Functions and deterministic performance of gain.  What is the reality behind?

Hello Pros,

What is that we really can win using the deterministic function. I've seen some good examples of askthom and discussions. After reading these examples, I feel deterministic functions are rarely used and the benefits are neglected. Is my thoughts right? Requst the pro s to discuss on how used this deterministic function or how better can be used in the right places to take advantage of the performance.

[url http://asktom.oracle.com/pls/apex/f?p=100:11:0:P11_QUESTION_ID:1547006324238 #12928321943595] Example site asktom

Here is the link I had called and taken a few examples out of it.

Thanks in advance

You can also see the CBO in action (optimize SQL code and do not stuff that is not necessary to determine the final result).

Think the feature is actually executed when you use a SQL as follows? :-)

SQL> exec global.counter := 0;

PL/SQL procedure successfully completed.

SQL> select count(*) from (select SpecialFoo(level/level)  as X from dual connect by level <= 10000);

  COUNT(*)
----------
     10000

SQL> exec dbms_output.put_line( 'execution='||global.counter );
execution=0

PL/SQL procedure successfully completed.

SQL> 

Tags: Database

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