[PERFORM] Write performance

2010-06-24 Thread Janning
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, my fault. One disk for the system

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 have a 12 GB RAM machine with intel i7-975 and using 3

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, ST31500341AS (1.5 TB) For each drive, you

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

2004-10-11 Thread Janning Vygen
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's datatypes do not match

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

2004-10-11 Thread Janning Vygen
doesn't need to consult the index if it has to read every page anyway. seq scan can be faster on small tables. try (in psql) SET enable_seqscan TO off; before running your query and see how postgres plans it without using seq scan. janning ---(end of broadcast

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 consult the index if it has to read every

[PERFORM] slow rule on update

2004-10-05 Thread Janning Vygen
. kind regards janning ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html

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

2004-08-04 Thread Janning Vygen
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 but when it comes to performance it is always