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<!--$Id: env_set_lk_detect.so,v 10.19 2000/12/08 20:43:15 bostic Exp $-->
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<h1>DbEnv.set_lk_detect</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
public void set_lk_detect(int detect)
throws DbException;
</pre></h3>
<h1>Description</h1>
<p>Set if the deadlock detector is to be run whenever a lock conflict occurs,
and specify which transaction should be aborted in the case of a deadlock.
The specified value must be one of the following list:
<p><dl compact>
<p><dt><a name="DB_LOCK_DEFAULT">DB_LOCK_DEFAULT</a><dd>Use the default policy as specified by <a href="../utility/db_deadlock.html">db_deadlock</a>.
<dt><a name="DB_LOCK_OLDEST">DB_LOCK_OLDEST</a><dd>Abort the oldest transaction.
<dt><a name="DB_LOCK_RANDOM">DB_LOCK_RANDOM</a><dd>Abort a random transaction involved in the deadlock.
<dt><a name="DB_LOCK_YOUNGEST">DB_LOCK_YOUNGEST</a><dd>Abort the youngest transaction.
</dl>
<p>The DbEnv.set_lk_detect interface may only be used to configure Berkeley DB before
the <a href="../api_java/env_open.html">DbEnv.open</a> interface is called.
<p>The DbEnv.set_lk_detect method throws an exception that encapsulates a non-zero error value on
failure.
<p>The database environment's deadlock detector configuration may also be set using the environment's
<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
single line with the string "set_lk_detect", one or more whitespace characters,
and the interface <b>detect</b> argument as a string, for example,
"set_lk_detect DB_LOCK_OLDEST". Because the <b>DB_CONFIG</b> file is read when the database
environment is opened, it will silently overrule configuration done
before that time.
<h1>Errors</h1>
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>Called after <a href="../api_java/env_open.html">DbEnv.open</a> was called.
</dl>
<h3>Classes</h3>
<a href="../api_java/dbenv_class.html">DbEnv</a>, <a href="../api_java/lock_class.html">DbLock</a>
<h1>See Also</h1>
<a href="../api_java/env_set_lk_conflicts.html">DbEnv.set_lk_conflicts</a>,
<a href="../api_java/env_set_lk_detect.html">DbEnv.set_lk_detect</a>,
<a href="../api_java/env_set_lk_max_locks.html">DbEnv.set_lk_max_locks</a>,
<a href="../api_java/env_set_lk_max_lockers.html">DbEnv.set_lk_max_lockers</a>,
<a href="../api_java/env_set_lk_max_objects.html">DbEnv.set_lk_max_objects</a>,
<a href="../api_java/env_set_lk_max.html">DbEnv.set_lk_max</a>,
<a href="../api_java/lock_detect.html">DbEnv.lock_detect</a>,
<a href="../api_java/lock_get.html">DbEnv.lock_get</a>,
<a href="../api_java/lock_id.html">DbEnv.lock_id</a>,
<a href="../api_java/lock_put.html">DbLock.put</a>
and
<a href="../api_java/lock_stat.html">DbEnv.lock_stat</a>.
</tt>
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