[PERFORM] Write performance

2010-06-24 Thread Janning
est with 89 MB/s writing and 110MB/s reading. Can you give some hints, if this numbers seems to be reasonable? kind regards Janning -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance

Re: [PERFORM] Write performance

2010-06-24 Thread Janning
On Thursday 24 June 2010 14:53:57 Matthew Wakeling wrote: > On Thu, 24 Jun 2010, Janning wrote: > > We have a 12 GB RAM machine with intel i7-975 and using > > 3 disks "Seagate Barracuda 7200.11, ST31500341AS (1.5 GB)" > > Those discs are 1.5TB, not 1.5GB. sorry,

Re: [PERFORM] Write performance

2010-06-24 Thread Janning
thanks for your quick response, kenneth On Thursday 24 June 2010 14:47:34 you wrote: > On Thu, Jun 24, 2010 at 02:43:33PM +0200, Janning wrote: > > Hi, > > > > at the moment we encounter some performance problems with our database > > server. > > > > We hav

Re: [PERFORM] Write performance

2010-06-24 Thread Janning Vygen
On Thursday 24 June 2010 15:16:05 Janning wrote: > On Thursday 24 June 2010 14:53:57 Matthew Wakeling wrote: > > On Thu, 24 Jun 2010, Janning wrote: > > > We have a 12 GB RAM machine with intel i7-975 and using > > > 3 disks "Seagate Barracuda 7200.11, ST3150034

Re: [PERFORM] The black art of postgresql.conf tweaking

2004-08-04 Thread Janning Vygen
experience apache in standard configuration can be the main bottleneck. and teh combination of keepalive off, lingerd and mod_gzip is GREAT and i didn't found much sites propagating a configuration like this. kind regards, janning p.s: sorry for being slightly off topic and talking about apache b

Re: [PERFORM] EXPLAIN ANALYZE much slower than running query normally

2004-10-11 Thread Janning Vygen
d one will be much faster because of some or even all data needed to answer the query is still in the shared buffers. janning ---(end of broadcast)--- TIP 9: the planner will ignore your desire to choose an index scan if your joining column&

Re: [PERFORM] why my query is not using index??

2004-10-11 Thread Janning Vygen
it doesn't > 2nd query doing perfect as you see. postgres uses a seq scan if its faster. In your case postgres seems to know that most of your rows have a date < 2004-01-01 and so doesn't need to consult the index if it has to read every page anyway. seq scan

Re: [PERFORM] why my query is not using index??

2004-10-11 Thread Janning Vygen
Am Montag, 11. Oktober 2004 22:49 schrieb Francisco Reyes: > On Mon, 11 Oct 2004, Janning Vygen wrote: > > postgres uses a seq scan if its faster. In your case postgres seems to > > know that most of your rows have a date < 2004-01-01 and so doesn't need > > to consul

[PERFORM] slow rule on update

2004-10-05 Thread Janning Vygen
re to start research? My guess is that the update statement inside the rule doesnt really uses the index on punktecache, but i dont know why and i dont know how to change it. Any hint or help is is very appreciated. kind regards janning ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html