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Extra resources for An Implementation of Key-Based Digital Signal Steganography
A larger value causes hash join costs to be cheaper, giving more hash joins. This parameter rarely needs to be changed. 9, Po2(n)=largest power of 2 that is smaller than n, and C = (Hash Multi-block I/O Count)*(Database Block Size). Optimizer Index Cost Adjustment Description Lets you adjust the costing of index access paths in the cost-based optimizer. Tuning Considerations This parameter makes the optimizer more or less prone to selecting an index access path over a full table scan. The default for this parameter is 100 percent, which makes the optimizer cost index access paths at the regular cost.
Although it can choose between hundreds of possible approaches much faster than any individual SQL programmer, the programmer might have essential information about the application’s nature or environment that the optimizer lacks. The optimizer is an excellent aid, but it cannot make as good a decision as an experienced SQL programmer. SQL Analyze lets you adjust environmental information and compare different optimizer modes and execution plans, helping you to determine the most efficient way to execute your SQL statements.
Oracle SQL Analyze shows you the values of these parameters in two locations: ■ ■ The Instance-based Initialization Parameters View shows you parameters that cannot be changed within Oracle SQL Analyze. The Session-based Initialization Parameters View shows you parameters that can edited to simulate different database environments for the purposes of testing different tuning scenarios. Instance-based Initialization parameters are further discussed on page 5-2. Session-based Initialization parameters are discussed on page 5-7.