Steinar H. Gunderson wrote:
Hi,
We're having problems with our PostgreSQL server using forever for simple
queries, even when there's little load -- or rather, the transactions seem
to take forever to commit. We're using 8.1 (yay!) on a single Opteron, with
WAL on the system two-disk (software)
On Thu, Nov 10, 2005 at 02:14:30PM +, Richard Huxton wrote:
You're beyond my area of expertise, but I do know that someone's going
to ask what filesystem this is (ext2/xfs/etc).
Ah, yes, I forgot -- it's ext3. We're considering simply moving the WAL onto
a separate partition (with
On Thu, Nov 10, 2005 at 03:25:35PM +0100, Steinar H. Gunderson wrote:
Ah, yes, I forgot -- it's ext3. We're considering simply moving the WAL onto
a separate partition (with data=writeback and noatime) if that can help us
any.
There's no reason to use a journaled filesystem for the wal. Use
On Thu, 2005-11-10 at 08:43, Michael Stone wrote:
On Thu, Nov 10, 2005 at 03:25:35PM +0100, Steinar H. Gunderson wrote:
Ah, yes, I forgot -- it's ext3. We're considering simply moving the WAL onto
a separate partition (with data=writeback and noatime) if that can help us
any.
There's no
On Thu, Nov 10, 2005 at 09:52:38AM -0600, Scott Marlowe wrote:
Not from what I understood. Ext2 can't guarantee that your data will
even be there in any form after a crash.
It can if you sync the data. (Which is the whole point of the WAL.)
I believe only metadata journaling is needed
Scott Marlowe [EMAIL PROTECTED] writes:
On Thu, 2005-11-10 at 08:43, Michael Stone wrote:
There's no reason to use a journaled filesystem for the wal. Use ext2 in
preference to ext3.
Not from what I understood. Ext2 can't guarantee that your data will
even be there in any form after a
On Thu, 2005-11-10 at 10:39, Tom Lane wrote:
Scott Marlowe [EMAIL PROTECTED] writes:
On Thu, 2005-11-10 at 08:43, Michael Stone wrote:
There's no reason to use a journaled filesystem for the wal. Use ext2 in
preference to ext3.
Not from what I understood. Ext2 can't guarantee that your
On Thu, Nov 10, 2005 at 11:39:34AM -0500, Tom Lane wrote:
No, Mike is right: for WAL you shouldn't need any journaling. This is
because we zero out *and fsync* an entire WAL file before we ever
consider putting live WAL data in it. During live use of a WAL file,
its metadata is not changing.
Scott Marlowe [EMAIL PROTECTED] writes:
Thanks for the clarification! Nice to know I can setup an ext2
partition for my WAL files then. Is this in the docs anywhere?
Don't think so ... want to write something up? Hard part is to
figure out where to put it ...
On Thu, Nov 10, 2005 at 12:44:15PM -0500, Tom Lane wrote:
Don't think so ... want to write something up? Hard part is to
figure out where to put it ...
To be honest, I think we could use a newbie's guide to PostgreSQL
performance tuning. I've seen rather good guides for query tuning, and
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