Specify the name of a database on the target MySQL database server being monitored The port at which the specified host listens. Outputs of the test : One set of results for the target database server instance being monitored Configurable parameters for the test Parameter This test reports whether/not the deadlock detection is enabled and reports the count of deadlocks that occurred on the target MySQL database server.Īgent deploying the test : An internal/remote agent The MySQL Deadlocks test helps administrators in this regard! To avoid such wait time, administrators need to constantly keep a vigil on whether the deadlock detection is enabled or not. Though the transactions can be rolled back after the time specified against the innodb_lock_wait_timeout setting, administrators have to patiently wait for the roll back to happen. If deadlock detection is disabled, InnoDB relies on the innodb_lock_wait_timeout setting to roll back transactions in case of a deadlock. ![]() When deadlock detection is enabled (the default) and a deadlock does occur, InnoDB (the default MySQL Storage engine) detects the condition and rolls back one of the transactions. A deadlock can also occur when such statements lock ranges of index records and gaps, with each transaction acquiring some locks but not others due to a timing issue. ![]() A deadlock can occur when transactions lock rows in multiple tables (through statements such as UPDATE or SELECT. Because both transactions are waiting for a resource to become available, neither ever release the locks it holds. A deadlock is a situation where different transactions are unable to proceed because each holds a lock that the other needs.
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