133 lines
4.0 KiB
HTML
133 lines
4.0 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>SQLite Is Transactional</title>
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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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<li><a href="index.html">Home</a>
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window.onbeforeunload = function(e){div_off("submenu");}
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</div>
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<h2>SQLite is Transactional</h2>
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<p>A transactional database is one in which all changes and queries
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appear to be
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Atomic, Consistent, Isolated, and Durable
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(<a href="http://en.wikipedia.org/wiki/ACID">ACID</a>).
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SQLite implements
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<a href="http://en.wikipedia.org/wiki/Serializability">serializable</a>
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transactions that are atomic, consistent, isolated, and durable,
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even if the transaction is interrupted by a program crash, an
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operating system crash, or a power failure to the computer.
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</p>
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<p>
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We here restate and amplify the previous sentence for emphasis:
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All changes within a single transaction in SQLite either occur
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completely or not at all, even if the act of writing the change
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out to the disk is interrupted by
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<ul>
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<li>a program crash,</li>
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<li>an operating system crash, or</li>
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<li>a power failure.</li>
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</ul>
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<p>
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<p>
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The claim of the previous paragraph is extensively checked in the
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SQLite regression test suite using a special test harness that
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simulates the effects on a database file of operating system crashes
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and power failures.
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</p>
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<p>
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<a href="atomiccommit.html">Additional information</a>
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</p>
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