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CHAPTER 1 DEVELOPING SUCCESSFUL ORACLE APPLICATIONS
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A natural extension of the argument that you shouldn t necessarily strive for database independence is the idea that you should understand exactly what your specific database has to offer and make full use of it. This section does not outline all of the features that Oracle 10g has to offer that would be an extremely large book in itself. The new features of Oracle 9i Release 1, 9i Release 2, and 10g Release 1 themselves fill a book in the Oracle documentation set. With about 10,000 pages of documentation provided by Oracle, covering each and every feature and function would be quite an undertaking. Rather, this section explores the benefits of getting at least a cursory knowledge of what is provided. As I ve said before, I answer questions about Oracle on http://asktom.oracle.com. I d say that 80 percent of my answers are simply URLs to the documentation (for every question you see that I ve published many of which are pointers into the documentation there are two more questions I chose not to publish, almost all of which are read this answers). People ask how they might go about writing some complex piece of functionality in the database (or outside of it), and I just point them to the place in the documentation that tells them how Oracle has already implemented it and how to use it. Replication comes up this way frequently. I ll receive the following question: I would like to keep a copy of my data elsewhere. I would like this to be a read-only copy. I need it to update only once a day at midnight. How can I write the code to do that The answer is as simple as a CREATE MATERIALIZED VIEW command. This is built-in functionality in the database. Actually, there are many ways to implement replication, from read-only materialized views, to updateable materialized views, to peer-to-peer replication, to streams-based replication. It is true that you can write your own replication it might even be fun to do so but at the end of the day, it would not be the smartest thing to do. The database does a lot of stuff. In general, the database can do it better than we can ourselves. Replication, for example, is internalized in the kernel, written in C. It s fast, it s fairly easy, and it s robust. It works across versions and across platforms. It is supported, so if you hit a problem, Oracle s support team will be glad to help. If you upgrade, replication will be supported there as well, probably with some new features. Now, consider if you were to develop your own. You would have to provide support for all of the versions you wanted to support. Interoperability between old and new releases This would be your job. If it breaks, you won t be calling support at least not until you can get a test case that is small enough to demonstrate your basic issue. When the new release of Oracle comes out, it will be up to you to migrate your replication code to that release. Not having a full understanding of what is available to you can come back to haunt you in the long run. I was working with some developers with years of experience developing database applications on other databases. They built analysis software (trending, reporting, and visualization software). It was to work on clinical data (healthcare related). They were not aware of SQL syntactical features such as inline views, analytic functions, and scalar subqueries. Their major problem was they needed to analyze data from a single parent table to two child tables. An entity-relationship diagram (ERD) might look like Figure 1-1.
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