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Home -> Community -> Mailing Lists -> Oracle-L -> RE: select count(*)
Have you also checked the HWM on the table.
Check the blocks allocated to the table.
Rajendra Pande
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ITI Infrastructure
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From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
On Behalf Of Sarma Aryasomayajula
Sent: Friday, October 06, 2006 11:10 AM
To: oracle-l_at_freelists.org
Subject: select count(*)
Hi!
I'm running the below query in PROD(10g R1) and ACPT(10g R2). the query returns in fraction of a second in PROD and, If I run the same query in ACPT, it's taking 30+ mins.
In Prod
<mailto:S5UVAD_at_powls01> S5UVAD_at_powls01 > set timin on S5UVAD_at_powls01 <mailto:S5UVAD_at_powls01> > select count(*) from wlcbs_master.rpt_08_vew where 0=1;
COUNT(*)
0
Elapsed: 00:00:00.07
S5UVAD_at_powls01 <mailto:S5UVAD_at_powls01> > sho user
In ACPT:
N7OTHA_at_AOWLS01 <mailto:N7OTHA_at_AOWLS01> > set timin on N7OTHA_at_AOWLS01 <mailto:N7OTHA_at_AOWLS01> > select count(*) from rpt_08_vew where 0=1;
COUNT(*)
0
Elapsed: 00:31:02.27
condition does it apply without reading the entire table?
2. If the same condition is applied on a view which is join of 3 big tables(paritioned)? How does oracle executes the query?
Can any one explain the above scenarious.
Regards,
Sarma
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Received on Fri Oct 06 2006 - 10:41:45 CDT
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