mysql 诡异报错 Table 'performance_schema.session_variables' doesn't exist

https://stackoverflow.com/questions/31967527/table-performance-schema-session-variables-doesnt-exist

要升级，嫌弃比较麻烦，我按照

mysql -u xxx -p
mysql> set @@global.show_compatibility_56=ON;

就好了~~完美