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    <td align="right" class="bar"> <!-- InstanceBeginEditable name="Section Title" -->
      <h1>Omnidex Concepts</h1>
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      <p><a href="#notes">Notes</a></p>
      <p><a href="#parent">Indexing Parent Tables</a></p>
      <p><a href="#child">Indexing Child Tables</a></p>
      <p><a href="#idlist">ID List Indexing</a></p>
      <p class="line">&nbsp;</p>
      <p>Indexing Strategies</p>
      <p><a href="Domains/Domains.htm">Domains</a></p>
      <p>&nbsp;</p>
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      <h2>Indexing Strategies</h2>
      <p>Omnidex indexes can be delineated into two major sections. Multi-Dimensional 
        Keyword (MDK) Indexes and Aggregation/Sorted Key (ASK) Indexes.</p>
      <ul>
        <li>MDK Indexes provide a very powerful and flexible means of accessing 
          data. Individual data values in a column are indexed as keywords, allowing 
          data to be qualified for retrieval based on keyword values or partial 
          keyword values, without knowing the primary key or rowid. They also 
          support progressive, or &#8220;drill-down&#8221;, searches. </li>
        <li>Aggregation/Sorted Key (ASK) Indexes provide sorted retrieval capabilities 
          as well as aggregation index retrieval speeds unparalled by normal dbms 
          aggregations. Data is retrieved in sorted order based on key values 
          without knowing the native key or rowid. ASK indexes are used for sorted 
          retrievals, range retrievals, high-speed aggregations, and comparison 
          operations.</li>
      </ul>
      <p>Composite indexes use part of a column or a combination or columns in 
        an index. They can be created from both MDK and ASK indexes to give some 
        additional flexibility when performing searches.</p>
      <p>There are two special ASK composite indexes:</p>
      <p>Index-only access composite indexes allow high speed searches and data 
        warehousing installations. <br>
        Aggregate indexes quickly display sums, averages, counts, and minimum 
        or maximum values for a group of rows. <br>
        An installation can include any or all index types. The types of indexes 
        installed depends on the the questions most commonly asked.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="notes" id="notes"></a>Notes</h3>
      <ul>
        <li>In DBINSTAL, when using the SEQROW Build option, retrievals will be 
          restricted to only aggregations; detail data is not available. </li>
        <li>The SEQROW option will be made obsolete in a future version of Omnidex. 
        </li>
        <li>Re-build the indexes using DBINSTAL when online updates increase the 
          size of the database by 20% or more. This process repacks the indexes 
          and optimizes retrieval performance. </li>
        <li>If using Zoned fields which contain dates and other character oriented 
          data, use DBINSTAL to typecast the field to character (type=X) so that 
          the Omnidex ODBC driver can treat the field as a text field. </li>
        <li>If using a redefinable row ID in a table, create a native index on 
          the redefinable row ID to simplify the indexing process and facilitate 
          more efficient retrieval. </li>
        <li>Use a sequentially ascending 4-byte integer (in the Omnidex Environment, 
          Integer Length 4) for the Omnidex ID and the table primary key for maximum 
          indexing and retrieval performance. Omnidex uses this key as the row 
          ID. </li>
        <li>Use the Bitmap (;BM) indexing option when the cardinality is less 
          than 30. </li>
        <li>Use the Bitmap (;BM) indexing option only when the indexes can be 
          maintained as a batch process. </li>
        <li>Avoid using ANSI SQL2 reserved words for column or table names, or 
          for Omnidex composite index names. </li>
        <li>If SQL reserved words are used in column or table names, the names 
          must appear in quotation marks in calls to the OmniAccess API. </li>
        <li>Use different Environment logical names for each Environment Catalog 
          if multiple Environment Catalogs will be accessed by the same program.</li>
      </ul>
      <p class="line">&nbsp;</p>
      <h3><a name="parent"></a>Indexing Parent Tables</h3>
      <p>Parent tables typically contain rows that are each uniquely identifiable 
        by the value in one column (the primary key). There is a one-to-one relationship 
        between each unique identifying value in this column and the row that 
        contains that value. </p>
      <p>For example, in a CUSTOMERS table, each row is identified by a unique 
        number in CUSTOMER_NO. CUSTOMERS is considered a parent table, and CUSTOMER_NO 
        is its primary key.</p>
      <p>The primary key for each parent table is defined in the environment catalog 
        as a KEY declaration in the TABLE definition.</p>
      <p>Installing an MDK (Multi-Dimensional Keyword) index on a single parent 
        table creates an <a href="../Indexing%20Strategies/Domains/Domains.htm">SI 
        domain</a>. 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="child"></a>Indexing Child Tables</h3>
      <p>Unlike a parent table, child table rows may share the same value for 
        any given column. A child table does not usually have a unique key field, 
        meaning that a value in any given field can occur in any or all rows in 
        the child table.</p>
      <p>A child table has a field that &quot;links&quot; it to the key field 
        in a parent table and usually has a one-to-many relationship with the 
        parent table.</p>
      <p>For example, the ORDERS child table contains order entry information 
        for customers defined in the CUSTOMERS parent table. The tables are linked 
        by the common field, CUSTOMER_NO.</p>
      <p>However, while the CUSTOMERS parent table can have only one row containing 
        a specific customer number, the ORDERS child table may contain several 
        rows with that customer number or several orders for that customer.</p>
      <p>A child table can be indexed:</p>
      <ul>
        <li>as a DR (detail record) domain (preferred). This indexes the child 
          table as a stand-alone table, similar to a parent table's SI domain, 
          without prejoining the child table to the parent table. The child and 
          parent tables must be manually joined for qualifys and selects.</li>
        <li>in an SI (Search Item) with RS (Record Specific)(default) domain. 
          This prejoins the child table to the parent table. Qualifies rows in 
          the child table with the ability to access parent rows based on the 
          child table qualification.</li>
        <li>in an SI (Search Item) with RC (Record Complex) domain. This prejoins 
          the child table to the parent table. Returns only parent rows, no matter 
          where the qualification was performed, child table or parent table.</li>
        <li>as a Hybrid DR domain. </li>
        <li>as a DR domain </li>
        <li>in an RS domain </li>
        <li>as a Hybrid DR (a variation of a multi-domain child)</li>
      </ul>
      <p class="line">&nbsp;</p>
      <h3><a name="idlist"></a>ID List Indexing</h3>
      <p>ID List Indexing is the default and is better for performance if more 
        than 30 unique values are in the data base. Id List Indexing is more space 
        efficient if more than 20 unique values are in the data base. Id List 
        Indexing can also be more efficient on less than 30 unique values if only 
        a percentage of the rows contain a value.</p>
      <p>&nbsp;</p>
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