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<div class="tagline">Small. Fast. Reliable.<br>Choose any three.</div>
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<a href="about.html">About</a>
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<a href="docs.html">Documentation</a>
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<a href="download.html">Download</a>
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<div class=startsearch></div>
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<h1 align=center>About SQLite</h1>
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<table align="right" border="1" cellpadding="10" hspace="20" cellspacing="0">
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<li> <a href="features.html">Features</a> </li>
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<li> <a href="faq.html">Frequently Asked Questions</a> </li>
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<li> <a href="famous.html">Well-known Users</a> </li>
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<li> <a href="books.html">Books About SQLite</a> </li>
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<li> <a href="quickstart.html">Getting Started</a> </li>
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<li> <a href="lang.html">SQL Syntax</a>
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<li> <a href="pragma.html#toc">Pragmas</a>
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<li> <a href="lang_corefunc.html">SQL functions</a>
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<li> <a href="lang_datefunc.html">Date & time functions</a>
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<li> <a href="lang_aggfunc.html">Aggregate functions</a>
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<li> <a href="c3ref/intro.html">C/C++ Interface Spec</a>
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<li> <a href="cintro.html">Introduction</a>
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<li> <a href="c3ref/funclist.html">List of C-language APIs</a>
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<li> <a href="tclsqlite.html">The TCL Interface Spec</a>
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<li> <a href="http://www.sqlite.org/src/timeline">Development Timeline</a> </li>
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<li> <a href="http://www.sqlite.org/src/wiki?name=Bug+Reports">Report a Bug</a> </li>
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<p>SQLite is a 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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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 currently found in 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 file format 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="whentouse.html#appfileformat">Application File Format</a>.
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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 350KiB,
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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.) If optional features are omitted, the
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size of the SQLite library can be reduced below 200KiB. SQLite can also
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be made to run in minimal stack space (4KiB) and
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very little heap (100KiB), making SQLite a popular database engine
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choice on memory constrained gadgets such as cellphones, PDAs, and MP3 players.
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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.</p>
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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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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=2">bugs lists</a>
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<a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">
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critical bugs</a> and
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minute-by-minute <a href="http://www.sqlite.org/src/timeline">
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chronologies</a> of bug reports and 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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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 file format.
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The source code is absolutely free to anybody who wants it,
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but <a href="support.html#prosupport">professional support</a> is also available.</p>
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<p>We the developers hope that you find SQLite useful and we
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charge 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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