On 12/05/2006, at 3:59 AM, Richard Elling wrote:
On Thu, 2006-05-11 at 10:27 -0700, Richard Elling wrote:
On Thu, 2006-05-11 at 10:31 -0600, Gregory Shaw wrote:
A couple of points/additions with regard to oracle in particular:
When talking about large database installations, copy-on-write may
or may not apply. The files are never completely rewritten, only
changed internally via mmap(). When you lay down your database, you
will generally allocate the storage for the anticipated capacity
required. That will result in sparse files in the actual
filesystems.
Sorry, I didn't receive Greg or Richard's original emails. Apologies
for messing up threading (such as it is).
Are you saying that copy-on-write doesn't apply for mmap changes, but
only file re-writes? I don't think that gels with anything else I
know about ZFS.
Boyd
Melbourne, Australia
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