本文主要描述一个报错场景：主库是5.5，使用xtrabackup备份后，恢复出来一个从库，然后从库的版本是5.6 ， 5.6从库 错误日志频繁报错。
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作者：张正
blog：http://space.itpub.net/26355921
QQ：176036317
如有疑问，欢迎联系。
| 7f00e2777700 InnoDB: Error: Table "mysql"."innodb_table_stats" not found. 7f00e2777700 InnoDB: Recalculation of persistent statistics requested for table "xxx"."xxx" but the required persistent statistics storage is not present or is corrupted. Using transient stats instead. |
| [Warning] Info table is not ready to be used. Table 'mysql.slave_worker_info' cannot be opened [ERROR] Could not delete from Slave Workers info repository. |
1、使用mysql_upgrade将数据文件升级，具体方法参照：
http://blog.itpub.net/26355921/viewspace-2126568/
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