Magnus Hagander wrote:
On Thu, Jan 31, 2008 at 03:34:05PM +0100, Martijn van Oosterhout wrote:
On Thu, Jan 31, 2008 at 01:28:48PM +0000, Simon Riggs wrote:
That sentence has no place in any discussion about "backup" because the
risk is not just a few transactions, it is a corrupt and inconsistent
database from which both old and new data would be inaccessible.
Hmm? I thought the whole point of a filesystem snapshot was that it's
the same as if the system crashed. And I was fairly sure we could
recover from that...
That was my assumption as well. *Assuming* that the filesystem snapshot is
consistent. There are a bunch of solutions that don't do consistent
snapshots between different partitions, so if your WAL or one tablespace is
on a different partition, you'll get corruption anyway... (seen this in
Big Commercial Database, so that's not a pg problem)
Agreed. That's why I made it a point to mention that all of your
tablespaces should be on the same file system... In hindsight, I should
have also stated that your WAL logs should be on the same file system as
well...
--
Chander Ganesan
Open Technology Group, Inc.
One Copley Parkway, Suite 210
Morrisville, NC 27560
919-463-0999/877-258-8987
http://www.otg-nc.com
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