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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
Thank you very much for your answer. I took up your suggestion and first removed all unnecessary databases. There was actually an older one with a corrupt index. After that the upgrade worked without any problems.
Unfortunately, I receive the following error message in the 3rd step of the wizard:
"Pre-upgrade checks
Analyzing databases with mysqlcheck"
Restarting MySQL server...
Running mysqlcheck...
/usr/bin/mysqlcheck: Got error: 2013: Lost connection to MySQL server during query when executing 'CHECK...