| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: Interesting PL/SQL Puzzle
The question was not if it's a good or bad code. The question was why?
This is not the actual code that runs, just something that explains the
issue :)
So let's make it more interesting:
Let's keep the proc size unchanged while moving the end-if closer to the main if clause, and changing if false --> if true. Also let's make it return without trying all the code below.
It does not speed up, still nine times slower!!
Here is the proc:
CREATE OR REPLACE PROCEDURE IA.test_plsql2 (var1 in out varchar2, var2 in out varchar2, out1 in out varchar2, out2 in out varchar2) as
pat1 varchar2(1000) := '%tttttttttttttttttt%'; pat2 varchar2(1000) := 'lllllllllllllllllllllll'; pat3 varchar2(1000) := '%dfddddddddddddddddddiii%'; pat4 varchar2(1000) := 'yyyyyyyyyyyyyyyyyyyyyyyyy';begin
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
--
if var1 like pat3
then
if var2 like pat1
then
out1 := pat2;
else
out1 := pat4;
end if;
end if;
--
end;
/
-----Original Message-----
Sent: Monday, November 10, 2003 5:34 PM
To: Multiple recipients of list ORACLE-L
Hi!
NAME SHARABLE_MEM
----------- ------------
TEST_PLSQL1 185607 TEST_PLSQL5 9123
A lot of junk, right? :)
PL/SQL engine works with interpretive code, it does not have any optimizations -- here I do simplify, so do not consider this statement as an absolute truth -- like, e.g. most of the C compilers have. It has its own rules that are not clear, usually. dbms_profiler won't help here (It could mislead, however. For a good example see recent post of Raj), IMHO. As I told:
"I would suggest to consider some simple things:
. standard Oracle and your application's package(s) dependencies
. proper datatypes usage
"
These two things are simple but important.
So, I would sugget to change it to (sorry for dirty coding):
CREATE OR REPLACE PACKAGE test
IS
PROCEDURE test_plsql2 (
var1 in out varchar2
, var2 in out varchar2 , out1 in out varchar2 , out2 in out varchar2
pat1 CONSTANT varchar2(1000) := '%tttttttttttttttttt%';
pat2 CONSTANT varchar2(1000) := 'lllllllllllllllllllllll';
pat3 CONSTANT varchar2(1000) := '%dfddddddddddddddddddiii%';
pat4 CONSTANT varchar2(1000) := 'yyyyyyyyyyyyyyyyyyyyyyyyy';
ls VARCHAR2(1000);
b1 BOOLEAN;
b2 BOOLEAN;
PROCEDURE test_plsql2 (
var1 in out varchar2
, var2 in out varchar2
if false
then
b1 := var1 LIKE pat3;
b2 := var2 LIKE pat1;
--
if b1
then
if b2
then
ls := pat2;
else
ls := pat4;
end if;
end if;
.
out1 := ls;
END;
or something alike, hope you get the idea. On my system it gives:
00:01:28.12 vs 00:00:08.60.
> When I looked at the C code generated by the native compilation, I was not > very pleased the way native compilation works.
I think this statement of yours does answer your original question -- bad PL/SQL coding --> bad NC results.
HTH,
--
Vladimir Begun
The statements and opinions expressed here are my own and
do not necessarily represent those of Oracle Corporation.
Khedr, Waleed wrote:
> Below are two dummy procs that are good enough to explain the issue (Jared > forgive me for posting this big code). > All the code in proc test_plsql1 is inside an IF clause that will not run.[...]
> proc test_3 ran 30 million times in 9 minutes while test_2 ran in 20 > minutes. > Also test_2 required more CPU resources while running. > > Also I tried native compilation, which did not do a lot (only 10 %faster).
> When I looked at the C code generated by the native compilation, I was not > very pleased the way native compilation works. > > Does anybody have a clue why? > > I tried to include the proc in a package and pin it but there was no > difference.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Vladimir Begun
INET: Vladimir.Begun_at_oracle.com
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting servicesto: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting servicesto: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Mon Nov 10 2003 - 21:29:26 CST
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
 |
 |