[MySQL] Can't create database 'performance_schema'

在執行完 MySQL upgrade 後就炸掉了...

/etc/mysql/debian-start[4802]: ERROR 1007 (HY000) at line 160: Can't create database 'performance_schema'; database exists

修正方式 ：

# rm -rf /var/lib/mysql/performance_schema
# mysql_upgrade -u root -p