204 lines
8.4 KiB
HTML
204 lines
8.4 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>About 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="docs.html">Documentation</a>
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<li class='desktoponly'><a href="download.html">Download</a>
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<li class='wideonly'><a href='copyright.html'>License</a>
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<li class='desktoponly'><a href="support.html">Support</a>
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<li class='desktoponly'><a href="prosupport.html">Purchase</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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</ul>
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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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</div>
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</div>
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<script>
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function toggle_div(nm) {
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var w = document.getElementById(nm);
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if( w.style.display=="block" ){
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w.style.display = "none";
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}else{
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w.style.display = "block";
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}
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}
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function toggle_search() {
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var w = document.getElementById("searchmenu");
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if( w.style.display=="block" ){
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w.style.display = "none";
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} else {
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w.style.display = "block";
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setTimeout(function(){
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document.getElementById("searchbox").focus()
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}, 30);
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}
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}
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function div_off(nm){document.getElementById(nm).style.display="none";}
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window.onbeforeunload = function(e){div_off("submenu");}
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/* Disable the Search feature if we are not operating from CGI, since */
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/* Search is accomplished using CGI and will not work without it. */
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if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
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document.getElementById("search_menubutton").style.display = "none";
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}
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/* Used by the Hide/Show button beside syntax diagrams, to toggle the */
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function hideorshow(btn,obj){
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var x = document.getElementById(obj);
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var b = document.getElementById(btn);
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if( x.style.display!='none' ){
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x.style.display = 'none';
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b.innerHTML='show';
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}else{
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x.style.display = '';
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b.innerHTML='hide';
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}
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return false;
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}
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</script>
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</div>
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<h1 align=center>About SQLite</h1>
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<div class="rightsidebar border2px">
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<h4 align="center">Executive Summary</h4>
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<ul>
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<li> <a href="fullsql.html">Full-featured SQL</a>
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<li> <a href='mostdeployed.html'>Billions and billions of deployments</a>
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<li> <a href='onefile.html'>Single-file database</a>
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<li> <a href='copyright.html'>Public domain source code</a>
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<li> All source code in one file (<a href='amalgamation.html'>sqlite3.c</a>)
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<li> <a href='footprint.html'>Small footprint</a>
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<li> Max DB size: <a href='limits.html'>281 terabytes</a>
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(2<sup><small>48</small></sup> bytes)
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<li> Max row size: <a href='limits.html'>1 gigabyte</a>
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<li> <a href='fasterthanfs.html'>Faster than direct file I/O</a>
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<li> <a href='testing.html'>Aviation-grade quality and testing</a>
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<li> <a href='zeroconf.html'>Zero-configuration</a>
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<li> <a href='transactional.html'>ACID transactions, even after power loss</a>
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<li> <a href='fileformat.html'>Stable, enduring file format</a>
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<li> <a href='doclist.html'>Extensive, detailed documentation</a>
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<li> <a href='lts.html'>Long-term support</a>
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</div>
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<p>SQLite is an in-process library that implements a
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<a href="selfcontained.html">self-contained</a>,
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<a href="serverless.html">serverless</a>,
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<a href="zeroconf.html">zero-configuration</a>,
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<a href="transactional.html">transactional</a>
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SQL database engine.
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The code for SQLite is in the
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<a href="copyright.html">public domain</a> and is thus free for
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use for any purpose, commercial or private.
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SQLite is the <a href="mostdeployed.html">most widely deployed</a> database in the world
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with more applications than we can
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count, including several <a href="famous.html">high-profile projects.</a></p>
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<p>SQLite is an embedded SQL database engine.
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Unlike most other SQL databases, SQLite does not have a separate
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server process. SQLite reads and writes directly to ordinary disk
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files. A complete SQL database with multiple tables, indices,
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triggers, and views, is contained in a single disk file.
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The database <a href="fileformat2.html">file format</a> is cross-platform - you can freely copy a database
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between 32-bit and 64-bit systems or between
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<a href="http://en.wikipedia.org/wiki/Endianness">big-endian</a> and
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<a href="http://en.wikipedia.org/wiki/Endianness">little-endian</a>
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architectures. These features make SQLite a popular choice as
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an <a href="appfileformat.html">Application File Format</a>. SQLite database files are a
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<a href="locrsf.html">recommended storage format</a> by the US Library of Congress.
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Think of SQLite not as a replacement for
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<a href="http://www.oracle.com/database/index.html">Oracle</a> but
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as a replacement for <a href="http://man.he.net/man3/fopen">fopen()</a></p>
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<p>SQLite is a compact library.
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With all features enabled, the <a href="footprint.html">library size</a> can be less than 600KiB,
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depending on the target platform and compiler optimization settings.
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(64-bit code is larger. And some compiler optimizations
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such as aggressive function inlining and loop unrolling can cause the
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object code to be much larger.)
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There is a tradeoff between memory usage and speed.
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SQLite generally runs faster the more memory
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you give it. Nevertheless, performance is usually quite good even
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in low-memory environments. Depending on how it is used, SQLite can be
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<a href="fasterthanfs.html">faster than direct filesystem I/O</a>.</p>
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<p>SQLite is
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<a href="testing.html">very carefully tested</a> prior to every
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release and has a reputation for being very reliable.
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Most of the SQLite source code is devoted purely to testing and
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verification. An automated test suite runs millions and millions of
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test cases involving hundreds of millions of individual SQL statements
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and achieves <a href="testing.html#coverage">100% branch test coverage</a>.
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SQLite responds gracefully to memory
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allocation failures and disk I/O errors. Transactions are
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<a href="http://en.wikipedia.org/wiki/ACID">ACID</a>
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even if interrupted by system crashes or power failures.
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All of this is verified by
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the automated tests using special test harnesses which simulate
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system failures.
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Of course, even with all this testing, there are still bugs.
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But unlike some similar projects (especially commercial competitors)
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SQLite is open and honest about all bugs and provides
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<a href="http://www.sqlite.org/src/rptview?rn=1">bugs lists</a> and
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minute-by-minute <a href="http://www.sqlite.org/src/timeline">
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chronologies</a> of code changes.</p>
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<p>The SQLite code base is supported by an
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<a href="crew.html">international team</a> of developers who work on
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SQLite full-time.
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The developers continue to expand the capabilities of SQLite
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and enhance its reliability and performance while maintaining
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backwards compatibility with the
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<a href="c3ref/intro.html">published interface spec</a>,
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<a href="lang.html">SQL syntax</a>, and database <a href="fileformat2.html">file format</a>.
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The source code is absolutely free to anybody who wants it,
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but <a href="prosupport.html">professional support</a> is also available.</p>
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<p>The SQLite project was started on
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<a href="https://www.sqlite.org/src/timeline?c=2000-05-29+14:26:00">2000-05-09</a>.
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The future is always hard to predict, but the intent of the developers
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is to support SQLite through the year 2050. Design decisions are made
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with that objective in mind.</p>
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<p>We the developers hope that you find SQLite useful and we
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entreat you to use it well: to make good and beautiful products that
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are fast, reliable, and simple to use. Seek forgiveness for yourself
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as you forgive others. And just as you have received SQLite for free,
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so also freely give, paying the debt forward.</p>
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