What You Need to Know
So, do you really need to remember everything in this chapter? I certainly hope not, because I can’t even remember it in my day-to-day work. Your database administrator, on the other hand, probably needs to know most of this stuff.
In addition to satisfying healthy curiosity, my goal in presenting this material was to help allay any misgivings programmers might have about the PL/SQL architecture. Whether or not you’ve ever had such concerns, there are a number of important points to remember about what goes on inside PL/SQL:
To avoid compilation overhead, programs you plan to use more than a few times should be put in stored programs rather than stored in files as anonymous blocks.
In addition to their unique ability to preserve state throughout a session, PL/SQL packages offer performance benefits. You should put most of your extensive application logic into package bodies.
When upgrading Oracle versions, new features in the PL/SQL compiler warrant thorough application testing. In some (probably rare) cases when upgrading to Oracle Database 11g, slight changes in execution order, resulting from freedoms exploited by the optimizing compiler, could affect application results.
While the Oracle database’s automatic dependency management approach relieves a huge burden on developers, upgrading applications on a live production database should be undertaken with great care because of the need for object locking and package state reset.
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