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Revision 4832

Added by daigle almost 16 years ago

Added jing's suggested changes

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query-caching.html
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    <div class="toc1"><a href="#PathIndexing">Common XML Path Indexing</a></div>
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      <div class="toc2"><a href="#HowPathIndexingWorks">How Common Path Indexing Works</a></div>
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      <div class="toc2"><a href="#PathIndexingDrawbacks">Common Path Indexing Drawbacks</a></div>
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    <div class="toc1"><a href="#UniqueResultset">Storing Unique Storing Unique Return Fields</a></div>
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      <div class="toc2"><a href="#HowUniqueResultsetWorks">How Storing Unique Storing Unique Return Fields Works</a></div>
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    <div class="toc1"><a href="#UniqueResultset">Storing Unique Return Fields</a></div>
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      <div class="toc2"><a href="#HowUniqueResultsetWorks">How Storing Unique Return Fields Works</a></div>
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      <div class="toc2"><a href="#UniqueResultsetDrawbacks">Drawbacks to Storing Unique Return Fields</a></div>
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  </div>
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  <a name="Overview"></a><div class="header1">Overview</div>
......
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    query result.</p>
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    <p>If the desired docid and result fields are found in these two tables, the query results are returned
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    directly from the xml_queryresult table and the xml_nodes table is never touched.</p>
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    directly from the xml_queryresult table and the xml_indes and xml_nodes tables are never touched.</p>
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    <p>Overall, this strategy works well.</p>
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    <a name="UniqueResultsetDrawbacks"></a><div class="header2">Drawbacks to Storing Unique Return Fields</div>
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    <p>The main issue with storing unique query results is that the query must be performed at least once for
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    each unique set of results and docid before it is added to the xml_returnfield and xml_queryresult tables.
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    This first run goes against the xml_index and xml_nodes tables and is slow.</p>
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  <br>
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  <a href="./service-base.html">Next</a>

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