can you post

explain <your slow update query>

so we can see what it does ?


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.

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].

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Dave Cramer
519 939 0336

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