<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Release 4.6: Upgrade Requirements</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> <link rel="up" href="upgrade_4_6_toc.html" title="Chapter 43. Upgrading Berkeley DB 4.5 applications to Berkeley DB 4.6" /> <link rel="prev" href="upgrade_4_6_win.html" title="Release 4.6: Windows 9X" /> <link rel="next" href="changelog_4_6.html" title="Berkeley DB 4.6.21 Change Log" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Release 4.6: Upgrade Requirements</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="upgrade_4_6_win.html">Prev</a> </td> <th width="60%" align="center">Chapter 43. Upgrading Berkeley DB 4.5 applications to Berkeley DB 4.6</th> <td width="20%" align="right"> <a accesskey="n" href="changelog_4_6.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="upgrade_4_6_disk"></a>Release 4.6: Upgrade Requirements</h2> </div> </div> </div> <p>The log file format changed in the Berkeley DB 4.6 release.</p> <p>The format of Hash database pages was changed in the Berkeley DB 4.6 release, and items are now stored in sorted order. <span class="bold"><strong>The format changes are entirely backward-compatible, and no database upgrades are needed.</strong></span> However, upgrading existing databases can offer significant performance improvements. Note that databases created using the 4.6 release may not be usable with earlier Berkeley DB releases.</p> <p>For further information on upgrading Berkeley DB installations, see <a class="xref" href="upgrade_process.html" title="Upgrading Berkeley DB installations">Upgrading Berkeley DB installations</a>.</p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="upgrade_4_6_win.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="upgrade_4_6_toc.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="changelog_4_6.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Release 4.6: Windows 9X </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Berkeley DB 4.6.21 Change Log</td> </tr> </table> </div> </body> </html>