350 lines
20 KiB
HTML
350 lines
20 KiB
HTML
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<meta name="DC.Title" content="Database monitor view 3028 - Grouping" />
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<meta name="DC.subject" content="summary row, grouping" />
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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 view 3028 - Grouping</title>
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</head>
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<body id="t3028"><a name="t3028"><!-- --></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">Database monitor view 3028 - Grouping</h1>
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<div><div class="example"> <pre><strong>Create View</strong> QQQ3028 as
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(<strong>SELECT</strong> QQRID as Row_ID,
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QQTIME as Time_Created,
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QQJFLD as Join_Column,
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QQRDBN as Relational_Database_Name,
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QQSYS as System_Name,
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QQJOB as Job_Name,
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QQUSER as Job_User,
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QQJNUM as Job_Number,
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QQI9 as Thread_ID,
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QQUCNT as Unique_Count,
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QQUDEF as User_Defined,
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QQQDTN as Unique_SubSelect_Number,
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QQQDTL as SubSelect_Nested_Level,
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QQMATN as Materialized_View_Subselect_Number,
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QQMATL as Materialized_View_Nested_Level,
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QVP15E as Materialized_View_Union_Level,
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QVP15A as Decomposed_Subselect_Number,
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QVP15B as Total_Number_Decomposed_SubSelects,
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QVP15C as Decomposed_SubSelect_Reason_Code,
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QVP15D as Starting_Decomposed_SubSelect,
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QVRCNT as Unique_Refresh_Counter,
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QVPARPF as Parallel_Prefetch,
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QVPARPL as Parallel_PreLoad,
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QVPARD as Parallel_Degree_Requested,
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QVPARU as Parallel_Degree_Used,
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QVPARRC as Parallel_Degree_Reason_Code,
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QQEPT as Estimated_Processing_Time,
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QVCTIM as Estimated_Cumulative_Time,
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QQREST as Estimated_Rows_Selected,
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QQAJN as Estimated_Join_Rows,
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QQJNP as Join_Position,
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QQI1 as DataSpace_Number,
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QQC21 as Join_Method,
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QQC22 as Join_Type,
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QQC23 as Join_Operator,
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QVJFANO as Join_Fanout,
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QVFILES as Join_Table_Count,
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QQC11 as GroupBy_Implementation,
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QQC101 as GroupBy_Index_Name,
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QQC102 as GroupBy_Index_Library,
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QVINAM as GroupBy_Index_Long_Name,
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QVILIB as GroupBy_Index_Long_Library,
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QQC12 as Has_Having_Selection,
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QQC13 as Having_to_Where_Selection_Conversion,
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QQI2 as Estimated_Number_of_Groups,
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QQI3 as Average_Number_Rows_per_Group,
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QVC3001 as GroupBy_Columns,
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QVC3002 as MIN_Columns,
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QVC3003 as MAX_Columns,
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QVC3004 as SUM_Columns,
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QVC3005 as COUNT_Columns,
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QVC3006 as AVG_Columns,
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QVC3007 as STDDEV_Columns,
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QVC3008 as VAR_Columns
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<strong>FROM</strong> UserLib/DBMONTable
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<strong>WHERE</strong> QQRID=3028) </pre>
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</div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 1. QQQ3028 - Grouping</caption><thead align="left"><tr><th align="left" valign="bottom" width="35.50863723608445%" id="d0e43">View Column Name</th>
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<th align="left" valign="bottom" width="11.324376199616124%" id="d0e45">Table Column Name</th>
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<th align="left" valign="bottom" width="53.16698656429942%" id="d0e47">Description</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Row_ID</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQRID</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Row identification </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Time_Created</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQTIME</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Time row was created </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Column</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQJFLD</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join column (unique per job)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Relational_Database_Name</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQRDBN</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Relational database name </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">System_Name</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQSYS</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">System name</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Job_Name</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQJOB</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Job name </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Job_User</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQUSER</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Job user </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Job_Number</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQJNUM</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Job number</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Thread_ID</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQI9</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Thread identifier </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Unique_Count</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQUCNT</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Unique count (unique per query)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">User_Defined</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQUDEF</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">User defined column </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Unique_SubSelect_Number</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQQDTN</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Unique subselect number</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">SubSelect_Nested_Level</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQQDTL</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Subselect nested level </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Materialized_View_Subselect_Number</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQMATN</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Materialized view subselect number </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Materialized_View_Nested_Level</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQMATL</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Materialized view nested level </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Materialized_View_Union_Level</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVP15E</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Materialized view union level</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Decomposed_Subselect_Number</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVP15A</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Decomposed query subselect number, unique across all
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decomposed subselects</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Total_Number_Decomposed_SubSelects</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVP15B</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Total number of decomposed subselects</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Decomposed_SubSelect_Reason_Code</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVP15C</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Decomposed query subselect reason code</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Starting_Decomposed_SubSelect</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVP15D</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Decomposed query subselect number for the first decomposed
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subselect</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Unique_Refresh_Counter</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVRCNT</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Unique refresh counter</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Parallel_Prefetch</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVPARPF</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Parallel Prefetch (Y/N) </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Parallel_PreLoad</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVPARPL</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Parallel Preload (index used)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Parallel_Degree_Requested</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVPARD</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Parallel degree requested (index used)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Parallel_Degree_Used</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVPARU</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Parallel degree used (index used)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Parallel_Degree_Reason_Code</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVPARRC</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Reason parallel processing was limited (index used)</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Estimated_Processing_Time</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQEPT</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Estimated processing time, in seconds</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Estimated_Cumulative_Time</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVCTIM</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Estimated cumulative time, in seconds</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Estimated_Rows_Selected</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQREST</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Estimated rows selected</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Estimated_Join_Rows</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQAJN</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Estimated number of joined rows</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Position</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQJNP</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join position</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">DataSpace_Number</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQI1</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Dataspace number</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Method</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC21</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join method - when available <ul><li>NL - Nested loop</li>
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<li>MF - Nested loop with selection</li>
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<li>HJ - Hash join</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Type</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC22</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join type - when available <ul><li>IN - Inner join</li>
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<li>PO - Left partial outer join</li>
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<li>EX - Exception join</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Operator</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC23</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join operator - when available <ul><li>EQ - Equal</li>
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<li>NE - Not equal</li>
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<li>GT - Greater than</li>
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<li>GE - Greater than or equal</li>
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<li>LT - Less than</li>
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<li>LE - Less than or equal</li>
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<li>CP - Cartesian product</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Fanout</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVJFANO</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Join fan out. Possible values are: <ul><li>N - Normal join situation where fanout is allowed and each matching row
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of the join fanout is returned.</li>
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<li>D - Distinct fanout. Join fanout is allowed however none of the join fanout
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rows are returned.</li>
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<li>U - Unique fanout. Join fanout is not allowed. Error situation if join
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fanout occurs.</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Join_Table_Count</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVFILES</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Number of tables joined</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Implementation</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC11</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Group by implementation <ul><li>' ' - No grouping</li>
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<li>I - Index</li>
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<li>H - Hash</li>
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</ul>
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</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Index_Name</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC101</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Index, or constraint, used for grouping</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Index_Library</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC102</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Library of index used for grouping </td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Index_Long_Name</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVINAM</td>
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<td valign="top" width="53.16698656429942%" headers="d0e47 ">Long name of index, or constraint, used for grouping</td>
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Index_Long_Library</td>
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<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVILIB </td>
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|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Long name of index, or constraint, library used for grouping</td>
|
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</tr>
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<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Has_Having_Selection</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC12</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Having selection exists (Y/N)</td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Having_to_Where_Selection_Conversion</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQC13</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Having to Where conversion (Y/N)</td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Estimated_Number_of_Groups</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQI2</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Estimated number of groups </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">Average_Number_Rows_per_Group</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QQI3</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Average number of rows in each group</td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">GroupBy_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3001 </td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">Grouping columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">MIN_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3002 </td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">MIN columns </td>
|
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</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">MAX_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3003 </td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">MAX columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">SUM_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3004 </td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">SUM columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">COUNT_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3005</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">COUNT columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">AVG_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3006</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">AVG columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">STDDEV_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3007</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">STDDEV columns </td>
|
|
</tr>
|
|
<tr><td valign="top" width="35.50863723608445%" headers="d0e43 ">VAR_Columns</td>
|
|
<td valign="top" width="11.324376199616124%" headers="d0e45 ">QVC3008</td>
|
|
<td valign="top" width="53.16698656429942%" headers="d0e47 ">VAR columns </td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</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="lofdds.htm" title="The following examples show the different optional SQL view format that you can create with the SQL shown. The column descriptions are explained in the tables following each example. These views are not shipped with the server, and you must create them, if you choose to do so. These views are optional and are not required for analyzing monitor data.">Optional database monitor SQL view format</a></div>
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</div>
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</div>
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