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      <h1>Database Platforms</h1>
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      <h2>Oracle</h2>
      <p>Omnidex supports Oracle databases, versions 8 and 9.</p>
      <h3>Omnidex Version 4.0 and newer</h3>
      <p>Omnidex can now store native rowids in the Omnidex indexes, regardless 
        of length. This eliminates the need for tidmaps entirely. Redefined rowids 
        can still be used but are no longer necessary unless the table does not 
        have a native rowid.</p>
      <p>Whether using the table's native index or a redefined rowid as the identity 
        column, the identity column must be supported by a unique index in the 
        native database.</p>
      <p class="line">&nbsp;</p>
      <h3>Omnidex Version 3.8</h3>
      <p>Oracle changed their native rowid in that the object ID portion of the 
        rowid is no longer constant. Therefore, Omnidex tidmaps were increased 
        to 12 digits in length to accommodate the Oracle change. These tidmaps 
        often fail and new tidmaps often cannot be found. DISC recommends using 
        redefined rowids to eliminate the need for tidmaps.</p>
      <p class="line">&nbsp;</p>
      <h3>Omnidex Version 3.7</h3>
      <p>Omnidex uses tidmaps to correspond to an Oracle native rowid. Tidmaps 
        are 6 digits in length, presuming that the object ID portion of the Oracle 
        rowid is constant for each table. Tidmaps are required unless a redefined 
        rowid is present. If tidmaps are not declared in the environment file 
        and a redefined rowid is not present, default tidmaps will be used.</p>
      <p>Tidmaps produce ill-behaved IDs, disabling most bitmap operations. Use 
        redefined rowids to ensure a well-behaved rowid.</p>
      <h3>&nbsp;</h3>
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