General formula in Oracle 10g

Question

Hi,
I use Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod.
I want to develop a way to deal with complex expressions using SQL. I can't use listagg, so I use xmlagg. I created a query, which runs within 8-15 secs. It returns 20000 rows. When I slightly modify the query (should run within 80-150 secs and return 200000 rows), it keeps running and running... Is it because I use XML functions (I don't really understand the way XML functions work, I only use it)? I put these two queries in question separated by lines. Any hints on how to improve the performance of the query wouldl be appreciated. Any hints on how to replace the complex replace expression in the query would be also great.
Thanks,
Gabor
How to make it look like a code? How can I display the /[B/] (but without /) expression in the code?
with dim_mut as (select 1 as mut_id, '([A]+)-([C]+[D])' as keplet from dual
union select 2 as mut_id, '([A]+[B])*([C]+[D])' as keplet from dual
), dim_mut_komp as (
select 1 as mut_id,1 as mut_komp_id,1 as mut_sorszam,'[A]' as mut_azonosito from dual
union select 1,2,2,'[B]' from dual
union select 1,3,3,'[C]' from dual
union select 1,4,4,'[D]' from dual
union select 2,5,1,'[A]' from dual
union select 2,6,2,'[B]' from dual
union select 2,7,3,'[C]' from dual
union select 2,8,4,'[D]' from dual
), sp8 as (select 1 as mut_komp_id from dual
union select 2 from dual
union select 3 from dual
union select 4 from dual
union select 5 from dual
union select 6 from dual
union select 7 from dual
union select 8 from dual),
sp10 as (select 0 as sorszam from dual
union select 1 from dual
union select 2 from dual
union select 3 from dual
union select 4 from dual
union select 5 from dual
union select 6 from dual
union select 7 from dual
union select 8 from dual
union select 9 from dual),
dim_mut_value as
select /*+ no_merge */s1.mut_komp_id,
s2.sorszam+s3.sorszam*10+s4.sorszam*100+s5.sorszam*1000 as sorszam,
ceil(dbms_random.value(1,100)) as ertek
from sp8 s1,
sp10 s2,
sp10 s3,
sp10 s4,
sp10 s5
select count(*) from (
select
replace(
replace(
replace(
replace(
keplet,
substr(azonositok,1,instr(azonositok,';',1,1)-1),
substr(ertekek,1,instr(ertekek,';',1,1)-1)
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1),
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1))
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)),
substr(ertekek,instr(ertekek,';',1,2)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2))
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)),
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3))
) as kifejezes,
substr(azonositok,1,instr(azonositok,';',1,1)-1) as azonosito1,
substr(ertekek,1,instr(ertekek,';',1,1)-1) as ertek1
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1) as azonosito2,
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1)) as ertek2
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)) as azonosito3,
substr(ertekek,instr(ertekek,';',2,1)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2)) as ertek3
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)) as azonosito4,
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3)) as ertek4,
keplet,
ertekek,
azonositok,
dbms_aw.eval_number(
replace(
replace(
replace(
replace(
keplet,
substr(azonositok,1,instr(azonositok,';',1,1)-1),
substr(ertekek,1,instr(ertekek,';',1,1)-1)
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1),
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1))
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)),
substr(ertekek,instr(ertekek,';',1,2)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2))
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)),
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3))
) as vegeredmeny
from (
select m.mut_id,
mv.sorszam,
xmlagg(xmlelement(e,mv.ertek||';') order by mk.mut_sorszam).extract('//text()') as ertekek,
xmlagg(xmlelement(e,mk.mut_azonosito||';') order by mk.mut_sorszam).extract('//text()') as azonositok,
m.keplet
from dim_mut m,
dim_mut_komp mk,
dim_mut_value mv
where m.mut_id=mk.mut_id and mk.mut_komp_id=mv.mut_komp_id
group by m.mut_id,m.keplet, mv.sorszam
with dim_mut as (select 1 as mut_id, '([A]+[B])-([C]+[D])' as keplet from dual
union select 2 as mut_id, '([A]+[B])*([C]+[D])' as keplet from dual
), dim_mut_komp as (
select 1 as mut_id,1 as mut_komp_id,1 as mut_sorszam,'[A]' as mut_azonosito from dual
union select 1,2,2,'[B]' from dual
union select 1,3,3,'[C]' from dual
union select 1,4,4,'[D]' from dual
union select 2,5,1,'[A]' from dual
union select 2,6,2,'[B]' from dual
union select 2,7,3,'[C]' from dual
union select 2,8,4,'[D]' from dual
), sp8 as (select 1 as mut_komp_id from dual
union select 2 from dual
union select 3 from dual
union select 4 from dual
union select 5 from dual
union select 6 from dual
union select 7 from dual
union select 8 from dual),
sp10 as (select 0 as sorszam from dual
union select 1 from dual
union select 2 from dual
union select 3 from dual
union select 4 from dual
union select 5 from dual
union select 6 from dual
union select 7 from dual
union select 8 from dual
union select 9 from dual),
dim_mut_value as
select /*+ no_merge */s1.mut_komp_id,
s2.sorszam+s3.sorszam*10+s4.sorszam*100+s5.sorszam*1000+s6.sorszam*10000 as sorszam,
ceil(dbms_random.value(1,100)) as ertek
from sp8 s1,
sp10 s2,
sp10 s3,
sp10 s4,
sp10 s5,
sp10 s6
select count(*) from (
select
replace(
replace(
replace(
replace(
keplet,
substr(azonositok,1,instr(azonositok,';',1,1)-1),
substr(ertekek,1,instr(ertekek,';',1,1)-1)
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1),
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1))
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)),
substr(ertekek,instr(ertekek,';',1,2)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2))
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)),
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3))
) as kifejezes,
substr(azonositok,1,instr(azonositok,';',1,1)-1) as azonosito1,
substr(ertekek,1,instr(ertekek,';',1,1)-1) as ertek1
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1) as azonosito2,
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1)) as ertek2
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)) as azonosito3,
substr(ertekek,instr(ertekek,';',2,1)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2)) as ertek3
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)) as azonosito4,
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3)) as ertek4,
keplet,
ertekek,
azonositok,
dbms_aw.eval_number(
replace(
replace(
replace(
replace(
keplet,
substr(azonositok,1,instr(azonositok,';',1,1)-1),
substr(ertekek,1,instr(ertekek,';',1,1)-1)
substr(azonositok,instr(azonositok,';',1,1)+1,instr(azonositok,';',1,2)-instr(azonositok,';',1,1)-1),
substr(ertekek,instr(ertekek,';',1,1)+1,instr(ertekek,';',1,2)-1-instr(ertekek,';',1,1))
substr(azonositok,instr(azonositok,';',1,2)+1,instr(azonositok,';',1,3)-1-instr(azonositok,';',1,2)),
substr(ertekek,instr(ertekek,';',1,2)+1,instr(ertekek,';',1,3)-1-instr(ertekek,';',1,2))
substr(azonositok,instr(azonositok,';',1,3)+1,instr(azonositok,';',1,4)-1-instr(azonositok,';',1,3)),
substr(ertekek,instr(ertekek,';',1,3)+1,instr(ertekek,';',1,4)-1-instr(ertekek,';',1,3))
) as vegeredmeny
from (
select m.mut_id,
mv.sorszam,
xmlagg(xmlelement(e,mv.ertek||';') order by mk.mut_sorszam).extract('//text()') as ertekek,
xmlagg(xmlelement(e,mk.mut_azonosito||';') order by mk.mut_sorszam).extract('//text()') as azonositok,
m.keplet
from dim_mut m,
dim_mut_komp mk,
dim_mut_value mv
where m.mut_id=mk.mut_id and mk.mut_komp_id=mv.mut_komp_id
group by m.mut_id,m.keplet, mv.sorszam
Edited by: BluShadow on 04-Oct-2012 09:12
added {noformat}{noformat} tags for code readability. Please read: {message:id=9360002} to learn to do this yourself.

Answer 1

The following links describe the new Text features in Oracle 10g and 11g.
http://download.oracle.com/docs/cd/B19306_01/text.102/b14218/whatsnew.htm#i969790
http://download.oracle.com/docs/cd/B28359_01/text.111/b28304/whatsnew.htm#sthref6