之前在centos6.4系统安装的是自带的mysql 5.1版本，后来升级到了5.6版本，执行以下命令报错
在网上查找原因说说因为升级不当导致，执行以下命令即可正常执行命令
mysql_upgrade -uroot -p123456
【转自】：https://www.cnblogs.com/xphdbky/p/7151923.html
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