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<a accesskey="3" href="page.php?w=consistency_%28database_systems%29&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=database_systems">database systems</a>, <b>consistency</b> (or <b>correctness</b>) refers to the requirement that any given <a href="page.php?w=database_transaction">database transaction</a> must change affected data only in allowed ways. Any data written to the database must be valid according to all defined rules, including <a href="page.php?w=Integrity_constraints">constraints</a>, <a href="page.php?w=Cascading_rollback">cascades</a>, <a href="page.php?w=Database_trigger">triggers</a>, and any combination thereof.  This</p><p>
<a accesskey="3" href="page.php?w=consistency_%28database_systems%29&amp;p=2">3.Next</a>
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