<!--$Id: lock_stat.html,v 1.1 2003/02/15 04:55:53 zarzycki Exp $--> <!--Copyright 1997-2002 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv.lock_stat</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>DbEnv.lock_stat</h1> </td> <td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> import com.sleepycat.db.*; <p> public DbLockStat lock_stat(int flags) throws DbException; </pre></h3> <h1>Description</h1> <p>The DbEnv.lock_stat method returns the locking subsystem statistics. <p>The <b>flags</b> value must be set to 0 or the following value: <p><dl compact> <p><dt><a name="Db.DB_STAT_CLEAR">Db.DB_STAT_CLEAR</a><dd>Reset statistics after returning their values. </dl> <p>The DbEnv.lock_stat method creates a DbLockStat object encapsulating the lock region statistics. The following data fields are available from the DbLockStat object: <p><dl compact> <dt>public int st_id;<dd>The last allocated locker ID. <dt>public int st_cur_maxid;<dd>The current maximum unused locker ID. <dt>public int st_nmodes;<dd>The number of lock modes. <dt>public int st_maxlocks;<dd>The maximum number of locks possible. <dt>public int st_maxlockers;<dd>The maximum number of lockers possible. <dt>public int st_maxobjects;<dd>The maximum number of lock objects possible. <dt>public int st_nlocks;<dd>The number of current locks. <dt>public int st_maxnlocks;<dd>The maximum number of locks at any one time. <dt>public int st_nlockers;<dd>The number of current lockers. <dt>public int st_maxnlockers;<dd>The maximum number of lockers at any one time. <dt>public int st_nobjects;<dd>The number of current lock objects. <dt>public int st_maxnobjects;<dd>The maximum number of lock objects at any one time. <dt>public int st_nrequests;<dd>The total number of locks requested. <dt>public int st_nreleases;<dd>The total number of locks released. <dt>public int st_nnowaits;<dd>The total number of lock requests failing because <a href="../api_java/lock_vec.html#DB_LOCK_NOWAIT">Db.DB_LOCK_NOWAIT</a> was set. <dt>public int st_nconflicts;<dd>The total number of locks not immediately available due to conflicts. <dt>public int st_ndeadlocks;<dd>The number of deadlocks. <dt>public int st_locktimeout;<dd>Lock timeout value. <dt>public int st_nlocktimeouts;<dd>The number of locks that have timed out. <dt>public int st_txntimeout;<dd>Transaction timeout value. <dt>public int st_ntxntimeouts;<dd>The number of transactions that have timed out. This value is also a component of <b>st_ndeadlocks</b>, the total number of deadlocks detected. <dt>public int st_regsize;<dd>The size of the lock region. <dt>public int st_region_wait;<dd>The number of times that a thread of control was forced to wait before obtaining the region lock. <dt>public int st_region_nowait;<dd>The number of times that a thread of control was able to obtain the region lock without waiting. </dl> <p>The DbEnv.lock_stat method throws an exception that encapsulates a non-zero error value on failure. <h1>Errors</h1> <p>The DbEnv.lock_stat method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.lock_stat method may fail and throw a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls will fail in the same way. <h1>Class</h1> <a href="../api_java/env_class.html">DbEnv</a>, <a href="../api_java/lock_class.html">DbLock</a> <h1>See Also</h1> <a href="../api_java/lock_list.html">Locking Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_java/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>