94 lines
4.9 KiB
HTML
94 lines
4.9 KiB
HTML
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<!DOCTYPE html
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<meta name="DC.Title" content="Comparing Binary radix indexes and Encoded vector indexes" />
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<meta name="abstract" content="DB2 UDB for iSeries makes indexes a powerful tool." />
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<meta name="description" content="DB2 UDB for iSeries makes indexes a powerful tool." />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Comparing Binary radix indexes and Encoded vector indexes</title>
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</head>
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<body id="rzajqradixevi"><a name="rzajqradixevi"><!-- --></a>
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<img src="./delta.gif" alt="Start of change" /><!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Comparing Binary radix indexes and Encoded vector indexes</h1>
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<div><p>DB2<sup>®</sup> UDB
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for iSeries™ makes
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indexes a powerful tool. </p>
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<p>The following table summarizes some of the differences between binary radix
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indexes and encoded vector indexes: </p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Comparison of radix and evi indexes</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e33"> </th>
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<th valign="bottom" id="d0e34">Binary Radix Indexes </th>
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<th valign="bottom" id="d0e36">Encoded Vector Indexes</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e33 ">Basic data structure</td>
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<td valign="top" headers="d0e34 ">A wide, flat tree</td>
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<td valign="top" headers="d0e36 ">A Symbol Table and a vector</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Interface for creating</td>
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<td valign="top" headers="d0e34 ">Command, SQL, iSeries Navigator</td>
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<td valign="top" headers="d0e36 ">SQL, iSeries Navigator</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Can be created in parallel</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Can be maintained in parallel</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used for statistics</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used for selection</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes, via dynamic bitmaps or RRN list</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used for joining</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes (in conjunction with a hash table) </td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used for grouping</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">Yes</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used for ordering</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">No</td>
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</tr>
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<tr><td valign="top" headers="d0e33 ">Used to enforce unique Referential Integrity constraints</td>
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<td valign="top" headers="d0e34 ">Yes</td>
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<td valign="top" headers="d0e36 ">No</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="efindex.htm" title="DB2 Universal Database for iSeries provides two basic means for accessing tables: a table scan and an index-based retrieval. Index-based retrieval is typically more efficient than table scan when less than 20% of the table rows are selected.">Creating an index strategy</a></div>
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</div>
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</div>
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<img src="./deltaend.gif" alt="End of change" /></body>
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</html>
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