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Given that the meaning of some of the statistics (and in particular the clustering_factor) is different for bitmap indexes, what effect does that have on the estimated cost of using the index Try a simple column = constant query on each of the columns n6, n5, n4, and n3 in turn. The columns all have the same number of distinct values, so the results we get from running autotrace against the four queries may be very informative. Here are the four execution plans from a 9.2.0.6 system: Execution Plan - (n6: B-tree index on clustered column) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=54 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=54 Card=400 Bytes=5600) 2 1 INDEX (RANGE SCAN) OF 'T1_I6' (NON-UNIQUE) (Cost=9 Card=400) Execution Plan - (n5: B-tree index on scattered column) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=170 Card=400 Bytes=5600) 1 0 TABLE ACCESS (FULL) OF 'T1' (Cost=170 Card=400 Bytes=5600) Execution Plan - (n4: bitmap index on clustered column) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=114 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=114 Card=400 Bytes=5600) 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP INDEX (SINGLE VALUE) OF 'T1_I4' Execution Plan - (n3: bitmap index on scattered column) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=117 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=117 Card=400 Bytes=5600) 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP INDEX (SINGLE VALUE) OF 'T1_I3' You probably weren t surprised to see that the queries against the columns with B-tree indexes had different execution plans for the clustered data (where the index is considered to be reasonably effective) and the scattered data (where the index is considered to be a waste of space).

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Parsing a JRXML file into a JasperDesign object can be done using one of the methods published by this class. Applications might need to do this in cases where report templates kept in their source form (JRXML) must be modified at runtime based on some user input and then compiled on the fly for filling with data.

This feature improves your productivity, because you don t need to worry about getting the names and indexes of tables and fields right If you get them wrong, IntelliSense (and the compiler itself) will tell you about it! Furthermore, the values in the columns of a typed dataset also have properly defined types, making it impossible to (say) assign a string to a column that s expecting an integer..

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But the costs from the two bitmap indexes are nearly identical, regardless of whether the target data is extremely scattered, or very densely packed. (It is a nuisance that the optimizer doesn t report any cost against bitmap indexes this is a critical bit of useful information that is also missing from the explain plan and can only be found in 10053 trace files.) Of course, looking at the statistics available for the two bitmap indexes, it s not really surprising that the costs given for the two paths are about the same there isn t really anything in the statistics that describes the way that the data is distributed through the table. (You may think the factor of 7 difference in the leaf_block counts should mean something, and there is an element of truth in this, but it s not really a good indicator. In this example, that factor is large because of my artificial 90% free space declaration.) So, where does the calculated cost come from for bitmap indexes I can tell you part of the answer, and approximate another part but this is where my warning about accuracy and bugs starts to have effect.

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A typed dataset can be generated from a data adapter component that s been placed on a web form Provided that it has a valid SelectCommand assigned, you can right-click it and choose the Generate Dataset option, and a typed dataset will be created based on the structure of the information that s retrieved by the command You can give the new dataset a name and choose to add an instance of it to the current form, in order to use it immediately Going through this process creates a schema for the dataset that contains a definition of its structure (such as tables, columns, and their types) in a file that has an xsd extension This file is an XML document with a special format (also known as an XML language), which we will examine more closely in 7.

Rerun the queries with event 10053 enabled to show the CBO calculation, and you will find the following details in the trace files (this example is from a 9i system): For the query n3 = 2 bitmap on scattered data --------------------------------------------Access path: index (equal) Index: T1_I3 TABLE: T1 RSC_CPU: 0 RSC_IO: 3 IX_SEL: 4.0000e-002 TB_SEL: 4.0000e-002 ******** Bitmap access path accepted ******** Cost: 117 Cost_io: 117 Cost_cpu: 0.000000 Selectivity: 0.040000 Not believed to be index-only. BEST_CST: 116.54 PATH: 20 Degree: 1

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