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      <p><a href="#buff">Buffer Size</a></p>
      <p class="line">&nbsp;</p>
      <p>DBINSTAL</p>
      <p><a href="Commands.htm">Commands</a></p>
      <p><a href="Indexing%20Options.htm">Indexing Options</a></p>
      <p><a href="Program%20Operation.htm">Program Operation</a></p>
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      <h2>DBINSTAL</h2>
      <p>DBINSTAL is a server based console utility that is used to install and 
        build the Omnidex indexes. Indexing options are specified during the DBINSTAL 
        installation process and then built with the DBINSTAL Build command.</p>
      <p><img src="../../images/note.gif" width="12" height="15">It is important 
        to note that the two processes, installing the indexes and building the 
        indexes, are two completely separate processes that do not necessarily 
        have to be performed at the same time. This means that there are times 
        when the indexes must be reinstalled but not necessarily rebuilt, for 
        instance when upgrading a minor version of Omnidex, with the exception 
        of upgrading from 4.0.7 to 4.0.8. See Index File Limits for more information 
        about this upgrade. </p>
      <p>There are also times when the indexes must be rebuilt but not necessarily 
        reinstalled, like when deferring indexing to a batch process in an update 
        application. The existing index installation is still valid but the indexes 
        are built and rebuilt during periodic batch processes.</p>
      <p>The actual process of the Build command is to serially read the specified 
        table and unload the appropriate columns of data into a special Omnidex 
        unload file. This file is then read and the physical Omnidex indexes are 
        populated with the internal Omnidex index structure from the unload file. 
        Omnidex has options to generate multiple indexes and uses very high-speed 
        processing techniques to minimize the actual indexing time.</p>
      <p>For the initial index installation and build, DBINSTAL should be run 
        interactively. Manually define the MDK and ASK indexes for each table 
        and then run the Build command to populate the index files. After this 
        is complete, run OAHELPER to generate an installation batch script. This 
        script allows the indexes to be re-installed and re-built in the future 
        by simply executing the script. This installation script can be easily 
        modified using any text editor.</p>
      <p><img src="../../images/note.gif" width="12" height="15">If DBINSTAL prematurely 
        stops on UNIX systems (for example, results in a core dump), particularly 
        on HP-UX systems, then run DBINSTAL again for each indexing operation, 
        or try reducing the memory allocation through DBINSTAL's BUF=n option. 
        This problem is due to an anomaly in some versions of UNIX. A DISC work-around 
        is in progress.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="buff"></a>Buffer Size</h3>
      <p>Use the DBINSTAL Build BUF=n option to allocate an appropriate amount 
        of memory for DBINSTAL indexing operations.</p>
      <p>Determining the optimal BUF=n size is best done by trial and error on 
        a subset of the database. Monitor the number of sort segments required 
        (displayed by DBINSTAL). The maximum is 2048 segments. Vary the BUF=n 
        size on the database subset, and use the BUF=n value that provides a sort 
        segment size closest to 1024.</p>
      <p>Use 8 Mbytes of BUF=n space for each Distributed Index (;DI) processed. 
        If a Build option of @9 is used, then the BUF=n size should be set to 
        72 (8 * 9).</p>
      <h2>&nbsp;</h2>
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