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4.5 KiB
HTML
<!--$Id: log_stat.so,v 10.23 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: log_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>log_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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log_stat(DB_ENV *env,
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DB_LOG_STAT **spp, void *(*db_malloc)(size_t));
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</pre></h3>
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<h1>Description</h1>
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<p>The log_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 log region statistics are stored in a structure of type DB_LOG_STAT.
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The following DB_LOG_STAT fields will be filled in:
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<p><dl compact>
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<dt>u_int32_t st_magic;<dd>The magic number that identifies a file as a log file.
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<dt>u_int32_t st_version;<dd>The version of the log file type.
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<dt>u_int32_t st_regsize;<dd>The size of the region.
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<dt>int st_mode;<dd>The mode of any created log files.
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<dt>u_int32_t st_lg_bsize;<dd>The in-memory log record cache size.
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<dt>u_int32_t st_lg_max;<dd>The maximum size of any individual file comprising the log.
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<dt>u_int32_t st_w_mbytes;<dd>The number of megabytes written to this log.
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<dt>u_int32_t st_w_bytes;<dd>The number of bytes over and above <b>st_w_mbytes</b> written to this log.
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<dt>u_int32_t st_wc_mbytes;<dd>The number of megabytes written to this log since the last checkpoint.
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<dt>u_int32_t st_wc_bytes;<dd>The number of bytes over and above <b>st_wc_mbytes</b> written to this log
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since the last checkpoint.
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<dt>u_int32_t st_wcount;<dd>The number of times the log has been written to disk.
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<dt>u_int32_t st_wcount_fill;<dd>The number of times the log has been written to disk because the
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in-memory log record cache filled up.
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<dt>u_int32_t st_scount;<dd>The number of times the log has been flushed to disk.
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<dt>u_int32_t st_cur_file;<dd>The current log file number.
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<dt>u_int32_t st_cur_offset;<dd>The byte offset in the current log file.
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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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</dl>
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<p>The log_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 log_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 log_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_lg_bsize.html">DBENV->set_lg_bsize</a>,
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<a href="../api_c/env_set_lg_max.html">DBENV->set_lg_max</a>,
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<a href="../api_c/log_archive.html">log_archive</a>,
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<a href="../api_c/log_compare.html">log_compare</a>,
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<a href="../api_c/log_file.html">log_file</a>,
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<a href="../api_c/log_flush.html">log_flush</a>,
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<a href="../api_c/log_get.html">log_get</a>,
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<a href="../api_c/log_put.html">log_put</a>,
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<a href="../api_c/log_register.html">log_register</a>,
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<a href="../api_c/log_stat.html">log_stat</a>
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and
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<a href="../api_c/log_unregister.html">log_unregister</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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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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