Re: Low Performance for big hospital server ..

Amrit,

can you post

explain <your slow update query>

so we can see what it does ?

Dave

amrit(at)health2(dot)moph(dot)go(dot)th wrote:

>>>Today is the first official day of this weeks and the system run
>>>better in serveral points but there are still some points that need to
>>>be corrected. Some queries or some tables are very slow. I think the
>>>queries inside the programe need to be rewrite.
>>>Now I put the sort mem to a little bit bigger:
>>>sort mem = 16384 increase the sort mem makes no effect on the
>>>slow point eventhough there is little connnection.
>>>shared_buffers = 27853
>>>effective cache = 120000
>>>
>>>
>
>
>
>> If I were you I would upgrade from RH 9 to Fedora Core 2 or 3 after
>> some initial testing. You'll see a huge improvement of speed on the
>> system as a whole. I would try turning hyperthreading off also.
>>
>>
>
>
>Now I turn hyperthreading off and readjust the conf . I found the bulb query
>that was :
>update one flag of the table [8 million records which I think not too much]
>.When I turned this query off everything went fine.
>I don't know whether update the data is much slower than insert [Postgresql
>7.3.2] and how could we improve the update method?
>Thanks for many helps.
>Amrit
>Thailand
>
>NB. I would like to give my appreciation to all of the volunteers from many
>countries who combat with big disaster [Tsunamies] in my country [Thailand].
>
>---------------------------(end of broadcast)---------------------------
>TIP 8: explain analyze is your friend
>
>
>
>

--
Dave Cramer
http://www.postgresintl.com
519 939 0336
ICQ#14675561