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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Indexing Strategies</h1>
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      <p><a href="Domains.htm">Domains</a></p>
      <p><a href="#si">SI Domain</a></p>
      <p><a href="#rs">RC Domain</a></p>
      <p><a href="DR%20Domain.htm">DR Domain</a></p>
      <p><a href="DR%20Domain.htm#hybrid">Hybrid-DR Domain</a></p>
      <p><a href="Sorted%20Multi-Find.htm">Sorted Multi-Find</a></p>
      <p><a href="Omnidex%20IDs%20by%20Domain.htm">Omnidex IDs by Domain</a></p>
      <p>&nbsp;</p>
      <p><a href="../Indexing%20Strategies.htm">Indexing Strategies</a></p>
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      <h2>Domains</h2>
      <p>A domain is an Omnidex term for the way tables relate to each other in 
        respect to the Omnidex indexes. Domains are used to join tables with a 
        one-to-many relationship using a field common to both tables. A domain 
        can also contain a single table.</p>
      <p>An Omnidex domain is a logical grouping of tables that have been installed 
        with Omnidex indexes. Queries performed against joined tables belonging 
        to the same domain, are optimized.</p>
      <p>Domains are named for the primary table they contain. In other words, 
        if a domain consists of a single parent table or a parent table with one 
        or more child tables joined to it, the domain name is the same as the 
        parent table. If the domain contains only a single, unjoined child table, 
        the domain name is the same as the child table.</p>
      <p>There are four domain types: SI domain, RS domain, DR domain, and Hybrid-DR.</p>
      <p>Omnidex domains:</p>
      <ul>
        <li>apply to MDK indexes only. </li>
        <li>create separate index files. </li>
        <li>determine what is stored in the index files. </li>
        <li>affect what the qualifying count represents.</li>
      </ul>
      <p>Parent-only domains can be ID/SI, TR or TRR. All indexes are RC indexes.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="si"></a>SI (Search Item) Domain</h3>
      <p>Installing an MDK (Multi-Dimensional Keyword) index on a single parent 
        table creates an SI domain. A parent table cannot be in more than one 
        domain. </p>
      <p>An SI domain is named after the parent table that it contains. For example, 
        if you installed an index on the parent table CUSTOMERS, the name of the 
        domain would be CUSTOMERS. MDK indexes on parent tables qualify parent 
        rows.</p>
      <p>Always install MDK indexes on parent tables first. Even if you don&#8217;t 
        install indexes on the parent table, you must specify its name at a Table 
        Name? prompt during MDK index installation if you want to prejoin child 
        tables to it to create a domain.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="rs"></a>RS (Record Specific) Domain</h3>
      <p>An RS (Record Specific) Domain is a parent table prejoined to one or 
        more child tables. This is also known as Pre-Joined indexing.</p>
      <ul>
        <li>Queries based on a parent/child relationship within the same domain 
          are very fast in either direction (parent to child or child to parent). 
        </li>
        <li>A child table may belong to one or more domains. </li>
        <li>The child table will be indexed as part of the parent table domain. 
        </li>
        <li>A child table prejoined to a parent table belongs to the parent&#8217;s 
          domain. </li>
        <li>Can query across domains using Bitmap joins and Multifinds. </li>
        <li>The Omnidex ID for the RS child table is a 64-bit Integer; 32-bits 
          for the parent table's Omnidex ID and 32-bits for the child table's 
          rowid. </li>
        <li>This child table cannot use Bitmap Indexing because of the 32-bit 
          Omnidex ID requirement. </li>
      </ul>
      <p>When a child table is prejoined (or linked) to a parent table, MDK indexes 
        installed on the child table can be used to qualify and retrieve rows 
        from either the child or its parent.</p>
      <p>When using this type of domain, the index can be installed with either 
        the Record Specific (default), or Record Complex option. This determines 
        the type of information that is qualified.</p>
      <p>When the Record Complex option is installed on an MDK index in a child 
        table, it treats the index as if it belongs to the parent table. When 
        rows are qualified in the child table, Omnidex returns primary keys for 
        the parent table.</p>
      <p>Depending on the indexing option, this domain type qualifies the following:<br>
      </p>
      <table width="100%" border="0" cellspacing="0" cellpadding="0">
        <tr> 
          <td><p>Installation</p></td>
          <td><p>Strategy Qualifies </p></td>
        </tr>
        <tr> 
          <td><p>SI with RS installed</p></td>
          <td><p>If qualifying from the child table, child rows with the ability 
              to access parent rows are qualified.</p>
            <p>If qualifying from the parent table, parent rows are qualified.</p></td>
        </tr>
        <tr> 
          <td><p>SI with RC installed</p></td>
          <td><p>Parent rows are qualified, regardless of the type of table used 
              in qualify.</p></td>
        </tr>
      </table>
      <p> Child tables placed in a domain let you quickly join to the parent table 
        or to other child tables in the same domain. For example, you could search 
        an ACTION index to qualify ACTIVITY child rows. You could then select 
        and fetch those rows, or you could quickly join to ACTIVITY&#8217;s Omnidex 
        parent table, CUSTOMERS, and select and fetch the corresponding parent 
        rows.</p>
      <p>The index, or key column, like CUSTOMER_NO, that prejoins child rows 
        to their unique Omnidex parent row by a common value is called a link 
        field. This column must have been declared as a PRIMARY KEY in the parent 
        table, and a FOREIGN KEY in any child tables that you want to prejoin 
        to the parent. You can prejoin a child table to any parent tables that 
        meet these criteria.</p>
      <p>You can join a child table to several parents, creating a multi-domain 
        child. Doing so increases the efficiency of searches across tables and 
        domains. You can use the multi-domain child to perform multi-domain qualifications 
        that begin in one domain but return information from a second domain.</p>
      <p>Using our sample database ORDERS, for example, you could find all customers 
        in Idaho that ordered items between April 1 and June 30, then use the 
        qualified list to join to the PRODUCTS domain and return the PRODUCT NAME 
        for each product ordered. The resulting list would contain customers in 
        Idaho who ordered a product between April 1 and June 30 along with the 
        name of the product they ordered.</p>
      <p>You can still perform multi-domain qualifications without having a multi-domain 
        child, although it may not have optimized performance.</p>
      <p>The cost of prejoining a child table to several parents is a need to 
        install a separate set of MDK indexes on the child for each domain where 
        the child was linked. When inserting, deleting or updating rows of a child 
        linked to several domains, OmniAccess must also update the MDK indexes 
        for each domain. This can impact update performance. Also, reloading all 
        MDK indexes for that child requires a B (Build) operation on all the domains 
        where the child is linked.</p>
      <p>Multi-find performance has been greatly improved and may be the preferred 
        join method over an RS domain, depending on the database. See the <a href="Sorted%20Multi-Find.htm">Sorted 
        Multi-Find</a> section for information on which to choose.</p>
      <p>&nbsp; </p>
      <p>&nbsp; </p>
      <p>&nbsp;</p>
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