<!--$Id: txn_stat.so,v 10.55 2003/11/27 02:15:22 bostic Exp $--> <!--Copyright 1997-2003 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::txn_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> <h3>DbEnv::txn_stat</h3> </td> <td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a> <a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db_cxx.h> <p> int DbEnv::txn_stat(DB_TXN_STAT **statp, u_int32_t flags); </pre></h3> <hr size=1 noshade> <h3>Description: DbEnv::txn_stat</h3> <p>The DbEnv::txn_stat method returns the transaction subsystem statistics.</p> <p>The DbEnv::txn_stat method creates a statistical structure of type DB_TXN_STAT and copies a pointer to it into a user-specified memory location.</p> <p>Statistical structures are stored in allocated memory. If application-specific allocation routines have been declared (see <a href="../../db42-devel-4.2.52/api_cxx/env_set_alloc.html">DbEnv::set_alloc</a> for more information), they are used to allocate the memory; otherwise, the standard C library <b>malloc</b>(3) is used. The caller is responsible for deallocating the memory. To deallocate the memory, free the memory reference; references inside the returned memory need not be individually freed.</p> <p>The following DB_TXN_STAT fields will be filled in:</p> <p><dl compact> <dt>DbLsn st_last_ckp;<dd>The LSN of the last checkpoint. <dt>time_t 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> function). <dt>u_int32_t st_last_txnid;<dd>The last transaction ID allocated. <dt>u_int32_t st_maxtxns;<dd>The maximum number of active transactions configured. <dt>u_int32_t st_nactive;<dd>The number of transactions that are currently active. <dt>u_int32_t st_maxnactive;<dd>The maximum number of active transactions at any one time. <dt>u_int32_t st_nbegins;<dd>The number of transactions that have begun. <dt>u_int32_t st_naborts;<dd>The number of transactions that have aborted. <dt>u_int32_t st_ncommits;<dd>The number of transactions that have committed. <dt>u_int32_t st_nrestores;<dd>The number of transactions that have been restored. <dt>u_int32_t st_regsize;<dd>The size of the region. <dt>u_int32_t st_region_wait;<dd>The number of times that a thread of control was forced to wait before obtaining the region lock. <dt>u_int32_t st_region_nowait;<dd>The number of times that a thread of control was able to obtain the region lock without waiting. <dt>DB_TXN_ACTIVE *st_txnarray;<dd>A pointer to an array of <b>st_nactive</b> DB_TXN_ACTIVE structures, describing the currently active transactions. The following fields of the DB_TXN_ACTIVE structure will be filled in: <p><dl compact> <dt>u_int32_t txnid;<dd>The transaction ID of the transaction. <dt>u_int32_t parentid;<dd>The transaction ID of the parent transaction (or 0, if no parent). <dt>DbLsn lsn;<dd>The current log sequence number when the transaction was begun. <dt>u_int32_t xa_status;<dd>If the transaction is an XA transaction, the status of the transaction, otherwise 0. <dt>u_int8_t xid[DB_XIDDATASIZE];<dd>If the transaction is an XA transaction, the transaction's XA ID. </dl> </dl> <p>The DbEnv::txn_stat method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </p> <h3>Parameters</h3> <p><dl compact> <p><dt><b>flags</b><dd> The <b>flags</b> parameter must be set to 0 or the following value: <p><dl compact> <p><dt><a name="DB_STAT_CLEAR">DB_STAT_CLEAR</a><dd>Reset statistics after returning their values. </dl> <p><dt><b>statp</b><dd> The <b>statp</b> parameter references memory into which a pointer to the allocated statistics structure is copied. </dl> <h3>Errors</h3> <p>The DbEnv::txn_stat method may fail and throw <a href="../../db42-devel-4.2.52/api_cxx/except_class.html">DbException</a>, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:</p> <p><dl compact> <p><dt>EINVAL<dd>An invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db42-devel-4.2.52/api_cxx/env_class.html">DbEnv</a>, <a href="../../db42-devel-4.2.52/api_cxx/txn_class.html">DbTxn</a> <h3>See Also</h3> <a href="../../db42-devel-4.2.52/api_cxx/txn_list.html">Transaction Subsystem and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db42-devel-4.2.52/api_cxx/api_index.html"><img src="../../db42-4.2.52/images/api.gif" alt="API"></a><a href="../../db42-devel-4.2.52/ref/toc.html"><img src="../../db42-4.2.52/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="../../db42-devel-4.2.52/sleepycat/legal.html">Copyright (c) 1996-2003</a> <a href="http://www.sleepycat.com">Sleepycat Software, Inc.</a> - All rights reserved.</font> </body> </html>
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