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The parsing stage of query processing consumes resources, and ideally you should parse just once and use the same parsed version of the statement for repeated executions. Parsing is a much more expensive operation than executing the statement. You should use bind variables in SQL statements instead of literal values to reduce the amount of parsing in the database. Bind variables should be identical in terms of their name, data type, and length. Failure to use bind variables leads to heavy use of the shared pool area and, more often than not, contention for latches and a general slowing down of the database when a large number of queries are being processed. Sometimes your application may not be changeable into a form where bind variables are used. In 20, you ll see how to use Oracle configuration parameters to force statements that fail to use bind variables to do so.



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Views have several benefits to offer, but faster performance may not necessarily be one of them. Views are useful when you want to present only the relevant portions of a table to an application or a user. Whenever you query a view, it has to be instantiated at that time. Because the view is just a SQL query, it has to perform this instantiation if you want to query the view again. If your query uses joins on views, it could lead to substantial time for executing the query.

Tools panel or by ensuring that a check mark is present under View Snapping Snap to Objects. Snapping helps the placement of shape hints significantly.





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Full table scans can occur sometimes, even when you have indexed a table. The use of functions on indexed columns is a good example for when you unwittingly can cause Oracle to skip indexes and go to a full table scan. You should avoid the use of inequality and the greater than or equal to predicates, as they may also bypass indexes.

5. Drag and snap a circle to the lower-left corner of the letter s upper serif, as shown in Figure 7-12.

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Performance tuning involves the optimization of SQL code and the calibration of the resources used by Oracle. The developers generally perform SQL tuning, and the DBA merely facilitates their tuning efforts by setting the relevant initialization parameters, turning tracing on, and so on. Nevertheless, the DBA can implement several strategies to help improve SQL processing in his or her database. In some cases, you and the developers might be working together to optimize the application. What if you can t modify the code, as is the case when you re dealing with packaged applications Alternatively, what if even the developers are aware that major code changes are needed to improve performance, but time and budget constraints make the immediate revamping of the application difficult There are several ways you can help without having to change the code itself.

It s common for DBAs to bemoan the fact that the response times are slow because of poorly written SQL. I ve heard this in every place I ve worked, so I assume this is a universal complaint of DBAs who have to manage the consequences of bad code. A perfectly designed and coded application with all the right joins and smart indexing strategies would be nice, but more often than not, that perfect state of affairs doesn t happen. The theory of the next best option dictates that you should do everything you can to optimize within the limitations imposed by the application design. That said, let s look at some of the important ways in which you can help improve query performance in an application, even when you can t change the code right away.

Figure 7-12. Positioning a shape hint This next point is important: what you ve done is placed one half of a shape hint pair. The other half the partner is on the next keyframe, frame 35.

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