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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Partitioning</h1>
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      <p><a href="#mdk">Partitioned MDK Indexes</a></p>
      <p><a href="#ask">Partitioned ASK Indexes</a></p>
      <p class="line">&nbsp;</p>
      <p><a href="Partitioning.htm">Partitioning</a></p>
      <p><a href="Partitioning.htm#limits"><img src="../../images/blank.gif" width="15" height="10" border="0">Limitations</a></p>
      <p><a href="Partitioning.htm#updates"><img src="../../images/blank.gif" width="15" height="10" border="0">Data 
        Updates</a></p>
      <p><a href="Analysis.htm">1. Analysis</a></p>
      <p><a href="Partition%20the%20Table.htm">2. Partition the Table</a></p>
      <p> <a href="Environment%20File.htm">3. Environment File Entry</a></p>
      <p><a href="Indexing.htm">4. Indexing</a></p>
      <p><a href="Example1.htm">Examples</a></p>
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      <h2 class="line">Step 4 - Indexing</h2>
      <p><a href="Example4.htm">Example</a></p>
      <p>After the table has been analyzed and partitioned and the environment 
        file has been modified to reflect the partitions, the indexes must be 
        installed and built.</p>
      <p>Indexing rules are the same as for indexing any other table. However, 
        the indexes will be installed on each individual partition, NOT the union 
        view. This will increase the number of index files created.</p>
      <p>The index installation will usually be identical for every partition, 
        although this is not a requirement. </p>
      <p>The partition qualifier should always be installed with Omnidex indexes: 
        MDK, ASK or composite. This will further enhance performance gains realized 
        from partitioning the data.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="mdk" id="mdk"></a>Partitioned MDK Indexes</h3>
      <p>Partitioned MDK indexes use composite indexes to combine the partition 
        qualifier with other criteria. This is one of the easiest ways to increase 
        the speed of large searches and dramatically reduce the cost of large 
        preintersect counts. </p>
      <p>The partition qualifier should be the first component of the composite 
        index. The composite index components must be non-parsed fields; that 
        is, installed without the ;KW (keyword) index option.</p>
      <p>Using partitioned MDK indexes allows multiple columns to be used as the 
        partition qualifier. Multiple composite indexes can be used and optimized 
        in the same query.</p>
      <p><img src="../../images/note.gif" width="12" height="15" border="0" align="left">Composite 
        keys are limited to 240 bytes.</p>
      <p><img src="../../images/note.gif" width="12" height="15" border="0" align="left">If 
        a composite key consists of more than 5 components, performance will usually 
        start to degrade, unless criteria is an exact match with the composite 
        key.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="ask"></a>Partitioned ASK Indexes</h3>
      <p>Partitioned ASK indexes use the partition qualifier as the first component 
        of an aggregation index and are extremenly useful when the partition qualifier 
        is provided as criteria in the select statement. Only the portion of the 
        aggregation index that corresponds to the partition qualifier will be 
        read, greatly enhancing the query speed.</p>
      <p>This is most useful when a large number of aggregations use the same 
        column (partition qualifier) in the criteria. The criteria applied to 
        the partition qualifier must use = or an IN clause.</p>
      <p>Partitioned ASK indexes are automatic, meaning they require no special 
        setup, including partitioning of the data. Installing an aggregation index 
        with the partition qualifier as the first component, partitions the indexes, 
        whether or not the table itself is partitioned.</p>
      <p> <img src="../../images/note.gif" width="12" height="15" border="0" align="left">The 
        criteria list in an IN clause is limited to 32 values.</p>
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