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Up to now, we have discussed the need to write application code that performs well and does not make the database do unnecessary work. We have also seen how a solid grasp of PL/SQL and SQL will help you succeed in your quest to write high-performance applications. In this section, we will look at some general guidelines for achieving high performance in your applications.
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Know the Features Offered by Oracle
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Time and again, I have seen that developers don t take enough time to gain knowledge about the features offered by Oracle. This proves very costly as we reinvent the wheel by rewriting what has already been written by Oracle for us. In the past, I myself have been guilty of this. For example, in one of the systems I worked on, I needed to maintain a history of changes to records in a set of tables. It took my team about a man-month to write procedural code for this purpose before we realized that there is a feature called Workspace Management in Oracle that will do this for us already (see Oracle Application Developer's Guide Workspace Manager [10g Release 1] for more details). I was able to write pretty much the same code in half a day using the Workspace Management feature! Had I known about this feature earlier, I could have potentially saved the team at least that one man-month s worth of effort (assuming that the restrictions that this feature imposed were acceptable to our system).
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CHAPTER 2 ORACLE FUNDAMENTALS
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I have seen people routinely coding for features that are part of the Oracle database offering. Some common examples are Coding referential integrity in the application instead of using database features such as foreign keys Not using materialized views when applicable Creating query joins in the application layer (a very bad idea indeed) People recode features already available in Oracle for one or more of the following reasons: Unawareness of these features: This can be avoided by actively learning about Oracle. See Appendix B for a list of resources I recommend strongly. You can also learn a lot by attending conferences, joining Oracle user groups in your area, and reading the articles at http://otn.oracle.com. Fear of new features: Some people are wary of a new feature from a release-stability point of view. However, it s still worth reading up on and learning about new features and using them actively; otherwise, you ll continue to write the same code. (And don t forget that you may also introduce your own bugs.) In general, if you re about to write an application feature that seems like something that might already be present in Oracle, do some research on what Oracle offers before you jump in and start coding. Attitude problem (i.e., the mistaken belief that you could do a better job than Oracle): My philosophy is to trust the database to do its job well. If you reinvent code already written by Oracle, you ll inevitably spend lots of effort in writing code that performs terribly, is incorrect, and is hard to maintain. The time and effort you spend in learning a new Oracle feature will pay off many times over later on.
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Design to Optimize the Most Important Business Functions First
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Performance is all about making conscious trade-offs between various resources such as development time, hardware and software resources, customer requirements, etc. You should design in a way that the most important business needs of a user are given the highest priority in terms of meeting performance expectations. An excellent book that discusses this theme in great detail is Cary Millsap s Optimizing Oracle Performance (O Reilly, ISBN: 0-596-00527-X).
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Design in a way that the most important business needs of a user are given the highest priority in Tip
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