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Execution Plan (9.2.0.6 autotrace first query - modified index) --------------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=7 Card=1 Bytes=14) 1 0 SORT (AGGREGATE) 2 1 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=7 Card=8 Bytes=112) 3 2 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=1 Card=8) And now here are execution plans for second query (before and after change), which highlight the disaster that can occur when the clustering_factor no longer represents the original purpose of the index: Execution Plan (9.2.0.6 autotrace second query - original index) ------------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=19 Card=60 Bytes=1320) 1 0 SORT (GROUP BY) (Cost=19 Card=60 Bytes=1320) 2 1 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=12 Card=500 Bytes=11000) 3 2 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=2 Card=500) Execution Plan (9.2.0.6 autotrace second query - modified index) --------------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=36 Card=60 Bytes=1320) 1 0 SORT (GROUP BY) (Cost=36 Card=60 Bytes=1320) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=29 Card=500 Bytes=11000) As you can see, the deceptively high clustering_factor has camouflaged the locality of the data, and the optimizer has switched from a precise indexed access path to a much more extravagant table scan. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. Figure 3-2. An HTML Table control on an empty web form In the Properties browser, you can change many aspects of the table, and you may recognize the names in the window (such as border, cellpadding, and cellspacing) as being the attributes of a traditional HTML table. When you add a control to a web form in the VS .NET designer, HTML code for the control is generated, and you can see (and modify) it by clicking the HTML button at the bottom of the designer. For the table shown in Figure 3-2, VS .NET would generate the following HTML: ... <body> <form id="Form1" method="post" runat="server"> <table id="Table1" cellSpacing="1" cellPadding="1" width="300" border="1"> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> </tr> <tr> <td></td> Look at the package dbms_stats. It contains two critical classes of procedures: get_xxx_stats and set_xxx_stats. For the purposes of this chapter, we are interested only in get_index_stats and set_index_stats. In principle, we can always adjust the clustering_factor of an index by a piece of PL/SQL that reads the statistics from the data dictionary, modifies some of them, and writes the modified values back to the data dictionary, for example (script hack_stats.sql in the online code suite): declare m_numrows m_numlblks m_numdist m_avglblk m_avgdblk m_clstfct m_indlevel begin dbms_stats.get_index_stats( ownname => NULL, indname => '{index_name}', numrows => m_numrows, numlblks => m_numlblks, numdist => m_numdist, avglblk => m_avglblk, avgdblk => m_avgdblk, clstfct => m_clstfct, indlevel => m_indlevel ); m_clsfct := {something completely different}; dbms_stats.set_index_stats( ownname => NULL, indname => '{index_name}', numrows => m_numrows, numlblks => m_numlblks, numdist => m_numdist, avglblk => m_avglblk, avgdblk => m_avgdblk, clstfct => m_clstfct, indlevel => m_indlevel ); end; / number; number; number; number; number; number; number; vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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