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<h1>DbEnv.txn_stat</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
public DbTxnStat txn_stat(int flags)
throws DbException;
</pre></h3>
<h1>Description</h1>
<p>The DbEnv.txn_stat method returns the transaction 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.txn_stat method creates a DbTxnStat object encapsulating the
transaction region statistics. The following data fields are available
from the DbTxnStat object:
<p><dl compact>
<dt>public <a href="../api_java/lsn_class.html">DbLsn</a> st_last_ckp;<dd>The LSN of the last checkpoint.
<dt>public long st_time_ckp;<dd>The time the last completed checkpoint finished (as the number of seconds
since the Epoch, returned by the IEEE/ANSI Std 1003.1 (POSIX) <b>time</b> interface).
<dt>public int st_last_txnid;<dd>The last transaction ID allocated.
<dt>public int st_maxtxns;<dd>The maximum number of active transactions possible.
<dt>public int st_nactive;<dd>The number of transactions that are currently active.
<dt>public int st_maxnactive;<dd>The maximum number of active transactions at any one time.
<dt>public int st_nbegins;<dd>The number of transactions that have begun.
<dt>public int st_naborts;<dd>The number of transactions that have aborted.
<dt>public int st_ncommits;<dd>The number of transactions that have committed.
<dt>public int st_nrestores;<dd>The number of transactions that have been restored.
<dt>public int st_regsize;<dd>The size of the 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.
<dt>public Active st_txnarray[];<dd>The array of active transactions. Each element of the array is an object
of type DbTxnStat.Active, a top level inner class, that has the following
fields:
<p><dl compact>
<p><dt>public int txnid;<dd>The transaction ID of the transaction.
<dt>public int parentid;<dd>The transaction ID of the parent transaction (or 0, if no parent).
<dt>public <a href="../api_java/lsn_class.html">DbLsn</a> lsn;<dd>The current log sequence number when the transaction was begun.
</dl>
</dl>
<p>The DbEnv.txn_stat method throws an exception that encapsulates a non-zero error value on
failure.
<h1>Errors</h1>
<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.
If a catastrophic error has occurred, the DbEnv.txn_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/txn_class.html">DbTxn</a>
<h1>See Also</h1>
<a href="../api_java/txn_list.html">Transaction Subsystem and Related Methods</a>
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