docs/upgrading/upgrade_3_1_logalloc.html

   1 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
   2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   3 <html xmlns="http://www.w3.org/1999/xhtml">
   4   <head>
   5     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
   6     <title>log file pre-allocation</title>
   7     <link rel="stylesheet" href="gettingStarted.css" type="text/css" />
   8     <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
   9     <link rel="start" href="index.html" title="Berkeley DB Upgrade Guide" />
  10     <link rel="up" href="upgrade_3_1_toc.html" title="Chapter 13. Upgrading Berkeley DB 3.0 applications to Berkeley DB 3.1" />
  11     <link rel="prev" href="upgrade_3_1_tmp.html" title="DB_TMP_DIR" />
  12     <link rel="next" href="upgrade_3_1_disk.html" title="Upgrade Requirements" />
  13   </head>
  14   <body>
  15     <div xmlns="" class="navheader">
  16       <div class="libver">
  17         <p>Library Version 11.2.5.3</p>
  18       </div>
  19       <table width="100%" summary="Navigation header">
  20         <tr>
  21           <th colspan="3" align="center">log file pre-allocation</th>
  22         </tr>
  23         <tr>
  24           <td width="20%" align="left"><a accesskey="p" href="upgrade_3_1_tmp.html">Prev</a> </td>
  25           <th width="60%" align="center">Chapter 13. Upgrading Berkeley DB 3.0 applications to Berkeley DB 3.1</th>
  26           <td width="20%" align="right"> <a accesskey="n" href="upgrade_3_1_disk.html">Next</a></td>
  27         </tr>
  28       </table>
  29       <hr />
  30     </div>
  31     <div class="sect1" lang="en" xml:lang="en">
  32       <div class="titlepage">
  33         <div>
  34           <div>
  35             <h2 class="title" style="clear: both"><a id="upgrade_3_1_logalloc"></a>log file pre-allocation</h2>
  36           </div>
  37         </div>
  38       </div>
  39       <p>This change only affects Win/32 applications.</p>
  40       <p>On Win/32 platforms Berkeley DB no longer pre-allocates log files.  The problem
  41 was a noticeable performance spike as each log file was created.  To turn
  42 this feature back on, search for the flag DB_OSO_LOG in the source file
  43 <code class="filename">log/log_put.c</code> and make the change described there, or contact
  44 us for assistance.</p>
  45     </div>
  46     <div class="navfooter">
  47       <hr />
  48       <table width="100%" summary="Navigation footer">
  49         <tr>
  50           <td width="40%" align="left"><a accesskey="p" href="upgrade_3_1_tmp.html">Prev</a> </td>
  51           <td width="20%" align="center">
  52             <a accesskey="u" href="upgrade_3_1_toc.html">Up</a>
  53           </td>
  54           <td width="40%" align="right"> <a accesskey="n" href="upgrade_3_1_disk.html">Next</a></td>
  55         </tr>
  56         <tr>
  57           <td width="40%" align="left" valign="top">DB_TMP_DIR </td>
  58           <td width="20%" align="center">
  59             <a accesskey="h" href="index.html">Home</a>
  60           </td>
  61           <td width="40%" align="right" valign="top"> Upgrade Requirements</td>
  62         </tr>
  63       </table>
  64     </div>
  65   </body>
  66 </html>