144 lines
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HTML
144 lines
10 KiB
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Database monitor performance analysis example 2" />
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<meta name="abstract" content="Similar to the preceding example that showed which SQL applications were implemented with table scans, the following example shows all queries that are implemented with table scans." />
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<meta name="description" content="Similar to the preceding example that showed which SQL applications were implemented with table scans, the following example shows all queries that are implemented with table scans." />
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<meta name="DC.subject" content="performance analysis, example 2, examples, output, all queries that performed table scans, table scans, output for all queries" />
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<meta name="keywords" content="performance analysis, example 2, examples, output, all queries that performed table scans, table scans, output for all queries" />
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<meta name="DC.Relation" scheme="URI" content="dbmonexamples.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Database monitor performance analysis example 2</title>
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</head>
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<body id="rzajqmon2"><a name="rzajqmon2"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Database monitor performance analysis example 2</h1>
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<div><p>Similar to the preceding example that showed which SQL applications
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were implemented with table scans, the following example shows all queries
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that are implemented with table scans.</p>
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<div class="section"><pre><strong>SELECT</strong> A.System_Table_Schema, A.System_Table_Name,
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A.Table_Total_Rows, A.Index_Advised,
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B.Open_Id, B.Open_Time,
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C.Clock_Time_to_Return_All_Rows, C.Number_Rows_Returned, D.Result_Rows,
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(D.End_Timestamp - D.Start_Timestamp) <strong>AS</strong> TOT_TIME,
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D.Statement_Text_Long
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<strong>FROM</strong> LIB/QQQ3000 A <strong>INNER JOIN</strong> LIB/QQQ3014 B
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<strong>ON</strong> (A.Join_Column = B.Join_Column AND
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A.Unique_Count = B.Unique_Count)
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<strong>LEFT OUTER JOIN</strong> LIB/QQQ3019 C
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<strong>ON</strong> (A.Join_Column = C.Join_Column AND A.Unique_Count = C.Unique_Count)
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<strong>LEFT OUTER JOIN</strong> LIB/QQQ1000 D
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<strong>ON</strong> (A.Join_Column = D.Join_Column AND A.Unique_Count = D.Unique_Count)</pre>
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</div>
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<div class="section"><div class="p">In this example, the output for all queries that performed table
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scans are shown in the table below. <div class="note"><span class="notetitle">Note:</span> The columns selected from table
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QQQ1000 do return NULL default values if the query was not executed
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using SQL. For this example assume the default value for character data is
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blanks and the default value for numeric data is an asterisk (*).</div>
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</div>
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</div>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<a name="rzajqmon2__altbsc"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzajqmon2__altbsc" width="100%" border="0"><caption>Table 1. Output
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for All Queries that Performed Table Scans</caption><thead align="left"><tr><th align="left" valign="bottom" width="7.2106261859582546%" id="d0e80">Lib Name</th>
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<th align="left" valign="bottom" width="7.400379506641366%" id="d0e82">Table Name</th>
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<th align="left" valign="bottom" width="7.400379506641366%" id="d0e84">Total Rows</th>
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<th align="left" valign="bottom" width="9.867172675521822%" id="d0e86">Index Advised</th>
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<th align="left" valign="bottom" width="7.7798861480075905%" id="d0e88">Query OPNID</th>
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<th align="left" valign="bottom" width="7.7798861480075905%" id="d0e90">ODP Open Time</th>
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<th align="left" valign="bottom" width="7.400379506641366%" id="d0e92">Clock Time</th>
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<th align="left" valign="bottom" width="7.7798861480075905%" id="d0e94">Recs Rtned</th>
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<th align="left" valign="bottom" width="7.7798861480075905%" id="d0e96">Rows Rtned</th>
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<th align="left" valign="bottom" width="7.400379506641366%" id="d0e98">TOT_ TIME</th>
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<th align="left" valign="bottom" width="22.2011385199241%" id="d0e100">Statement Text</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="7.2106261859582546%" headers="d0e80 "><strong>LIB1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e82 "><strong>TBL1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e84 "><strong>20000</strong></td>
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<td align="left" valign="top" width="9.867172675521822%" headers="d0e86 "><strong>Y</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e88 "><strong></strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e90 "><strong>1.1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e92 "><strong>4.7</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e94 "><strong>10</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e96 "><strong>10</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e98 "><strong>6.2</strong></td>
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<td align="left" valign="top" width="22.2011385199241%" headers="d0e100 "><pre>SELECT *
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FROM LIB1/TBL1
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WHERE FLD1 = 'A'</pre>
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</td>
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</tr>
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<tr><td align="left" valign="top" width="7.2106261859582546%" headers="d0e80 "><strong>LIB1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e82 "><strong>TBL2</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e84 "><strong>100</strong></td>
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<td align="left" valign="top" width="9.867172675521822%" headers="d0e86 "><strong>N</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e88 "><strong></strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e90 "><strong>0.1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e92 "><strong>0.7</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e94 "><strong>100</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e96 "><strong>100</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e98 "><strong>0.9</strong></td>
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<td align="left" valign="top" width="22.2011385199241%" headers="d0e100 "><pre>SELECT *
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FROM LIB1/TBL2</pre>
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</td>
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</tr>
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<tr><td align="left" valign="top" width="7.2106261859582546%" headers="d0e80 "><strong>LIB1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e82 "><strong>TBL1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e84 "><strong>20000</strong></td>
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<td align="left" valign="top" width="9.867172675521822%" headers="d0e86 "><strong>Y</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e88 "><strong></strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e90 "><strong>2.6</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e92 "><strong>4.4</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e94 "><strong>32</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e96 "><strong>32</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e98 "><strong>7.1</strong></td>
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<td align="left" valign="top" width="22.2011385199241%" headers="d0e100 "><pre>SELECT *
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FROM LIB1/TBL1
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WHERE FLD1 = 'A'
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AND FLD2 > 9000</pre>
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</td>
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</tr>
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<tr><td align="left" valign="top" width="7.2106261859582546%" headers="d0e80 "><strong>LIB1</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e82 "><strong>TBL4</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e84 "><strong>4000</strong></td>
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<td align="left" valign="top" width="9.867172675521822%" headers="d0e86 "><strong>N</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e88 "><strong>QRY04</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e90 "><strong>1.2</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e92 "><strong>4.2</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e94 "><strong>724</strong></td>
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<td align="left" valign="top" width="7.7798861480075905%" headers="d0e96 "><strong>*</strong></td>
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<td align="left" valign="top" width="7.400379506641366%" headers="d0e98 "><strong>*</strong></td>
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<td align="left" valign="top" width="22.2011385199241%" headers="d0e100 "><strong>*</strong></td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<div class="section"><p>If the SQL statement text is not needed, joining to table QQQ1000
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is not necessary. You can determine the total time and rows selected from
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data in the QQQ3014 and QQQ3019 rows.</p>
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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="dbmonexamples.htm" title="The iSeries navigator interface provides a powerful tool for gathering and analyzing performance monitor data using database monitor. However, you may want to do your own analysis of the database monitor files.">Database monitor examples</a></div>
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</div>
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</div>
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</body>
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</html>
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