Test learning-104-clean uninstall mysql on Linux

Foreword:   

        mysql database is very commonly used, but sometimes different versions of upgrades, software upgrades, and different installation methods will be uninstalled. Unclean uninstallation will cause problems with the new version. Today I will talk about the complete clean uninstallation of mysql under Linux.

1. View the installation of mysql

rpm -qa|grep -i mysql

2. Stop the mysql service and delete the package

service mysql stop
rpm -ev MySQL-client-5.5.25a-1.rhel5  
rpm -ev MySQL-server-5.5.25a-1.rhel5

If you are prompted with a dependency package error, use the following command to try

rpm -ev MySQL-client-5.5.25a-1.rhel5 --nodeps  

If you get an error: error: %preun(xxxxxx) scriptlet failed, exit status 1
then try the following command:

rpm -e --noscripts MySQL-client-5.5.25a-1.rhel5  

3. Find the directory of the previous old version of mysql, and delete the files and libraries of the old version of mysql

whereis mysql

/var/lib/mysql
/var/lib/mysql/mysql
/usr/lib64/mysql

Delete the corresponding mysql directory

rm -rf /var/lib/mysql
rm -rf /var/lib/mysql
rm -rf /usr/lib64/mysql

Note: /etc/my.cnf will not be deleted after uninstallation, it needs to be deleted manually

rm -rf /etc/my.cnf  

4. Find again if the machine is installed with mysql

rpm -qa|grep -i mysql 

No result, indicating that it has been uninstalled completely