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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" --> 
      <h1>Omnidex Concepts - Indexing Options</h1>
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      <p><a href="#rules">Composite Index Rules</a></p>
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      <h2>Composite Indexes</h2>
      <p>OMNIDEX lets you create composite indexes that combine multiple columns 
        or parts of columns. You can create both MDK and ASK composite indexes 
        simply by specifying them within either the MDK or ASK installation section 
        of either DBINSTAL or the installation batch file. All composite indexes 
        let you:</p>
      <ul>
        <li>combine several columns into one index </li>
        <li>isolate part of a field into an index </li>
        <li>rearrange the order of bytes in an index</li>
      </ul>
      <p>In addition, you can create two special types of ASK composite indexes:</p>
      <ul>
        <li>index-only access indexes which are useful for very-high speed searches 
          and data warehousing installations. </li>
        <li>aggregate indexes which quickly calculate and report summaries of 
          numeric data for groups of rows. </li>
      </ul>
      <p class="line">&nbsp;</p>
      <h3><a name="rules" id="rules"></a>Composite Index Rules</h3>
      <p>Certain rules apply when designing and creating composite indexes:</p>
      <ul>
        <li>Each composite index must have a unique name. If you create both a 
          MDK and a ASK composite key with identical elements, you must name each 
          uniquely. </li>
        <li>Composite index components must come from the current table. If you 
          are installing interactively with DBINSTAL, enter H at a Component prompt 
          for a list of eligible columns. </li>
        <li>A column, or part of a column, can be used in more than one composite 
          index. You could, for example, rearrange or combine a SHIP_DATE column 
          with other columns in several composite indexes. </li>
      </ul>
      <h4>MDK composite keys:</h4>
      <ul>
        <li>are indexed as ASCII (type X) by default </li>
        <li>can combine only character types </li>
        <li>if created from binary columns, must contain only one component and 
          be typecast as a valid binary data type.</li>
      </ul>
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