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36 lines
1.3 KiB
HTML
36 lines
1.3 KiB
HTML
<!DOCTYPE HTML PUBLIC> <HTML>
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<HEAD>
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<TITLE>Database tables</TITLE>
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<META http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
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<!--LINK rel="Stylesheet" type="text/css" href="doc.css"-->
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</HEAD>
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<BODY>
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<h1>Database tables</h1>
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<h2>quiz_newest_states</h2>
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This table exists only for efficiency reasons:
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<ol>
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<li>Via its 'newest' and 'newgraded' fields it gives attempt.php
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a way to quickly find the newest state
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and the newest graded state for an attempt. It allows the
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construction of SQL to select all the states that need to be loaded
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on attempt.php or review.php.</li>
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<li>Via its 'sumpenalty' field it gives quiz_apply_penalty() a quick
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way for getting at the accummulated penalty that needs to be applied.
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Without this field the penalties from all previous graded states
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would have to be added up each time. Not a big deal actually because
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this could be achieved with a single SQL query (using SUM) but this
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field was introduced when we still had the multiplicative penalty
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scheme around which would have been more difficult to recompute.</li>
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</ol>
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This table was introduced in Moodle 1.5 and is not populated for all
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states during the upgrade because on sites with a lot of existing
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states that could take too long. Rather it is done whenever needed
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by quiz_upgrade_states().
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</BODY> </HTML>
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