dmg 安装包

如果通过 dmg安装包 方式安装的Mysql，需要手动删除部分Mysql运行和配置文件，如下为删除相关文件的shell，可能不存在，但尽量查找并删除，避免出现一些莫名问题。

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sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
vim /etc/hostconfig  (and removed the line MYSQLCOM=-YES-)
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*

brew install

通过 brew install mysql 命令行方式安装的Mysql，可以运行如下命令删除Mysql:

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brew uninstall mysql
brew cleanup
launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
rm -Rf ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

reference:

How do you uninstall MySQL from Mac OS X?