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The server becomes slow (or unreachable) in the evening hour

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So, I did a server analysis and the first two things I noticed are:
- there are over 500 concurrent connections to the web server
- mysql uses a lot of CPU quota and over half of the available RAM
The Apache web server seems to handle the load well.
MySQL is instead in enormous suffering: the log file is huge (over 16G) and reports a series of warnings on a series of tables as if they were corrupt, so much so that it is suggested to run the "mysql_upgrade" command.
Obviously I didn't run it not knowing the system well.

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