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420 lines
15 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DB_ENV->log_stat()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="lsn.html" title="Chapter 7. The DB_LSN Handle" />
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<link rel="prev" href="envlog_set_config.html" title="DB_ENV->log_set_config()" />
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<link rel="next" href="logstat_print.html" title="DB_ENV->log_stat_print()" />
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB_ENV->log_stat()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envlog_set_config.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7.
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The DB_LSN Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="logstat_print.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="logstat"></a>DB_ENV->log_stat()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB_ENV->log_stat(DB_ENV *env, DB_LOG_STAT **statp, u_int32_t flags); </pre>
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<p>
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The <code class="methodname">DB_ENV->log_stat()</code> method returns the logging subsystem
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statistics.
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</p>
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<p>
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The <code class="methodname">DB_ENV->log_stat()</code> method creates a statistical structure of type
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<code class="literal">DB_LOG_STAT</code> and copies a pointer to it into a user-specified memory
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location.
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</p>
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<p>
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Statistical structures are stored in allocated memory. If
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application-specific allocation routines have been declared (see
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<a class="xref" href="envset_alloc.html" title="DB_ENV->set_alloc()">DB_ENV->set_alloc()</a>
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for more information), they are used to allocate the memory;
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otherwise, the standard C library <span class="bold"><strong>malloc</strong></span>(3) is used. The caller is responsible
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for deallocating the memory. To deallocate the memory, free the
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memory reference; references inside the returned memory need not be
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individually freed.
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</p>
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<p>
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The following <code class="literal">DB_LOG_STAT</code> fields will be filled in:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_cur_file;</strong></span>
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</p>
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<p>
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The current log file number.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_cur_offset;</strong></span>
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</p>
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<p>
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The byte offset in the current log file.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_disk_file;</strong></span>
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</p>
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<p>
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The log file number of the last record known to be on disk.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_disk_offset;</strong></span>
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</p>
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<p>
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The byte offset of the last record known to be on disk.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_fileid_init;</strong></span>
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</p>
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<p>
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The initial allocated file logging identifiers.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_lg_bsize;</strong></span>
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</p>
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<p>
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The in-memory log record cache size.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_lg_size;</strong></span>
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</p>
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<p>
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The log file size.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_magic;</strong></span>
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</p>
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<p>
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The magic number that identifies a file as a log file.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_maxcommitperflush;</strong></span>
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</p>
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<p>
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The maximum number of commits contained in a single log flush.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_maxnfileid;</strong></span>
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</p>
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<p>
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The maximum number of file logging identifiers
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used.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_mincommitperflush;</strong></span>
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</p>
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<p>
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The minimum number of commits contained in a single log flush that
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contained a commit.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>int st_mode;</strong></span>
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</p>
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<p>
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The mode of any created log files.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_nfileid;</strong></span>
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</p>
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<p>
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The current number of file logging identifiers.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_rcount;</strong></span>
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</p>
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<p>
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The number of times the log has been read from disk.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_record;</strong></span>
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</p>
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<p>
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The number of records written to this log.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>roff_t st_regsize;</strong></span>
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</p>
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<p>
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The region size, in bytes.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_region_wait;</strong></span>
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</p>
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<p>
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The number of times that a thread of control was forced to wait before
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obtaining the log region mutex.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_region_nowait;</strong></span>
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</p>
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<p>
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The number of times that a thread of control was able to obtain the
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log region mutex without waiting.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_scount;</strong></span>
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</p>
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<p>
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The number of times the log has been flushed to disk.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_version;</strong></span>
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</p>
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<p>
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The version of the log file type.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_w_bytes;</strong></span>
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</p>
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<p>
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The number of bytes over and above <span class="bold"><strong>st_w_mbytes</strong></span> written to this log.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_w_mbytes;</strong></span>
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</p>
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<p>
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The number of megabytes written to this log.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_wc_bytes;</strong></span>
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</p>
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<p>
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The number of bytes over and above <span class="bold"><strong>st_wc_mbytes</strong></span> written to this log since the last
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checkpoint.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>u_int32_t st_wc_mbytes;</strong></span>
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</p>
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<p>
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The number of megabytes written to this log since the last checkpoint.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_wcount_fill;</strong></span>
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</p>
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<p>
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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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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>uintmax_t st_wcount;</strong></span>
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</p>
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<p>
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The number of times the log has been written to disk.
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</p>
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</li>
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</ul>
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</div>
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<p>
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The <code class="methodname">DB_ENV->log_stat()</code> method may not be called before the
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<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method is called.
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</p>
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<p>
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The <code class="methodname">DB_ENV->log_stat()</code> <span>
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<span>
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method returns a non-zero error value on failure and 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3729795"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3729634"></a>statp</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>statp</strong></span> parameter references memory
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into which a pointer to the allocated statistics structure is copied.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3729872"></a>flags</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
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or the following value:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p><a id="logstat_DB_STAT_CLEAR"></a>
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<code class="literal">DB_STAT_CLEAR</code>
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</p>
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<p>
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Reset statistics after returning their values.
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</p>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3729956"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DB_ENV->log_stat()</code> <span>
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<span>
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method may fail and return one of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3729488"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3730011"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>,
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<a class="link" href="logc.html" title="The DB_LOGC Handle">DB_LOGC</a>,
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<a class="link" href="lsn.html" title="Chapter 7. The DB_LSN Handle">DB_LSN</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3730051"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="lsn.html#loglist" title="Logging Subsystem and Related Methods">Logging Subsystem and Related Methods</a>
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</p>
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||
</div>
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||
</div>
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<div class="navfooter">
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||
<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="envlog_set_config.html">Prev</a> </td>
|
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<td width="20%" align="center">
|
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<a accesskey="u" href="lsn.html">Up</a>
|
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="logstat_print.html">Next</a></td>
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</tr>
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<tr>
|
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<td width="40%" align="left" valign="top">DB_ENV->log_set_config() </td>
|
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DB_ENV->log_stat_print()</td>
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</tr>
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</table>
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</body>
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</html>
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