Hi all,
i am trying to move my app from M$sql to PGsql, but i need a bit of help
:)
Except from all the other good advises about partitioning the dataset and
such there is another aspect to keep in mind. When you have a large
dataset and your queries become IO-bound the tuple density is going
Kevin Grittner wrote:
Jesper Krogh jes...@krogh.cc wrote:
Sorry if it is obvious.. but what filesystem/OS are you using and
do you have BBU-writeback on the main data catalog also?
Sorry for not providing more context.
ATHENA:/var/pgsql/data # uname -a
Linux ATHENA
Just a heads up - apparently the more recent Dell RAID controllers will no
longer recognise hard discs that weren't sold through Dell.
http://www.channelregister.co.uk/2010/02/10/dell_perc_11th_gen_qualified_hdds_only/
As one of the comments points out, that kind of makes them no longer SATA
On Wed, Feb 10, 2010 at 8:52 PM, Bryce Nesbitt bry...@obviously.com wrote:
If you guys succeed in making this class of query perform, you'll have beat
out the professional consulting firm we hired, which was all but useless!
The query is usually slow, but particular combinations of words seem
Dave Crooke wrote:
On Wed, Feb 10, 2010 at 5:30 PM, Jon Lewison jlewis...@gmail.com
mailto:jlewis...@gmail.com wrote:
Just a nit, but Oracle implements MVCC. 90% of the databases out
there do.
Sorry, I spoke imprecisely. What I meant was the difference in how the
rows are
On Thu, Feb 11, 2010 at 4:29 AM, Bruce Momjian br...@momjian.us wrote:
Kevin Grittner wrote:
Jesper Krogh jes...@krogh.cc wrote:
Sorry if it is obvious.. but what filesystem/OS are you using and
do you have BBU-writeback on the main data catalog also?
Sorry for not providing more context.
On Thu, 2010-02-11 at 12:39 +, Matthew Wakeling wrote:
Just a heads up - apparently the more recent Dell RAID controllers will no
longer recognise hard discs that weren't sold through Dell.
http://www.channelregister.co.uk/2010/02/10/dell_perc_11th_gen_qualified_hdds_only/
As one of
On Thu, Feb 11, 2010 at 5:39 AM, Matthew Wakeling matt...@flymine.org wrote:
Just a heads up - apparently the more recent Dell RAID controllers will no
longer recognise hard discs that weren't sold through Dell.
Kevin Grittner kevin.gritt...@wicourts.gov wrote:
Jesper Krogh jes...@krogh.cc wrote:
Sorry if it is obvious.. but what filesystem/OS are you using and
do you have BBU-writeback on the main data catalog also?
File system is xfs noatime,nobarrier for all data; OS is on ext3.
I *think*
Kevin Grittner wrote:
Another example of why I shouldn't trust my memory. Per the
hardware tech:
OS: /dev/sda is RAID1 - 2 x 2.5 15k SAS disk
pg_xlog: /dev/sdb is RAID1 - 2 x 2.5 15k SAS disk
These reside on a ServeRAID-MR10k controller with 256MB BB cache.
* Alvaro Herrera alvhe...@commandprompt.com [100211 12:58]:
Hmm, so maybe the performance benefit is not from it being on a separate
array, but from it being RAID1 instead of RAID5?
Or the cumulative effects of:
1) Dedicated spindles/Raid1
2) More BBU cache available (I can't imagine the OS
Aidan Van Dyk ai...@highrise.ca wrote:
Alvaro Herrera alvhe...@commandprompt.com wrote:
Hmm, so maybe the performance benefit is not from it being on a
separate array, but from it being RAID1 instead of RAID5?
Or the cumulative effects of:
1) Dedicated spindles/Raid1
2) More BBU cache
2010/2/11 James Mansion ja...@mansionfamily.plus.com:
Matthew Wakeling wrote:
Just a heads up - apparently the more recent Dell RAID controllers will no
longer recognise hard discs that weren't sold through Dell.
On Thu, Feb 11, 2010 at 1:11 PM, James Mansion
ja...@mansionfamily.plus.com wrote:
Matthew Wakeling wrote:
Just a heads up - apparently the more recent Dell RAID controllers will no
longer recognise hard discs that weren't sold through Dell.
Matthew Wakeling wrote:
Just a heads up - apparently the more recent Dell RAID controllers
will no longer recognise hard discs that weren't sold through Dell.
http://www.channelregister.co.uk/2010/02/10/dell_perc_11th_gen_qualified_hdds_only/
As one of the comments points out, that kind
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