RE: Help on tkprof output

From: Sami <saminathans_at_myrealbox.com>
Date: Tue, 02 Dec 2003 19:34:25 -0800
Message-ID: <F001.005D8731.20031202193425@fatcity.com>

(select countryabbrev from c) subquery will have some more predicate (where clause) to restric few countries. Basically I don't want to select all the countries. For simplicity sake I remove those where clause(business logic). Anyway EXECUTION PLAN will not get changed.

-----Original Message-----

Biddell, Ian
Sent: Tuesday, December 02, 2003 9:54 PM To: Multiple recipients of list ORACLE-L

You full scans within the loops which are hitting the disks, ie.58730 which gives the big difference between cpu & elapsed as it's waiting for IO
Also why do you need
and p.business_country_id=c.countryabbrev

As well as
and p.business_country_id in ( select countryabbrev from c )

Do you want to join to table c for any reason or do you just want to see if the country abbreviation is in table c? At the moment you are doing both.

SO maybe fine tune the SQL to only do what you really need it to and your disk IO would go down along with your elapsed time.

Hth
Ian

-----Original Message-----

jaysingh1_at_optonline.net
Sent: Wednesday, 3 December 2003 9:49
To: Multiple recipients of list ORACLE-L

Hi Gurus,

Could someone shed some light on the following tkprof output.

To get 0 record it is aking more than 11 seconds. Also I see huge difference between CPU time and elapsed time even though the system is not so busy(It is a test machine. very low load on it). If you say it is waiting on something, could you tell me how to identify the wait event associated with this and how to rectify the same?

Also please let me know why the query count is very high?

select countryname, e.lastupdatedate

from e e, p p, c c
where p.pid = e.pid

    and p.hsbc_user_category='GIB'
    and p.business_country_id=c.countryabbrev
    and e.userstatusid in ( select userstatusid from userstatus )
    and p.business_country_id in ( select countryabbrev from c )

order by countryname, e.lastupdatedate desc

call count cpu elapsed disk query current rows

------ -------- ---------- ---------- ---------- ----------
Parse 2 0.07 0.08 0 0 0 0 Execute 2 0.00 0.02 0 0 0 0 Fetch 2 42.95 133.21 58730 118694 24 0
------ -------- ---------- ---------- ---------- ----------
total 6 43.02 133.31 58730 118694 24 0

Misses in library cache during parse: 1 Optimizer goal: CHOOSE
Parsing user id: 165

Rows Row Source Operation

--------------------------------------------------- 0 SORT ORDER BY 0 NESTED LOOPS 1 NESTED LOOPS 1590 HASH JOIN 239 TABLE ACCESS FULL c 1589 HASH JOIN 239 VIEW VW_NSO_1 239 SORT UNIQUE 239 INDEX FAST FULL SCAN (object id 76648) 1589 TABLE ACCESS FULL p 1589 TABLE ACCESS BY INDEX ROWID e 1589 INDEX UNIQUE SCAN (object id 76709) 0 INDEX UNIQUE SCAN (object id 76899)

OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS call count cpu elapsed disk query current rows

------ -------- ---------- ---------- ---------- ----------
Parse 4 0.07 0.08 0 0 0 0 Execute 5 0.00 0.05 0 0 0 2 Fetch 2 42.95 133.21 58730 118694 24 0
------ -------- ---------- ---------- ---------- ----------
total 11 43.02 133.34 58730 118694 24 2

Misses in library cache during parse: 1

Thanks
Jay

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Author: Biddell, Ian
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Author: Sami
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