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Whenever you have to work with problems like this, there are usually several different approaches you could take, and the easiest demonstration of what s going on here is to run the query with the 10053 trace event enabled. When you examine the trace file, you find that Oracle is simply working out the usual index access cost to get at the leaf blocks of the two indexes, with no special scaling factor, and no little extra add-on to allow for the bitmap conversion (to rowids). After that, the cost of the hash join is simply the normal costing for hash joins (which you will see in 12). An alternative strategy to determine that Oracle is simply using the normal index costing is to use dbms_stats.set_index_stats to adjust the index statistics. Add 10 to the blevel of one index, and the total cost of the query goes up by 10; adjust the number of leaf_blocks in an index by an amount that should add 10 to the index cost, and it adds 10 to the total cost of the query.

vb.net code 39 reader

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Figure 4-8. The DataSet object model The data in a DataSet object can be inserted, updated, and deleted, and the object retains the details of any such modifications. However, being a generic, disconnected store for data, the DataSet object is completely unaware of the data source, which means that a dataset can be created from a database, a file, or programmatically, and it will always remain independent from the original source.

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vb.net code 39 reader

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The connection between the data provider-agnostic DataSet and a specific database store is the responsibility of another object in the ADO.NET architecture: the data adapter. The data adapter is data provider-specific. Each data provider contains its own data adapter version: SqlDataAdapter, OleDbDataAdapter, OracleDataAdapter, and so on. The data adapter s job is to handle the process of filling the DataSet with data from a database and post changes back to that database. The data adapter uses command objects to retrieve data from a database and later to post changes (insertions, updates, or deletions) back to it. Figure 4-9 diagrams the interaction between these objects.

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Bitmap indexes lose information about data scattering, so the optimizer has to invent some numbers As soon as the optimizer uses hard-coded constants in place of real information, it is inevitable that some of your queries will do the wrong thing I am still not sure of the exact formulae used by Oracle for costing bitmap access there may even be bugs in the costing algorithms that make the costing unstable I think the notes and approximations of this chapter should be sufficient to give you a reasonable idea of how the optimizer is going to behave, but there seems to be a surprising fudge factor that depends on the value of db_file_multiblock_read_count.

ubreports are an important feature of a report-generating tool. They enable you to create more complex reports and simplify the design work. Subreports are very useful when creating master-detail reports or when the structure of a single report is not sufficient to describe the complexity of the desired output document.

When you move from traditional costing to CPU costing, you may see some execution plans change dramatically, and others stay largely the same but run more slowly because an extra bitmap index has been used (perhaps unnecessarily) to filter data out When you combine bitmap indexes, the optimizer seems to report a cost based on the cost of just the cheapest relevant index instead of the cost of the indexes actually used This has some odd side effects that may mean some queries do too much work because an inappropriate set of indexes has been picked It is possible that the apparent bugs in the calculations are actually a deliberate design choice that is supposed to incur high numbers of logical I/Os against bitmap indexes to save on small numbers of physical I/Os against tables.

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vb.net code 39 reader