![]() Break big transactions into smaller transactions keep it short to make them less prone to collision.There are many possibilities that can cause deadlocking situation, for simplicity I have grouped recommendations into 3 steps. ![]() I hope that this article will help clear such misconceptions.īack to the topic of this article. Deadlocks aren't dangerous, just retry failed transaction due to deadlock and follow the steps given below in this article. gap locking).ī) Small transactions are not affected by deadlocks - small transactions are less prone to deadlocks but it can still happen if transactions do not use the same order of operations.Ĭ) Deadlocks are dangerous - I still hear from some customers who are using MyISAM tables, their reason of not switching to InnoDB is a deadlock problem. ![]() However, if isolation level sets fewer locks, hence it can help avoid certain lock types (e.g. There are some misconceptions about deadlocks:Ī) Transaction isolation levels are responsible for deadlocks - The possibility of deadlocks is not affected by isolation level, it changes the behavior of read operations but deadlock occurs due to write operations. By default MySQL detects deadlock condition and to break the deadlock, it rolls back one of the transactions.Ī deadlock is a situation in which two or more transactions are waiting for one another to give up locks.įor a deadlock example, see InnoDB deadlocks Deadlocks are considered unwanted situation and it is a classic problem in all databases including MySQL/PostgreSQL/Oracle etc.
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