166 lines
5.4 KiB
HTML
166 lines
5.4 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="sqlite.css" rel="stylesheet">
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<title>File Format Changes in SQLite</title>
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<!-- path= -->
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</head>
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<body>
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<div class=nosearch>
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<a href="index.html">
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<img class="logo" src="images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="index.html">Home</a>
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<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
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<li class='wideonly'><a href='about.html'>About</a>
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<li class='desktoponly'><a href="download.html">Download</a>
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<li class='search' id='search_menubutton'>
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<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
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</ul>
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</div>
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<div class="menu submenu" id="submenu">
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<ul>
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<li><a href='about.html'>About</a>
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<li><a href='docs.html'>Documentation</a>
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<li><a href='download.html'>Download</a>
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<li><a href='support.html'>Support</a>
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<li><a href='prosupport.html'>Purchase</a>
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</div>
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<div class="searchmenu" id="searchmenu">
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<form method="GET" action="search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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</select>
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<input type="text" name="q" id="searchbox" value="">
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<input type="submit" value="Go">
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</form>
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<script>
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/* Search is accomplished using CGI and will not work without it. */
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</script>
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<h2>File Format Changes in SQLite</h2>
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<p>
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The <a href="fileformat2.html">underlying file format</a> for SQLite databases does not
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change in incompatible ways. There are literally trillions of
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SQLite database files in circulation and the SQLite developers are
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committing to supporting those files for decades into the future.
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</p>
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<p>
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Prior to SQLite version 3.0.0 (2004-06-18), the file format did
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sometimes change from one release to the next. But since that time,
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the file format has been fully backwards compatible.
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</p>
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<p>
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By "backwards compatible" we mean that
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newer versions of SQLite can always read and write database files created
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by older versions of SQLite.
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It is often also the case that SQLite is "forwards compatible", that
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older versions of SQLite can read and write database files created by
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newer versions of SQLite. But there are sometimes forward compatibility
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breaks. Sometimes new features are added to the file format. For
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example, <a href="wal.html">WAL mode</a> was added in version 3.7.0 (2010-07-21).
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SQLite 3.7.0 and later can read and write all database files created
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by earlier versions of SQLite. And earlier versions of SQLite can
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read and write database files created by SQLite 3.7.0 and later
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<i>as long as the database does not use WAL mode</i>. But versions of
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SQLite prior to version 3.7.0 cannot read nor write SQLite database files
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that make use of WAL mode.
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</p>
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<h2>Summary</h2>
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<ul>
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<li><p>
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Newer versions of SQLite can always read and/or write database files
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created by older versions of SQLite, back to version 3.0.0 (2004-06-18).
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<li><p>
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Older versions of SQLite back to version 3.0.0 can read and write
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database files created by newer versions of SQLite as long as the
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database does not make use of newer features that are unknown to that
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older version.
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</ul>
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<p align="center"><small><i>This page last modified on <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink" data-href="https://sqlite.org/docsrc/finfo/pages/formatchng.in?m=8415958e0a">2022-09-13 14:04:46</a> UTC </small></i></p>
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