Re: block chg tracking

From: Kenny Payton <>
Date: Mon, 16 Feb 2015 12:48:59 -0500
Message-ID: <>

I'm doing snapshots of our physical standby as backup for the primary database. This is separate storage from the primary database and provides the ability to do RMAN based restores/recoveries and possible switch over capabilities for dire situations.

As for retention, I do not have long term data preservation requirements but you can replicate snapshots offsite if needed.


On Mon, Feb 16, 2015 at 12:43 PM, Jeremy Schneider <> wrote:

> FWIW, this is partly a terminology thing, but I get a little nervous
> when people talk about "snapshot-only backups". Snapshots are awesome
> - can be very useful as an intermediate step as you've pointed out,
> and can also provide quick & easy rollback points (similar to
> flashback database) for maintenance operations. But personally I
> think that it's _so_ crucial to have some kind of backup on different
> physical media from your primary. (Even the FRA can be on the same
> physical disks if you're not attentive to SAN config details!)
> Relying on snapshots alone for backups - even with the most
> bullet-proof SAN - is really dangerous...
> my 2c... and yeah, i know, ancient oft-beaten dead horse... but it
> probably never hurts to mention it once more!
> On Mon, Feb 16, 2015 at 10:16 AM, Mladen Gogala
> <> wrote:
> >
> > Every four to six hours? Full backup is usually run on daily basis. And
> even
> > every 4 to 6 hours is possible, if the backup is SAN snapshot.
> >
> > That's why a lot of attention needs to be devoted for
> > scheduling, unless the full backup is actually a snapshot.
> >
> > what Kenny described is not a typical solution. Kenny
> > described the snapshot-only solution which doesn't include long term data
> > preservation, like the one mandated by SOX or HIPAA. Those solutions can
> be
> > combined. Also, please note that snapshots are fast. Running a full DB
> > backup as snapshot every 4 to 6 hours is not a problem. Note that once
> you
> > have snapshot, copying the files to tape can be done using file system
> > utilities like tar, cpio or rm (if 100% compression is needed). The only
> > remaining problem is the one of cataloging these backups and modern
> backup
> > utilities do that for you.
> rm does indeed provide the best compression i've ever seen. i'd
> forgotten just how useful it is!
> --
> --

Received on Mon Feb 16 2015 - 18:48:59 CET

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