At which column i will create index ????

Question

my query is as follows and please tell me at which column of the table i would create an index
select code, detail, nvl(sum(dr)-sum(cr),0) from spda
where sdate < '01-feb-09'
order by codebecause the query result very slow as there is above 3 million record in a table
Regards
M. Laeeque A.
Edited by: MLA on Feb 27, 2009 12:02 PM

Answer 1

MLA wrote:
my query is as follows and please tell me at which column of the table i would create an index
select code, detail, nvl(sum(dr)-sum(cr),0) from spda
where and sdate < '01-feb-09'because the query result very slow as there is above 3 million record in a tableYou've posted this request three times (with three different versions of above statement).
Which one would you like to get replied to?
If this is the nested subquery that is part of the query posted here: Query Response Very Slow
you should consider that the nested subquery is correlated to the outer query by this additional predicate:
WHERE  SUBSTR(spda.mcode,1,2) || '-' || SUBSTR(spda.mcode,3,4) =
                SUBSTR(ac.code,1,2)    || '-' || SUBSTR(ac.code,3,4)So in order to optimize the nested subquery access path this should be taken into account.
As I've already pointed out in the other thread, getting rid of the nested subquery and instead using regular joins probably offers the best performance.
Regards,
Randolf
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