Mamp 升级版本

mysql 备份所有数据库
/Applications/MAMP/Library/bin/mysqldump -uroot -p --all-databases> ./all.sql

升级重装后  连接出错 

报这个错误

Table 'performance_schema.session_variables' doesn't exist

/Applications/MAMP/Library/bin/mysql_upgrade -u root -p --force

即可成功