From: | kah_hang_ang(at)toray(dot)com(dot)my |
---|---|
To: | "Jan Cruz" <malebug(at)gmail(dot)com>, "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: statement stuck when the connection grew up to 45 or more |
Date: | 2006-06-09 09:29:08 |
Message-ID: | OF7A6ADED5.FD539DB4-ON48257188.003274C1@pengroup.com.my |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-bugs |
I had check using ps -auxw|grep postgres & using select * from
pg_stat_activity
and it shows that the is really running and use 99% of the CPU.
Is there any wrong with the query?
As suggested by Jan Cruz, it is to fine tune the performance of the query.
Even if I not fine tune the query it should able to run without problem.
What I not understand is why this query stuck when the connection growth up
to certain limit.
I did try execute the query with the connection more than 45 and it really
stuck there.
I wait for around 10 minutes but it still running.
I kill about 10 connections then the query start to run and finish within
30 sec.
May I know what will be the possible cause of this problem?
Regards,
KH Ang
"Jan Cruz"
<malebug(at)gmail(dot)com> To: "Qingqing Zhou" <zhouqq(at)cs(dot)toronto(dot)edu>
Sent by: cc: pgsql-bugs(at)postgresql(dot)org
pgsql-bugs-owner(at)pos Subject: Re: [BUGS] statement stuck when the connection grew up to 45 or more
tgresql.org
06/02/2006 03:08 PM
This is the statement which having problem:
select count(distinct empno) as counter1 from pay_master_history
where empno in (select empno from pay_batch_basic_history where
organizationid like '015003%')
and processyear = '2006'
and processmonth = '05'
and processbatch = '1'
SELECT COUNT (*) FROM (
SELECT empno as counter1 from pay_master_history as a
INNER JOIN (select empno from pay_batch_basic_history where organizationid
like '015003%' and processyear = '2006'
and processmonth = '05'
and processbatch = '1') as b
ON b.empno = a.empno ) as count_result
-----------------------------
or just create the view and use inner join then count :b
From | Date | Subject | |
---|---|---|---|
Next Message | Dirk Lutzebäck | 2006-06-09 13:25:55 | How to set the global OID counter? COPY WITH OIDS does not set global OID counter? |
Previous Message | Bruce Momjian | 2006-06-09 02:40:30 | Re: Fix for Win32 division involving INT_MIN |