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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Partitioning</h1>
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<p>&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 3 - Environment File Entry</h2>
      <p>Defining a partitioned table in an environment file must be done correctly 
        in order for Omnidex to understand the partitioning scheme. This will 
        enable Omnidex to search only those partitions relevant to the query, 
        ignoring the other partitions.</p>
      <p>ODXSQL can automatically generate the environment file entries for a 
        partitioned table, if the PARTITION command is used to partition the table. 
        The WITH options, ENVIRONMENTFILE=filename and ENVIRONMENTSNIPPET=filename, 
        will generate an environment source file for the entire database including 
        the partitioned table or a &quot;snippet&quot; for just the partitioned 
        table, in the specified output file.</p>
      <p>The new environment file can be modified for use in place of the existing 
        environment file. The environment snippet can be cut and pasted into the 
        existing environment source file. In both cases, the environment file 
        must be recompiled, indexes reinstalled for the existing tables, and indexes 
        installed and built for the partitioned table.</p>
      <p><img src="../../images/note.gif" alt="Note: " width="12" height="15" align="left">If 
        the order of the tables defined in the environment file changed, the indexes 
        will have to be rebuilt for the entire database. If the table order did 
        not change, meaning the partitioned table was added to the end of the 
        database definition, the indexes must be built only for the partitioned 
        table.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="entry" id="entry"></a>Entry</h3>
      <p>&nbsp;</p>
      <p>The environment file entry consists of a table definition that UNIONs 
        all of the partitions together, and a separate table definition for each 
        partition.</p>
      <p> The UNION table definition:</p>
      <ul>
        <li>is named the same as the original unpartitioned table. This name will 
          be used in SQL statements. </li>
        <li>references all of the partitions in a UNION ALL statement. </li>
        <li>has the detailed column definitions. All of the partitions will use 
          these same column definitions, either by referencing them with the &quot;columns 
          from table&quot; clause or by physically copying the column definitions 
          into each partition definition. </li>
        <li>will <strong>NOT</strong> be indexed. The indexes are installed on 
          the partitions only. </li>
      </ul>
      <p>There will be a separate partition table definition for each partition. 
      </p>
      <p>Each partition table definition:</p>
      <ul>
        <li>will have a physical clause that points to the physical partition 
          file. </li>
        <li>will have partitioned by clause containing the partition qualifier 
          for that partition. </li>
        <li>will have foreign key declarations referencing parent table keys </li>
        <li>will have either a columns from clause referencing the UNION table 
          or a duplicate copy of the column definitions from the UNION table.</li>
      </ul>
      <p>&nbsp;</p>
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