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<!--$Id: log_stat.so,v 10.57 2005/10/28 19:45:34 bostic Exp $-->
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<title>Berkeley DB: DB_ENV->log_stat</title>
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<h3>DB_ENV->log_stat</h3>
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<h3><pre>
#include <db.h>
<p>
int
DB_ENV->log_stat(DB_ENV *env, DB_LOG_STAT **statp, u_int32_t flags);
<p>
int
DB_ENV->log_stat_print(DB_ENV *env, u_int32_t flags);
</pre></h3>
<hr size=1 noshade>
<h3>Description: DB_ENV->log_stat</h3>
<p>The DB_ENV->log_stat method returns the logging subsystem statistics.</p>
<p>The DB_ENV->log_stat method creates a statistical structure of type
DB_LOG_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="../api_c/env_set_alloc.html">DB_ENV->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_LOG_STAT fields will be filled in:</p>
<dl compact>
<dt>u_int32_t st_magic;<dd>The magic number that identifies a file as a log file.
<dt>u_int32_t st_version;<dd>The version of the log file type.
<dt>int st_mode;<dd>The mode of any created log files.
<dt>u_int32_t st_lg_bsize;<dd>The in-memory log record cache size.
<dt>u_int32_t st_lg_size;<dd>The log file size.
<dt>u_int32_t st_record;<dd>The number of records written to this log.
<dt>u_int32_t st_w_mbytes;<dd>The number of megabytes written to this log.
<dt>u_int32_t st_w_bytes;<dd>The number of bytes over and above <b>st_w_mbytes</b> written to this log.
<dt>u_int32_t st_wc_mbytes;<dd>The number of megabytes written to this log since the last checkpoint.
<dt>u_int32_t st_wc_bytes;<dd>The number of bytes over and above <b>st_wc_mbytes</b> written to this log
since the last checkpoint.
<dt>u_int32_t st_wcount;<dd>The number of times the log has been written to disk.
<dt>u_int32_t st_wcount_fill;<dd>The number of times the log has been written to disk because the
in-memory log record cache filled up.
<dt>u_int32_t st_rcount;<dd>The number of times the log has been read from disk.
<dt>u_int32_t st_scount;<dd>The number of times the log has been flushed to disk.
<dt>u_int32_t st_cur_file;<dd>The current log file number.
<dt>u_int32_t st_cur_offset;<dd>The byte offset in the current log file.
<dt>u_int32_t st_disk_file;<dd>The log file number of the last record known to be on disk.
<dt>u_int32_t st_disk_offset;<dd>The byte offset of the last record known to be on disk.
<dt>u_int32_t st_maxcommitperflush;<dd>The maximum number of commits contained in a single log flush.
<dt>u_int32_t st_mincommitperflush;<dd>The minimum number of commits contained in a single log flush that
contained a commit.
<dt>roff_t st_regsize;<dd>The size of the log region, in bytes.
<dt>u_int32_t st_region_wait;<dd>The number of times that a thread of control was forced to wait before
obtaining the log region mutex.
<dt>u_int32_t st_region_nowait;<dd>The number of times that a thread of control was able to obtain
the log region mutex without waiting.
</dl>
<p>The DB_ENV->log_stat method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>flags</b><dd>The <b>flags</b> parameter must be set to 0 or
the following value:
<dl compact>
<dt><a name="DB_STAT_CLEAR">DB_STAT_CLEAR</a><dd>Reset statistics after returning their values.
</dl>
<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 DB_ENV->log_stat method
may fail and return one of the following non-zero errors:</p>
<dl compact>
<dt>EINVAL<dd>An
invalid flag value or parameter was specified.
</dl>
<hr size=1 noshade>
<h3>Description: DB_ENV->log_stat_print</h3>
<p>The DB_ENV->log_stat_print method displays the
logging subsystem statistical information, as described for the DB_ENV->log_stat method.
The information is printed to a specified output channel (see the
<a href="../api_c/env_set_msgfile.html">DB_ENV->set_msgfile</a> method for more information), or passed to an
application callback function (see the <a href="../api_c/env_set_msgcall.html">DB_ENV->set_msgcall</a> method for
more information).</p>
<p>The DB_ENV->log_stat_print method may not be called before the <a href="../api_c/env_open.html">DB_ENV->open</a> method has
been called.</p>
<p>The DB_ENV->log_stat_print method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>flags</b><dd>The <b>flags</b> parameter must be set to 0 or
the following value:
<dl compact>
<dt><a name="DB_STAT_ALL">DB_STAT_ALL</a><dd>Display all available information.
</dl>
</dl>
<hr size=1 noshade>
<h3>Class</h3>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/logc_class.html">DB_LOGC</a>, <a href="../api_c/lsn_class.html">DB_LSN</a>
<h3>See Also</h3>
<a href="../api_c/log_list.html">Logging Subsystem and Related Methods</a>
</tt>
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