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4.9 KiB
HTML
<!--$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: 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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</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>txn_stat</h1>
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</td>
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<td width="1%">
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<a href="../api_c/c_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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#include <db.h>
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<p>
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int
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txn_stat(DB_ENV *env,
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DB_TXN_STAT **statp, void *(*db_malloc)(size_t));
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</pre></h3>
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<h1>Description</h1>
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<p>The txn_stat function
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creates a statistical structure and copies a pointer to it into a
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user-specified memory location.
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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><a href="../api_c/db_lsn.html">DB_LSN</a> st_last_ckp;<dd>The LSN of the last checkpoint.
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<dt><a href="../api_c/db_lsn.html">DB_LSN</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>time_t 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>u_int32_t st_last_txnid;<dd>The last transaction ID allocated.
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<dt>u_int32_t st_maxtxns;<dd>The maximum number of active transactions possible.
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<dt>u_int32_t st_nactive;<dd>The number of transactions that are currently active.
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<dt>u_int32_t st_maxnactive;<dd>The maximum number of active transactions at any one time.
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<dt>u_int32_t st_nbegins;<dd>The number of transactions that have begun.
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<dt>u_int32_t st_naborts;<dd>The number of transactions that have aborted.
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<dt>u_int32_t st_ncommits;<dd>The number of transactions that have committed.
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<dt>u_int32_t st_regsize;<dd>The size of the region.
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<dt>u_int32_t 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>u_int32_t 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>DB_TXN_ACTIVE * st_txnarray;<dd>A pointer to an array of <b>st_nactive</b> DB_TXN_ACTIVE structures,
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describing the currently active transactions. The following fields of
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the DB_TXN_ACTIVE structure will be filled in:
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<p><dl compact>
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<p><dt>u_int32_t txnid;<dd>The transaction ID as returned by <a href="../api_c/txn_begin.html">txn_begin</a>.
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<dt>u_int32_t parentid;<dd>The transaction ID of the parent transaction (or 0, if no parent).
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<dt><a href="../api_c/db_lsn.html">DB_LSN</a> lsn;<dd>The log sequence number of the transaction-begin record.
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</dl>
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</dl>
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<p>The txn_stat function returns a non-zero error value on failure and 0 on success.
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<h1>Errors</h1>
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<p>The txn_stat function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
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If a catastrophic error has occurred, the txn_stat function may fail and return
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<a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>, in which case all subsequent Berkeley DB calls will fail
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in the same way.
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<h1>See Also</h1>
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<a href="../api_c/env_set_tx_max.html">DBENV->set_tx_max</a>,
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<a href="../api_c/env_set_tx_recover.html">DBENV->set_tx_recover</a>,
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<a href="../api_c/env_set_tx_timestamp.html">DBENV->set_tx_timestamp</a>,
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<a href="../api_c/txn_abort.html">txn_abort</a>,
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<a href="../api_c/txn_begin.html">txn_begin</a>,
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<a href="../api_c/txn_checkpoint.html">txn_checkpoint</a>,
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<a href="../api_c/txn_commit.html">txn_commit</a>,
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<a href="../api_c/txn_id.html">txn_id</a>,
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<a href="../api_c/txn_prepare.html">txn_prepare</a>
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and
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<a href="../api_c/txn_stat.html">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_c/c_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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