制:

• 不能并发做表空间传输
• 不能有外健键

2.操作
-查看待表并执行'flush table @table-name for export'

root@localhost [wenyz]>show tables;
+-----------------+
| Tables_in_wenyz |
+-----------------+
| t2              |
+-----------------+
1 row in set (0.00 sec)

root@localhost [wenyz]>flush table t2 for export;
Query OK, 0 rows affected (0.01 sec)

• 复制t2.cfg和t2.cfg到tmp目录,并释放锁

#rm -rf t2.sql 
[root@db211_08:51:11 /tmp]  
#ll t2*
-rw-r----- 1 root root      431 Aug  2 08:35 t2.cfg
-rw-r----- 1 root root 14680064 Aug  2 08:35 t2.ibd
fg
root@localhost [wenyz]>unlock tables; //注意flush table * for export 是会加X锁的,等复制完之后需要释放

• 在目标数据库里需要有相同表结构的表,如果没有则创建一个一样的表.
• 释放创建时产生的t2.ibd(DISCARD TABLESPACE)

root@localhost [wenyz]>CREATE TABLE `t2` (   `id` int(10) unsigned NOT NULL AUTO_INCREMENT,   `ti` varchar(100) NOT NULL,   `date` date DEFAULT NULL,   PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4079879 DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.01 sec)

root@localhost [wenyz]>alter table t2 DISCARD TABLESPACE; //高危命令,注意执行前一定确认是在目标库里,执行此命令后此表原有数据将丢失.

• 将tmp目录下的t2.ibd和t2.cfg文件复制到/data/57mysql/mysql3506/data/wenyz/目录下

#cp /tmp/t2* .
[root@db211_08:58:36 /data/57mysql/mysql3506/data/wenyz]  
#ll
total 14356
-rw-r----- 1 mysql mysql       61 Aug  1 19:25 db.opt
-rw-r----- 1 root  root       431 Aug  2 08:58 t2.cfg
-rw-r----- 1 mysql mysql     8612 Aug  2 08:54 t2.frm
-rw-r----- 1 root  root  14680064 Aug  2 08:58 t2.ibd
[root@db211_08:58:37 /data/57mysql/mysql3506/data/wenyz]  

#chown mysql:mysql *  //记得修改权限
[root@db211_09:00:53 /data/57mysql/mysql3506/data/wenyz]  
#ll
total 14356
-rw-r----- 1 mysql mysql       61 Aug  1 19:25 db.opt
-rw-r----- 1 mysql mysql      431 Aug  2 08:58 t2.cfg
-rw-r----- 1 mysql mysql     8612 Aug  2 08:54 t2.frm
-rw-r----- 1 mysql mysql 14680064 Aug  2 08:58 t2.ibd

• 在mysql中导入新表空间
• 查看表数据

root@localhost [wenyz]>alter table t2 import tablespace;
Query OK, 0 rows affected (0.06 sec)

root@localhost [wenyz]>select count(*) from t2;
+----------+
| count(*) |
+----------+
|   163818 |
+----------+
1 row in set (0.08 sec)