I have taken over the maintenance of a server farm , recently. 2 webserver
on db server. They are quite powerful 2 processor xeon w/ 6Gig of ram .
Couple of days ago we had a serious performance hit and the db server (pg.
v7.4) was overloaded w/ something in a way that operating system was almost
not able to respond or in cases it did not.
After some analysis i suspect that there is a query that takes up to 1
second and that is the cause. Upon each page loading this query fires and
takes the one second and blocks the page to load completly . The load was
roughly ~300 connections in one minute .
So here are my questions :
. Why does the second and the later queries take the whole on second
if the dataset is the same . Shouldn't PG realise that the query is the same
so i give the user the same resultset ?
. How do I know if one query blocks the other ?
. Is there a way to log the long running queries in 7.4 ? If not is
it available in any newer version ?
thanks for your help !
FITS Magyarország Kft.
Tel.:+36 30 4945862
Email: <mailto:falu(at)fits(dot)hu> falu(at)fits(dot)hu
Ingyenes videó tanfolyamok(Excel,Access,Word) :
pgsql-performance by date
|Next:||From: Claus Guttesen||Date: 2008-07-28 06:55:53|
|Subject: Re: how does pg handle concurrent queries and same queries|
|Previous:||From: Tom Lane||Date: 2008-07-27 00:36:00|
|Subject: Re: Using ENUM with huge NAMEDATALEN |