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Does MySQL always detects the deadlocks automatically? Or the are some situations when MySQL just can’t figure out that it’s dealing with deadlock?
According to the docs, MyISAM, a table-level locking storage engine, is deadlock-free.
InnoDB has deadlock detection.
NDB detection is implemented through a timeout. You can set the TransactionDeadlockDetectionTimeout parameter for transactions.
So, whether its with roll backs or timeouts, the deadlock will eventually recover.