Last_Errno: 1396
Last_Error: Error ‘Operation CREATE USER failed for ‘usera63‘@‘%‘‘ on query. Default database: ‘ucenter‘. Query: ‘create user usera63‘
原因：从数据库已经存在该用户
解决：
drop user ‘usera63‘@‘%‘
stop slave;
start slave;
Last_Errno: 1396
原文：http://www.cnblogs.com/liang545621/p/7518409.html
