ERROR 1682 (HY000): Native table 'performance_schema'.'threads' has the wrong structure
MySQL 从5.5.20升级到5.6.21启动后报如下错误:[ERROR]Columncountofmysql.threadsiswrong.Expected14,found3.CreatedwithMySQL50520,nowrunning50621.Pleaseusemysql_upgradetofixthiserror.注意这里是报的错是mysql库中的threads表,实际上mysql库