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4.9 KiB
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<!--$Id: lock_stat.so,v 10.30 2000/12/08 20:43:15 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv.lock_stat</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>DbEnv.lock_stat</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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public DbLockStat lock_stat()
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throws DbException;
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</pre></h3>
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<h1>Description</h1>
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<p>The DbEnv.lock_stat method
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creates a DbLockStat object encapsulating a statistical structure.
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The lock region statistics are stored in a DbLockStat object.
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The following data fields are available from the DbLockStat object:
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<p>Statistical structures are created in allocated memory. If <b>db_malloc</b> is non-NULL, it
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is called to allocate the memory, otherwise, the library function
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<b>malloc</b>(3) is used. The function <b>db_malloc</b> must match
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the calling conventions of the <b>malloc</b>(3) library routine.
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Regardless, the caller is responsible for deallocating the returned
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memory. To deallocate returned memory, free the returned memory
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reference, references inside the returned memory do not need to be
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individually freed.
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<p>The lock region statistics are stored in a structure of type
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DB_LOCK_STAT. The following DB_LOCK_STAT fields will be filled in:
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<p><dl compact>
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<dt>public int st_lastid;<dd>The last allocated lock ID.
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<dt>public int st_nmodes;<dd>The number of lock modes.
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<dt>public int st_maxlocks;<dd>The maximum number of locks possible.
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<dt>public int st_maxlockers;<dd>The maximum number of lockers possible.
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<dt>public int st_maxobjects;<dd>The maximum number of objects possible.
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<dt>public int st_nlocks;<dd>The number of current locks.
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<dt>public int st_maxnlocks;<dd>The maximum number of locks at any one time.
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<dt>public int st_nlockers;<dd>The number of current lockers.
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<dt>public int st_maxnlockers;<dd>The maximum number of lockers at any one time.
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<dt>public int st_nobjects;<dd>The number of current objects.
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<dt>public int st_maxnobjects;<dd>The maximum number of objects at any one time.
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<dt>public int st_nrequests;<dd>The total number of locks requested.
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<dt>public int st_nreleases;<dd>The total number of locks released.
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<dt>public int st_nnowaits;<dd>The total number of lock requests that failed because
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<a href="../api_java/lock_vec.html#DB_LOCK_NOWAIT">Db.DB_LOCK_NOWAIT</a> was set.
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<dt>public int st_nconflicts;<dd>The total number of locks not immediately available due to conflicts.
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<dt>public int st_ndeadlocks;<dd>The number of deadlocks detected.
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<dt>public int st_regsize;<dd>The size of the region.
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<dt>public int st_region_wait;<dd>The number of times that a thread of control was forced to wait before
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obtaining the region lock.
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<dt>public int st_region_nowait;<dd>The number of times that a thread of control was able to obtain
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the region lock without waiting.
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</dl>
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<p>The DbEnv.lock_stat method throws an exception that encapsulates a non-zero error value on
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failure.
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<h1>Errors</h1>
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<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.
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If a catastrophic error has occurred, the DbEnv.lock_stat method may fail and throw
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a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
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will fail in the same way.
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<h3>Classes</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>, <a href="../api_java/lock_class.html">DbLock</a>
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<h1>See Also</h1>
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<a href="../api_java/env_set_lk_conflicts.html">DbEnv.set_lk_conflicts</a>,
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<a href="../api_java/env_set_lk_detect.html">DbEnv.set_lk_detect</a>,
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<a href="../api_java/env_set_lk_max_locks.html">DbEnv.set_lk_max_locks</a>,
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<a href="../api_java/env_set_lk_max_lockers.html">DbEnv.set_lk_max_lockers</a>,
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<a href="../api_java/env_set_lk_max_objects.html">DbEnv.set_lk_max_objects</a>,
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<a href="../api_java/env_set_lk_max.html">DbEnv.set_lk_max</a>,
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<a href="../api_java/lock_detect.html">DbEnv.lock_detect</a>,
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<a href="../api_java/lock_get.html">DbEnv.lock_get</a>,
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<a href="../api_java/lock_id.html">DbEnv.lock_id</a>,
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<a href="../api_java/lock_put.html">DbLock.put</a>
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and
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<a href="../api_java/lock_stat.html">DbEnv.lock_stat</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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