Thanks Kavi, People like you made this world more beautiful. I will
give it a try.
Original Message
Date: Thu, 22 Aug 2002 10:15:27 -0800
>Hi
>
>!. 'union's in general does take time and may not help improve your
>performance
> ( if you can find an alternative at this stage to replace that to
achieve
>the same
> query results - that would be great)
>2. You could run explain plan on this query t - get the query plan
> ( and check if there are lot full table scans which you think are
>expensive - try to
> avoid that by including appropriate index hint or by adding new
indexes
>)
>3 . Since you have lots of aggregate functions like (sum, decode, floor...
etc
>) and
> GROUP BY ====> this will be "SORT " intensive query - make sure all
the
>sorts
> are happening on the memory and not on the disk
> ( you could check that with tkprof statistics - as well )
>4. If any of the above needs to be expanded let me know (I can point to
some
>documentation
> which explains that or elabrate it to you , if you have metalink - you
>could search on
> that too : how to run get explain plan etc )
>
>Thanks,
>Kavi
>
>cw wrote:
>
>> I am a new oracle pl/sql developer. This is a very expensive query
and
>> it takes eight hours to produce a report. I just need some
validation
>> from guru's.
>> ----------------------------------------------
>> Original Message
>> Date: Thu, 22 Aug 2002 07:48:36 -0800
>>
>> >Hello,
>> >
>> >Did I miss portion of this email ?
>> >what help is needed for this query ? (tuning, explanation ....???)
>> >
>> >Thanks,
>> >Kavi
>> >
>> >cw wrote:
>> >
>> >> Hey list Guru, Can anyone help me with this query? Many thanks,
>> >>
>> >> SELECT
>> >> A.COUNTY_CODE,
>> >> C.COUNTY_NAME,
>> >> lpad(B.PRECINCT,4,' '),
>> >> count(*),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(18*12))/(1*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(19*12))/(11*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(30*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(40*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(50*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(60*12))/(5*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> A.DOB)-(65*12))/(10*99)),1,0)),
>> >> sum(decode(A.DOB, NULL, 1, 0))
>> >> FROM ONLINE_VOTERS A, ADDRESS_INDEX B, COUNTIES C
>> >> WHERE A.COUNTY_CODE = B.COUNTY_CODE
>> >> AND A.ADDRESS_ID = B.ADDRESS_ID
>> >> AND A.COUNTY_CODE = C.COUNTY_CODE
>> >> AND A.STATUS IN ('V','S')
>> >> GROUP BY A.COUNTY_CODE, C.COUNTY_NAME, lpad(B.PRECINCT,4,' ')
>> >> UNION ALL
>> >> SELECT
>> >> D.COUNTY_CODE,
>> >> C2.COUNTY_NAME,
>> >> lpad(D.PRECINCT,4,' '),
>> >> count(*),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(18*12))/(1*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(19*12))/(11*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(30*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(40*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(50*12))/(10*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(60*12))/(5*12)),1,0)),
>> >> sum(DECODE(0,floor((months_between(sysdate,
>> >> D.DOB)-(65*12))/(10*99)),1,0)),
>> >> sum(decode(D.DOB, NULL, 1, 0))
>> >> FROM OFFLINE_VOTERS D, COUNTIES C2
>> >> WHERE D.COUNTY_CODE = C2.COUNTY_CODE
>> >> AND D.STATUS IN ('V','S')
>> >> GROUP BY D.COUNTY_CODE, C2.COUNTY_NAME, lpad(D.PRECINCT,4,' ');
>> >>
>> >> _____________________________________________
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>>
>> _____________________________________________
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>> --
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>> Author: cw
>> INET: cw_at_netlimit.com
>>
>> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
>> San Diego, California -- Public Internet access / Mailing Lists
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>> To REMOVE yourself from this mailing list, send an E-Mail message
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>
>
Free email with personality! Over 200 domains!
http://www.MyOwnEmail.com
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: cw
INET: cw_at_netlimit.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Thu Aug 22 2002 - 13:44:50 CDT
