How to optimize your PL/SQL code

To increase performance of your pl/sql, you should alter system plsql parameters. It is recommended to use separate parameter value for production and development. For development, the parameter are set to default. So for development plsql_code_type will be 'INTERPRETED' and plsql_optimize_level will be 2. For production environment, you should change the parameter in following way,

alter session set plsql_code_type = 'NATIVE';

alter session set plsql_optimize_level = 3;

One very important effect of setting these two parameters is that - without setting these parameters in such values, you cannot use your function in parallel query.

If your functions are deterministic, you can create function index to increase performance. Thus you can enhance plsql performance.