Last_Errno: 1396

從庫報錯：
Last_Errno: 1396
                   Last_Error: Error 'Operation RENAME USER failed for 'maxscalemon'@'192.168.4.0'' on query. Default database: ''. Query: 'RENAME USER 'maxscalemon'@'192.168.4.0' TO 'maxscalemon'@'192.168.4.%''


解決：
從庫上：
/etc/init.d/mysql stop
cd /home/mysql/data/
mkdir /mnt/data
mv * /mnt/data/


把主庫的
cd /home/mysql/data/
mysql performance_schema  scp過來從庫上的/home/mysql/data/裏面
從庫上
chown mysql.mysql -R /home/mysql/data/
/etc/init.d/mysql start