There are two types of PL/SQL compilation. The first is interpreted compilation, which is the default. Interpreted compilation is done at run time. It is good for development.The other type of compilation is native compilation. It has better performance. Therefore it is better suited for a production setting. Compiled code is stored in the SYSTEM schema. You can enable this by setting PLSQL_CODE_TYPE to NATIVE on a session or system level.
Next time I will review some PL/SQL tuning techniques.
