By Thomas Kyte
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Additional info for Expert Oracle Database Architecture: Oracle Database 9i, 10g, and 11g Programming Techniques and Solutions, Second Edition
Executing SQL statements without bind variables is very much like compiling a subroutine before each method call. Imagine shipping Java source code to your customers where, before calling a method in a class, they had to invoke the Java compiler, compile the class, run the method, and then throw away the byte code. Next time they wanted to execute the same method, they would do the same thing: compile it, run it, and throw it away. You would never consider doing this in your application; you should never consider doing this in your database either.
Rs_start PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc1 PL/SQL procedure successfully completed. rs_middle PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc2 PL/SQL procedure successfully completed. 31% of the time ■ Note You may not observe exactly the same values for cpu, nor in fact for any metric, as I report here. Differences will be caused by different Oracle versions, different operating systems, or different hardware platforms. The idea will be the same, but the exact numbers will undoubtedly be marginally different.
A development team needs at its heart a core of database-savvy coders who are responsible for ensuring the database logic is sound and the system is built to perform from day one. Tuning after the fact—tuning after deployment—means you did not build it that way. These may seem like surprisingly obvious statements, but in my experience, too many people approach the database as if it were a black box—something that they don’t need to know about. Maybe they have a SQL generator that will save them from the hardship of having to learn SQL.
Expert Oracle Database Architecture: Oracle Database 9i, 10g, and 11g Programming Techniques and Solutions, Second Edition by Thomas Kyte