Alibaba Cloud MySQL 5.7 installation and some major problems (total)

I accidentally downloaded MySQL 8.0 on the cloud server today, but because of compatibility, I don't want to use the higher version, so I plan to uninstall and clean up and then reinstall MySQL 57.Here are some of the content used:

Delete MySQL 8.0 that is being used and clean up the previous mysql content

rpm -qa | grep -i mysql

rpm -e??????(may be able to clean up the error)

Unable to clean up: RPM: error: db5 error(-30969)

What to do now:

Solution: Delete the rpm management database and rebuild it.The steps are as follows:

1. cd to the directory "/var/lib/rpm" to determine the database list and name:

root# cd /var/lib/rpm
root# ls -a
2. Delete "__db.001", "__db.002" and "__db.003":

root# rm -rf __db.*
3. Rebuild:

root# rpm --rebuilddb
4. This can be updated:

root# dnf update

Reprint the original link: https://blog.csdn.net/nipseven/article/details/118069230

find / -name mysql

# rm -rf ??????(clean up these mysql files)