Function result Cache in oracle 11G

Question

Hi,
i am reading the following article and trying to reproduce same set of statements to learn about function result cache.
http://www.oracle.com/technology/oramag/oracle/07-sep/o57asktom.html
Details about my output:
SQL> create or replace
function not_cached
( p_owner in varchar2 )
return number
as
l_cnt number;
begin
select count(*)
into l_cnt
from t
where owner = p_owner;
sys.dbms_lock.sleep(1);
return l_cnt;
end;
Function created.
Elapsed: 00:00:00.13
SQL> create or replace
function cached
( p_owner in varchar2 )
return number
result_cache
relies_on(T)
as
l_cnt number;
begin
select count(*)
into l_cnt
from t
where owner = p_owner;
dbms_lock.sleep(1);
return l_cnt;
end;
Function created.
Elapsed: 00:00:00.08
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.06
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.01
SQL> SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> set serveroutput on
SQL> exec dbms_output.put_line( not_cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.02
SQL> SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
SQL> exec dbms_output.put_line( cached( 'SCOTT' ) );
0
PL/SQL procedure successfully completed.
Elapsed: 00:00:01.01
I am supposed to get the results quickly for "cached" call. However, i still dont see any change in the response time. May i know what i am missing here?
Thank you
Giridhar

Answer 1

Try to play with
RESULT_CACHE_MAX_SIZE
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams206.htm#REFRN10272
RESULT_CACHE_MAX_RESULT
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/initparams205.htm#REFRN10298