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<h1 class="topictitle1">Lock wait timeouts</h1>



<div><p>Even if a transaction is not involved in a deadlock, it might have
to wait a considerable amount of time to obtain a lock because of a long-running
transaction or transactions holding locks on the tables it needs.</p>

<p>In such a situation, you might not want a transaction to wait indefinitely.
Instead, you might want the waiting transaction to abort, or <em>time out</em>,
after a reasonable amount of time, called a <em>lock wait timeout</em>.</p>

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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="cdevconcepts28436.html" title="In a database, a deadlock is a situation in which two or more transactions are waiting for one another to give up locks.">Deadlocks</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="cdevconcepts53677.html" title="Using both row-level locking and the TRANSACTION_READ_COMMITTED isolation level makes it likely that you will avoid deadlocks (both settings are Derby defaults). However, deadlocks are still possible.">Avoiding deadlocks</a></div>
<div><a href="cdevconcepts95005.html" title="When a transaction waits more than a specific amount of time to obtain a lock (called the deadlock timeout), Derby can detect whether the transaction is involved in a deadlock.">Deadlock detection</a></div>
<div><a href="cdevconcepts16400.html" title="You configure the amount of time a transaction waits before Derby does any deadlock checking with the derby.locks.deadlockTimeout property.">Configuring deadlock detection and lock wait timeouts</a></div>
<div><a href="cdevconcepts50894.html" title="If deadlocks occur frequently in your multi-user system with a particular application, you might need to do some debugging.">Debugging Deadlocks</a></div>
<div><a href="cdevconcepts32861.html" title="When you configure your system for deadlock and lockwait timeouts and an application could be chosen as a victim when the transaction times out, you should program your application to handle them.">Programming applications to handle deadlocks</a></div>
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