RE: SQL question: possible to improve performance in these functi

From: Nicoll, Iain (Calanais) <iain.nicoll_at_calanais.com>
Date: Mon, 07 May 2001 04:12:31 -0700
Message-ID: <F001.002FA88C.20010507040522@fatcity.com>

In the first function couldn't you try using an exists ie

select '' from dual
where exists (select '' from my_table

              where id = v_id
              and   my_date_field > sysdate - 30)

Might be quicker if a lot of rows fit the id criteria. Would need to handle the exeption when nothing brought back though.

-----Original Message-----
Sent: 05 May 2001 01:21
To: Multiple recipients of list ORACLE-L functi

All I can think of is to pin these functions in the SHARED POOL using DBMS_SHARED_POOL.KEEP procedure !!

-----Original Message-----
Sent: Friday, May 04, 2001 3:06 PM
To: Multiple recipients of list ORACLE-L functions?

Oracle : 8.0.5
Platform : Sun

Is there any way to "optimize" the following two functions to improve speed?

I am calling this type of functions a lot.

Thanks.

function fTest1 (v_id in number) return boolean is   v_date date;
BEGIN
  select max(my_date_field) into v_date from my_table where id= v_id;   if v_date > sysdate - 30 then return true; else return false; end if; EXCEPTION
  when others then return false;
END fTest1;

function fTest2 (v_id in number) return varchar2 is

   text varchar2(32000);
  cursor cur1 is
   select my_text_field from my_table where id= v_id;

BEGIN for x in cur1 loop

text := text || chr(10) || x.my_text_field ; end loop;

return text;

END fTest2;

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