<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><!-- InstanceBegin template="../../Templates/DocTemp.dwt" codeOutsideHTMLIsLocked="false" -->
<head>
<!-- InstanceBeginEditable name="doctitle" -->
<title>Omnidex Concepts - Optimization</title>
<!-- InstanceEndEditable --> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="../../docs.css" rel="stylesheet" type="text/css">
<script language="JavaScript1.2" src="../../docs.js"></script>
<!-- InstanceBeginEditable name="head" --><!-- InstanceEndEditable -->
</head>

<body>
<table width="100%" class="lightblue" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td><a href="http://www.omnidex.com"><img src="../../images/flatlogo.gif" width="95" height="25" hspace="3" vspace="3" border="0"></a></td>
    <td><img src="../../images/omnidex.gif" width="109" height="25" hspace="3" vspace="3"></td>
    <td align="right" valign="top"><p class="banner"><a href="../../Contents.htm">Contents</a> 
        | <a href="../../Quick%20Links.htm">Quick Links</a></p></td>
  </tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr> 
    <td width="175" class="bar"><p class="banner">&nbsp;</p></td>
    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Omnidex Concepts</h1>
      <!-- InstanceEndEditable --></td>
  </tr>
  <tr> 
    <td width="175" class="left1 lightblue"><img src="../../images/blank.gif" width="10" height="20"> 
    </td>
    <td valign="top" class="left1 lightblue">&nbsp; </td>
  </tr>
  <tr> 
    <td width="175" valign="top" class="left"><!-- InstanceBeginEditable name="leftnav" -->
      <p>left navigation</p>
      <p>&nbsp;</p>
      <!-- InstanceEndEditable --></td>
    <td valign="top" class="content"> <!-- InstanceBeginEditable name="Content" --> 
      <h2>Optimization</h2>
      <p>Omnidex will attempt to optimize queries to run in the most efficient 
        manner by using the indexes. This section discusses various scenarios, 
        showing exactly how they were or were not optimized.</p>
      <p>The best tool for ensuring optimized queries is the Omnidex utility ODXSQL. 
        ODXSQL can produce an Explain Plan for all queries, detailing the exact 
        steps Omnidex took to process the query. The Explain Plan lists how a 
        query was optimized, if applicable, provides warnings on potential problems 
        as well as other detailed information that may assist in refining queries 
        to run as efficiently as possible. The information provided by the Explain 
        Plan can then be used to help &quot;tune&quot; the query or the indexes 
        to ensure optimal performance.</p>
      <p>If the index installation does not match the query criteria specification, 
        assuming the query syntax is valid, the query will still be processed. 
        Omnidex will attempt to optimize the query as much as possible.</p>
      <p class="line">&nbsp;</p>
      <h3>One-Pass vs Deferred Optimization</h3>
      <p>One-pass optimization is Omnidex's ability to completely process a query 
        without physically touching the database until the final qualified row 
        retrieval. This means that all of the given criteria is satisfied and 
        a final qualified list can be produced entirely within the indexes.</p>
      <p>Deferred optimization means that at some point while processing the query, 
        Omnidex was forced to retrieve some data from the database before it could 
        completely satisfy all of the given criteria. This does not mean that 
        the query is not optimized, however. It simply means that the query had 
        to be broken into multiple pieces, but each piece on its own, may still 
        be optimized.</p>
      <!-- InstanceEndEditable --><P align="right"><a href="#">Top</a> </P>
	  </td>
  </tr>
  <tr>
    <td width="175" class="bbar">
<p>&nbsp;</p></td>
    <td align="right" valign="middle" class="bbar"> <p class="banner">Omnidex 
        Version 4.1 Build 1 - E10.04 - Dynamic Information Systems Corporation 
        - Copyright &copy; 2004</p></td>
  </tr>
</table>
<div class="menu0" id="m1" onMouseOver="changeClass('menu1','m1'); changeVisibility('visible','s1');" onMouseOut="changeClass('menu0','m1'); changeVisibility('hidden','s1');"> 
  <a href="../../index.htm">Home</a></div>      
<div class="menu0" id="m2" onMouseOver="changeClass('menu1','m2'); changeVisibility('visible','s2');" onMouseOut="changeClass('menu0','m2'); changeVisibility('hidden','s2');"> 
  <a href="../../Omnidex%20Concepts/Omnidex%20Overview.htm">Omnidex</a></div>      
<div class="menu0" id="m3" onMouseOver="changeClass('menu1','m3'); changeVisibility('visible','s3');" onMouseOut="changeClass('menu0','m3'); changeVisibility('hidden','s3');"> 
  <a href="../../Getting%20Started/Getting%20Started.htm">Getting Started </a></div>      
<div class="menu0" id="m4" onMouseOver="changeClass('menu1','m4'); changeVisibility('visible','s4');" onMouseOut="changeClass('menu0','m4'); changeVisibility('hidden','s4');"> 
  <a href="../../Development/Development.htm">Development</a></div>      
<div class="menu0" id="m5" onMouseOver="changeClass('menu1','m5'); changeVisibility('visible','s5');" onMouseOut="changeClass('menu0','m5'); changeVisibility('hidden','s5');"> 
  <a href="../../Utilities/Utilities.htm">Utilities</a></div>      
<div class="menu0" id="m6" onMouseOver="changeClass('menu1','m6'); changeVisibility('visible','s6');" onMouseOut="changeClass('menu0','m6'); changeVisibility('hidden','s6');"> 
  <a href="../../Appendix/Appendix.htm">Appendix</a></div>
    <td>&nbsp;</td>
  </tr>
</table> 
<table id="s1" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m1'); changeVisibility('visible','s1');" onMouseOut="changeClass('menu0','m1'); changeVisibility('hidden','s1');">
  <tr> 
    <td id="s11" class="menu1" onMouseOver="changeClass('menu0','s11');" onMouseOut="changeClass('menu1','s11');"><a href="../../Whats%20New.htm">What's 
      New!</a></td>
  </tr>
  <tr> 
    <td id="s12" class="menu1" onMouseOver="changeClass('menu0','s12');" onMouseOut="changeClass('menu1','s12');"><a href="../../Quick%20Links.htm">Quick 
      Links</a></td>
  </tr>
  <tr> 
    <td id="s13" class="menu1" onMouseOver="changeClass('menu0','s13');" onMouseOut="changeClass('menu1','s13');"><a href="../../Contents.htm">Contents</a></td>
  </tr>
</table>
<table id="s2" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m2'); changeVisibility('visible','s2');" onMouseOut="changeClass('menu0','m2'); changeVisibility('hidden','s2');">
  <tr> 
    <td id="s21" class="menu1" onMouseOver="changeClass('menu0','s21');" onMouseOut="changeClass('menu1','s21');"><a href="../../Omnidex%20Concepts/Features/Features.htm">Features</a></td>
  </tr>
  <tr> 
    <td id="s22" class="menu1" onMouseOver="changeClass('menu0','s22');" onMouseOut="changeClass('menu1','s22');"><a href="../../Omnidex%20Concepts/Indexing%20Strategies/Indexing%20Strategies.htm">Indexing 
      Strategies</a></td>
  </tr>
  <tr> 
    <td id="s23" class="menu1" onMouseOver="changeClass('menu0','s23');" onMouseOut="changeClass('menu1','s23');"><a href="../../Omnidex%20Concepts/Indexing%20Options/Indexing%20Options.htm">Indexing 
      Options </a></td>
  </tr>
  <tr> 
    <td id="s24" class="menu1" onMouseOver="changeClass('menu0','s24');" onMouseOut="changeClass('menu1','s24');"><a href="../../Omnidex%20Concepts/Index%20Maintenance/Index%20Maintenance.htm">Index 
      Maintenance </a></td>
  </tr>
  <tr> 
    <td id="s25" class="menu1" onMouseOver="changeClass('menu0','s25');" onMouseOut="changeClass('menu1','s25');"><a href="../../Omnidex%20Concepts/Partitioning/Partitioning.htm">Optimization</a></td>
  </tr>
  <tr> 
    <td id="s26" class="menu1" onMouseOver="changeClass('menu0','s26');" onMouseOut="changeClass('menu1','s26');"><a href="../../Omnidex%20Concepts/Index%20Maintenance/Index%20Maintenance.htm">Partitioning</a></td>
  </tr>
  <tr> 
    <td id="s27" class="menu1" onMouseOver="changeClass('menu0','s27');" onMouseOut="changeClass('menu1','s27');"><a href="../../Omnidex%20Concepts/Text/Omnidex%20Text.htm">Omnidex Text</a></td>
  </tr>
</table>
<table id="s3" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m3'); changeVisibility('visible','s3');" onMouseOut="changeClass('menu0','m3'); changeVisibility('hidden','s3');">
  <tr> 
    <td id="s31" class="menu1" onMouseOver="changeClass('menu0','s31');" onMouseOut="changeClass('menu1','s31');"><a href="../../Getting%20Started/1%20-%20Installation%20and%20Setup.htm">Server 
      Setup Guides</a></td>
  </tr>
  <tr> 
    <td id="s32" class="menu1" onMouseOver="changeClass('menu0','s32');" onMouseOut="changeClass('menu1','s32');"><a href="../../Getting%20Started/Omnidex%20Client/Windows%20Client.htm">Windows 
      Client</a></td>
  </tr>
  <tr> 
    <td id="s33" class="menu1" onMouseOver="changeClass('menu0','s33');" onMouseOut="changeClass('menu1','s33');"><a href="../../Database%20Platforms/Supported%20Database%20Platforms.htm">Database 
      Platforms </a></td>
  </tr>
  <tr> 
    <td id="s34" class="menu1" onMouseOver="changeClass('menu0','s34');" onMouseOut="changeClass('menu1','s34');"><a href="../../Environment%20Catalog/Environment%20Catalog.htm">Environment 
      Catalog</a> </td>
  </tr>
</table>
<table id="s4" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m4'); changeVisibility('visible','s4');" onMouseOut="changeClass('menu0','m4'); changeVisibility('hidden','s4');">
  <tr> 
    <td id="s41" class="menu1" onMouseOver="changeClass('menu0','s41');" onMouseOut="changeClass('menu1','s41');"><a href="../../SQL%20Reference/SQL%20Reference.htm">SQL 
      Reference</a> </td>
  </tr>
  <tr> 
    <td id="s42" class="menu1" onMouseOver="changeClass('menu0','s42');" onMouseOut="changeClass('menu1','s42');"><a href="../../Development/ODBC/ODBC.htm">ODBC</a></td>
  </tr>
  <tr> 
    <td id="s43" class="menu1" onMouseOver="changeClass('menu0','s43');" onMouseOut="changeClass('menu1','s43');"><a href="../../Development/JDBC/JDBC.htm">JDBC</a></td>
  </tr>
  <tr> 
    <td id="s44" class="menu1" onMouseOver="changeClass('menu0','s44');" onMouseOut="changeClass('menu1','s44');"><a href="../../Development/OmniAccess%20API/OmniAccess%20API.htm">OmniAccess 
      API</a></td>
  </tr>
  <tr> 
    <td id="s45" class="menu1" onMouseOver="changeClass('menu0','s45');" onMouseOut="changeClass('menu1','s45');"><a href="../../Development/Debugging/OMNIDEX_DEBUG.htm">Debugging</a></td>
  </tr>
</table>
<table id="s5" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m5'); changeVisibility('visible','s5');" onMouseOut="changeClass('menu0','m5'); changeVisibility('hidden','s5');">
  <tr> 
    <td id="s51" class="menu1" onMouseOver="changeClass('menu0','s51');" onMouseOut="changeClass('menu1','s51');"><A href="../../Utilities/DBINSTAL/DBINSTAL.htm">DBINSTAL</A></td>
  </tr>
  <tr> 
    <td id="s52" class="menu1" onMouseOver="changeClass('menu0','s52');" onMouseOut="changeClass('menu1','s52');"><a href="../../Utilities/DSEDIT/DSEDIT.htm">DSEDIT</a></td>
  </tr>
  <tr> 
    <td id="s53" class="menu1" onMouseOver="changeClass('menu0','s53');" onMouseOut="changeClass('menu1','s53');"><a href="../../Utilities/NSADMIN/NSADMIN.htm">NSADMIN</a></td>
  </tr>
  <tr> 
    <td id="s54" class="menu1" onMouseOver="changeClass('menu0','s54');" onMouseOut="changeClass('menu1','s54');"><a href="../../Utilities/OACOMP/OACOMP.htm">OACOMP</a></td>
  </tr>
  <tr> 
    <td id="s55" class="menu1" onMouseOver="changeClass('menu0','s55');" onMouseOut="changeClass('menu1','s55');"><a href="../../Utilities/OADECOMP/OADECOMP.htm">OADECOMP</a></td>
  </tr>
  <tr> 
    <td id="s56" class="menu1" onMouseOver="changeClass('menu0','s56');" onMouseOut="changeClass('menu1','s56');"><a href="../../Utilities/OAHELPER/OAHELPER.htm">OAHELPER</a></td>
  </tr>
  <tr> 
    <td id="s57" class="menu1" onMouseOver="changeClass('menu0','s57');" onMouseOut="changeClass('menu1','s57');"><A href="../../Utilities/ODXAIM/ODXAIM.htm">ODXAIM</A></td>
  </tr>
  <tr> 
    <td id="s58" class="menu1" onMouseOver="changeClass('menu0','s58');" onMouseOut="changeClass('menu1','s58');"><a href="../../Utilities/ODXMAKE/ODXMAKE.htm">ODXMAKE</a></td>
  </tr>
  <tr> 
    <td id="s59" class="menu1" onMouseOver="changeClass('menu0','s59');" onMouseOut="changeClass('menu1','s59');"><a href="../../Utilities/ODXNET/ODXNET.htm">ODXNET</a></td>
  </tr>
  <tr> 
    <td id="s510" class="menu1" onMouseOver="changeClass('menu0','s510');" onMouseOut="changeClass('menu1','s510');"><A href="../../Utilities/ODXQUERY/ODXQUERY.htm">ODXQUERY</A></td>
  </tr>
  <tr> 
    <td id="s511" class="menu1" onMouseOver="changeClass('menu0','s511');" onMouseOut="changeClass('menu1','s511');"><a href="../../Utilities/ODXSQL/ODXSQL.htm">ODXSQL</a></td>
  </tr>
  <tr> 
    <td id="s512" class="menu1" onMouseOver="changeClass('menu0','s512');" onMouseOut="changeClass('menu1','s512');"><a href="../../Utilities/REGMAINT/REGMAINT.htm">REGMAINT</a></td>
  </tr>
  <tr> 
    <td id="s513" class="menu1" onMouseOver="changeClass('menu0','s513');" onMouseOut="changeClass('menu1','s513');"><A href="../../Utilities/REGTEST/REGTEST.htm">REGTEST</A></td>
  </tr>
  <tr> 
    <td id="s514" class="menu1" onMouseOver="changeClass('menu0','s514');" onMouseOut="changeClass('menu1','s514');"><a href="../../Utilities/SNOWGEN/SNOWGEN.htm">SNOWGEN</a></td>
  </tr>
  <tr> 
    <td id="s515" class="menu1" onMouseOver="changeClass('menu0','s515');" onMouseOut="changeClass('menu1','s515');"><a href="../../Utilities/SYSINFO/SYSINFO.htm">SYSINFO</a></td>
  </tr>
  <tr> 
    <td id="s516" class="menu1" onMouseOver="changeClass('menu0','s516');" onMouseOut="changeClass('menu1','s516');"><a href="../../Utilities/VERSIONS/VERSIONS.htm">VERSIONS</a></td>
  </tr>
  <tr> 
    <td id="s517" class="menu1" onMouseOver="changeClass('menu0','s517');" onMouseOut="changeClass('menu1','s517');"><a href="../../Utilities/VIEWGEN/VIEWGEN.htm">VIEWGEN</a></td>
  </tr>
</table>
<table id="s6" border="0" cellspacing="0" cellpadding="0" onMouseOver="changeClass('menu1','m6'); changeVisibility('visible','s6');" onMouseOut="changeClass('menu0','m6'); changeVisibility('hidden','s6');">
  <tr> 
    <td id="s61" class="menu1" onMouseOver="changeClass('menu0','s61');" onMouseOut="changeClass('menu1','s61');"><a href="../../Appendix/Cardinality.htm">Cardinality</a></td>
  </tr>
  <tr> 
    <td id="s62" class="menu1" onMouseOver="changeClass('menu0','s62');" onMouseOut="changeClass('menu1','s62');"><a href="../../Appendix/Date%20Formats.htm">Date 
      Formats </a></td>
  </tr>
  <tr> 
    <td id="s63" class="menu1" onMouseOver="changeClass('menu0','s63');" onMouseOut="changeClass('menu1','s63');"><a href="../../Appendix/Environment%20Variables.htm">Environment 
      Variables </a></td>
  </tr>
  <tr> 
    <td id="s64" class="menu1" onMouseOver="changeClass('menu0','s64');" onMouseOut="changeClass('menu1','s64');"><a href="../../Appendix/File%20Name%20Handling.htm">File 
      Name Handling</a></td>
  </tr>
  <tr> 
    <td id="s65" class="menu1" onMouseOver="changeClass('menu0','s65');" onMouseOut="changeClass('menu1','s65');"><a href="../../Appendix/Glossary%20A.htm">Glossary</a></td>
  </tr>
  <tr> 
    <td id="s66" class="menu1" onMouseOver="changeClass('menu0','s66');" onMouseOut="changeClass('menu1','s66');"><a href="../../Appendix/Null.htm">Null</a></td>
  </tr>
  <tr> 
    <td id="s67" class="menu1" onMouseOver="changeClass('menu0','s67');" onMouseOut="changeClass('menu1','s67');"><a href="../../Appendix/OAGLOBAL.htm">OAGLOBAL</a></td>
  </tr>
  <tr> 
    <td id="s68" class="menu1" onMouseOver="changeClass('menu0','s68');" onMouseOut="changeClass('menu1','s68');"><a href="../../Appendix/Operating%20Limits.htm">Operating 
      Limits</a></td>
  </tr>
  <tr> 
    <td id="s69" class="menu1" onMouseOver="changeClass('menu0','s69');" onMouseOut="changeClass('menu1','s69');"><a href="../../Appendix/Provided%20Managed%20Synonym%20Lists.htm">Managed 
      Synonym Lists</a></td>
  </tr>
  <tr> 
    <td id="s70" class="menu1" onMouseOver="changeClass('menu0','s70');" onMouseOut="changeClass('menu1','s70');"><a href="../../Appendix/Reserved%20Words.htm">Reserved 
      Words</a></td>
  </tr>
  <tr> 
    <td id="s71" class="menu1" onMouseOver="changeClass('menu0','s71');" onMouseOut="changeClass('menu1','s71');"><a href="../../Appendix/Supported%20Datatypes.htm">Supported 
      Data Types</a></td>
  </tr>
</table>
<p>&nbsp;</p>
</body>
<!-- InstanceEnd --></html>
