Download PDF by Thomas Kyte: Expert Oracle Database Architecture: Oracle Database 9i,

By Thomas Kyte

ISBN-10: 1430229462

ISBN-13: 9781430229469

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If you use literals (constants) in the query, then every query is a brand-new query, never before seen by the database. It will have to be parsed, qualified (names resolved), security-checked, optimized, and so on. In short, each and every unique statement you execute will have to be compiled every time it is executed. The second query uses a bind variable, :empno, the value of which is supplied at query execution time. This query is compiled once and then the query plan is stored in a shared pool (the library cache), from which it can be retrieved and reused.

How to measure performance. • How to see where the bottlenecks were. • How and what to index. And so on. At the end of the week the developers, who had been insulated from the database, were amazed at what the database could actually provide for them and how easy it was to get that information. Most importantly, they saw how big of a difference taking advantage of database features could make to the performance of their application. In the end, they were successful—just behind schedule by a couple of weeks.

Now this may seem like a long list of things to learn before you start, but consider this analogy for a second: if you were developing a highly scalable, enterprise application on a brand-new operating system (OS), what would be the first thing you’d do? ” If that wasn’t your answer, you’d most likely fail. Consider, for example, Windows vs. Linux. If you are a long-time Windows programmer and were asked to develop a new application on the Linux platform, you’d have to relearn a couple of things.

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Expert Oracle Database Architecture: Oracle Database 9i, 10g, and 11g Programming Techniques and Solutions, Second Edition by Thomas Kyte

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