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Re: query optimization

From: Julius Tuskenis <julius(at)nsoft(dot)lt>
To: s(dot)borse(at)direction(dot)biz
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: query optimization
Date: 2008-07-10 10:39:05
Message-ID: 4875E6C9.3090706@nsoft.lt (view raw or flat)
Thread:
Lists: pgsql-admin
Please send the "explain analyze YOUR_QUERY" output after first run and 
later. Also please mention platform and pg version you are using.


Suresh Borse rašė:
>
> Good Afternoon !!!
>
> The view executes very faster for the first time.
>
> When I execute the view again and again suddenly it gets slow or it 
> gets hang.
>
> I have also traced the query plan but it changes for each 
> execution.Can we fix the query plan.
>
> I have also tested the view on my test machine but the result was same.
>
> The view contains multi-table joins.
>
> Warm Regards,
> Suresh Borse
>
>
>
> On Thu, 2008-07-10 at 12:25 +0300, Julius Tuskenis wrote:
>> Hello, Suresh
>>
>> Maybe its taking long for the first time, and then its faster? Did you 
>> noticed any circumstances under witch your query takes longer to execute?
>>
>>
>> Suresh Borse rašė:
>> > Dear All,
>> >
>> > I am facing very strange problem in postgres while executing the view.
>> >
>> > When I execute the view some times it takes few milliseconds, 
>> > sometimes it take several seconds and some times doesn't execute.
>> >
>> > I tried to troubleshoot using the explain plan method. But explain 
>> > plan also changes for each execution.
>> >
>> > Can anybody help me for troubleshooting  and for resolving the 
>> > performance issue.
>> >
>> >
>> > Thanks & Regards,
>> > Suresh Borse
>> >
>> >
>>
>>
>>     


-- 
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050


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