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96 lines
4.9 KiB
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<!--$Id: txn_stat.so,v 10.27 2000/05/25 13:47:08 dda 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.txn_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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<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.txn_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 DbTxnStat txn_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.txn_stat method
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creates a DbTxnStat object encapsulating a statistical structure.
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The transaction region statistics are stored in a DbTxnStat object.
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The following data fields are available from the DbTxnStat 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 transaction region statistics are stored in a structure of type
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DB_TXN_STAT. The following DB_TXN_STAT fields will be filled in:
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<p><dl compact>
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<dt>public <a href="../api_java/lsn_class.html">DbLsn</a> st_last_ckp;<dd>The LSN of the last checkpoint.
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<dt>public <a href="../api_java/lsn_class.html">DbLsn</a> st_pending_ckp;<dd>The LSN of any checkpoint that is currently in progress. If
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<b>st_pending_ckp</b> is the same as <b>st_last_ckp</b> there
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is no checkpoint in progress.
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<dt>public long st_time_ckp;<dd>The time the last completed checkpoint finished (as the number of seconds
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since the Epoch, returned by the IEEE/ANSI Std 1003.1 (POSIX) <b>time</b> interface).
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<dt>public int st_last_txnid;<dd>The last transaction ID allocated.
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<dt>public int st_maxtxns;<dd>The maximum number of active transactions possible.
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<dt>public int st_nactive;<dd>The number of transactions that are currently active.
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<dt>public int st_maxnactive;<dd>The maximum number of active transactions at any one time.
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<dt>public int st_nbegins;<dd>The number of transactions that have begun.
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<dt>public int st_naborts;<dd>The number of transactions that have aborted.
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<dt>public int st_ncommits;<dd>The number of transactions that have committed.
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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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<dt>public Active st_txnarray[];<dd>The array of active transactions. Each element of the array is an object
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of type DbTxnStat.Active, a top level inner class, that has the following
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fields:
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<p><dl compact>
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<p><dt>public int txnid;<dd>The Transaction ID.
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<dt>public DbLsn lsn;<dd>The Lsn of the begin record.
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</dl>
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</dl>
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<p>The DbEnv.txn_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.txn_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.txn_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/txn_class.html">DbTxn</a>
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<h1>See Also</h1>
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<a href="../api_java/env_set_tx_max.html">DbEnv.set_tx_max</a>,
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<a href="../api_java/env_set_tx_timestamp.html">DbEnv.set_tx_timestamp</a>,
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<a href="../api_java/txn_abort.html">DbTxn.abort</a>,
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<a href="../api_java/txn_begin.html">DbEnv.txn_begin</a>,
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<a href="../api_java/txn_checkpoint.html">DbEnv.txn_checkpoint</a>,
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<a href="../api_java/txn_commit.html">DbTxn.commit</a>,
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<a href="../api_java/txn_id.html">DbTxn.id</a>,
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<a href="../api_java/txn_prepare.html">DbTxn.prepare</a>
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and
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<a href="../api_java/txn_stat.html">DbEnv.txn_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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