This third installment looks at database independence, the impact of standards, features and functions, and solving problems simply. This manuscript is Chapter 1 'Developing Successful Oracle Applications' from the Wrox Press book Expert One on One: Oracl
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Database Oracle Expert One-on-One: Oracle: Part 3 Tutorial
you might be able to see where I'm going in this section. I have made references above to other databases and how features are implemented differently in each. With the exception of some read-only applications, it is my contention that building a wholly database-independent application that is highly scalable is extremely hard ? and is in fact quite impossible unless you know exactly how each database works in great detail.
For example, let's revisit our initial resource scheduler example (prior to adding the FOR UPDATE clause). Let's say this application had been developed on a database with an entirely different locking/concurrency model from Oracle. What I'll show here is that if you migrate your application from one database to another database you will have to verify that it still works correctly in these different environments.
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