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What is the context of the error message? Are you trying to export your own custom database? Or is this a message during a Plesk backup? Did you try to "check and repair" your database? Can you open the session table in phpMyAdmin?
Hello
Thank you for your reply.
That message appears because you can't update plesk.
I have already repartitioned all the databases of my sites and still can't update plesk.
Hello, could you provide database logs as well?
Also, it looks like the table 'session' is corrupted.
In this case, you can recover this table manually InnoDB Recovery Modes