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<title>derby.locks.deadlockTrace</title>
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<h1 class="topictitle1">derby.locks.deadlockTrace</h1>

<div>
<div class="section"><h4 class="sectiontitle">Function</h4>
<p>Causes a detailed list of locks at the time of a deadlock or a timeout
to be written to the error log (typically the file <em>derby.log</em>). For a
deadlock, <span>Derby</span> describes the
cycle of locks which caused the deadlock. For a timeout,
<span>Derby</span> prints the entire lock
list at the time of the timeout. This property is meaningful only if the
<em><a href="rrefproper98166.html#rrefproper98166">derby.locks.monitor</a></em>
property is set to <em>true</em>.</p>

<div class="note"><span class="notetitle">Note: </span>This level of debugging is intrusive: it can alter
the timing of the application, reduce performance severely, and produce a
large error log file. It should be used with care.</div>

</div>

<div class="section"><h4 class="sectiontitle">Default</h4>
<p>False.</p>

</div>

<div class="example"><h4 class="sectiontitle">Example</h4>
<pre><strong>-- system property
derby.locks.deadlockTrace=true

CALL SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY(
    'derby.locks.deadlockTrace', 'true')</strong></pre>

</div>

<div class="section"><h4 class="sectiontitle">Dynamic or static</h4>
<p>Dynamic; the change takes effect immediately. For information about dynamic
changes to properties, see
<a href="crefproperdynstat.html#crefproperdynstat">Dynamic and static properties</a>.</p>

</div>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="crefproper22250.html" title="The Derby properties are used for configuring the system and database, as well as for diagnostics such as logging statements, and monitoring and tracing locks.">Derby properties</a></div>
</div>
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