RE: ZFS snapshots

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_at_singnet.com.sg] Sent: Tuesday, December 12, 2006 10:20 AM To: Donahue, Adam; oracle-l_at_freelists.org 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

-- 
This message may contain confidential, proprietary, or legally privileged information. No confidentiality or privilege is waived by any transmission to an unintended recipient. If you are not an intended recipient, please notify the sender and delete this message immediately. Any views expressed in this message are those of the sender, not those of any entity within the KBC Financial Products group of companies (together referred to as "KBC FP"). 

This message does not create any obligation, contractual or otherwise, on the part of KBC FP. It is not an offer (or solicitation of an offer) of, or a recommendation to buy or sell, any financial product. Any prices or other values included in this message are indicative only, and do not necessarily represent current market prices, prices at which KBC FP would enter into a transaction, or prices at which similar transactions may be carried on KBC FP's own books. The information contained in this message is provided "as is", without representations or warranties, express or implied, of any kind. Past performance is not indicative of future returns.

--
http://www.freelists.org/webpage/oracle-l