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My MySQL Database is Corrupted... What Do I Do Now?

Performing regular database backups is imperative for any production system. Usually when MySQL data gets corrupted, the recommendation is to restore it from the last backup, switch to DR server or take down the affected node down, if you have a cluster, to serve data immediately from other nodes. In some cases you can't - if the backup is not there, the cluster was never set up, your replication is down for a very long time, or the DR procedure was never tested.