RE: ZFS snapshots
- From: "Donahue, Adam" <Adam.Donahue@xxxxxxxxx>
- To: "Hemant K Chitale" <hkchital@xxxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 12 Dec 2006 10:27:40 -0500
I replied privately, but I don't think this step is strictly necessary -
nor desired, as we'd then lose our ability to perform PITR to any SCN
within the backup window, no?
Adam
-----Original Message-----
From: Hemant K Chitale [mailto:hkchital@xxxxxxxxxxxxxx]
Sent: Tuesday, December 12, 2006 10:20 AM
To: Donahue, Adam; oracle-l@xxxxxxxxxxxxx
Subject: RE: ZFS snapshots
You would still be recommended to run
ALTER TABLESPACE (DATABASE in 10g) BEGIN BACKUP .. before you take
the Snapshot
and
ALTER TABLESPACE (DATABASE) END BACKUP followed by ALTER SYSTEM
ARCHIVE LOG CURRENT after the Snapshot.
Hemant
At 10:58 PM Tuesday, Donahue, Adam wrote:
>Well, a ZFS snapshot is atomic - meaning, it's not like copying a
>datafile in that it doesn't read things block-by-block, meaning the
>file can change underneath you while you copy it. Instead, because
>of the way ZFS works, it merely marks an existing "uberblock" to be
>preserved, which is a single, atomic state of the filesystem as of a
>given time.
>
>I admit it's not clean - even if it works. But I'm curious if I'm
>missing something that would make it not work at all in some cases.
>
>Adam
Hemant K Chitale
http://web.singnet.com.sg/~hkchital
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