RE: Backups versus snapshots
- From: "Powell, Mark" <mark.powell2@xxxxxx>
- To: "Oracle-L@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 18 Sep 2014 18:41:20 +0000
It would appear that the reference warns to put the tablespace (or database)
into backup mode before issuing alter system suspend. I do not remember that
requirement from way back when but it makes sense.
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Powell, Mark
Sent: Thursday, September 18, 2014 1:41 PM
To: Oracle-L@xxxxxxxxxxxxx
Subject: RE: Backups versus snapshots
It depends on whose snapshot technology is in use if the database in place in
backup mode or not. One method would be to tell Oracle to suspend IO, make the
snapshot or break the mirror, and then to resume IO in Oracle.
http://docs.oracle.com/cd/E11882_01/server.112/e25494/start.htm#ADMIN11165
From: oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Seth Miller
Sent: Thursday, September 18, 2014 1:07 PM
To: kmoore@xxxxxxxxxxxx<mailto:kmoore@xxxxxxxxxxxx>
Cc: Kevin Closson; andrew.kerber@xxxxxxxxx<mailto:andrew.kerber@xxxxxxxxx>;
Oracle-L@xxxxxxxxxxxxx<mailto:Oracle-L@xxxxxxxxxxxxx>
Subject: Re: Backups versus snapshots
Is it safe to assume these snapshots are being taking with the database in
backup mode?
What is the procedure for restoring a non-critical datafile?
What is the procedure for repairing block corruption?
You don't have to be an old school DBA to have concerns about this. It's not
necessarily a bad thing to not have backups as long as everyone involved is
aware of and accepts the consequences and loss of functionality of not having
them.
Seth Miller
On Thu, Sep 18, 2014 at 11:46 AM, Keith Moore
<kmoore@xxxxxxxxxxxx<mailto:kmoore@xxxxxxxxxxxx>> wrote:
The purpose would be to have a backup if there is a catastrophic SAN failure.
I know EMC and other storage vendors like to think that cannot happen but I've
seen it four or five times over the years, mostly due to human error.
Your database is gone which makes the snapshot (if it still exists) invalid.
FYI, we will be using ExtremIO and there are a lot of good things about the
VBlock. I'm just not comfortable with having zero backups.
Keith
> great thread.
>
> In this specific model would the purpose of RMAN backup to make sure you're
> not backing up corrupt blocks?
>
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> Kevin Closson
> Chief Performance Architect - XtremIO
> EMC
>
>
> ________________________________
> From: Keith Moore <kmoore@xxxxxxxxxxxx<mailto:kmoore@xxxxxxxxxxxx>>
> To: andrew.kerber@xxxxxxxxx<mailto:andrew.kerber@xxxxxxxxx>
> Cc: "Oracle-L@xxxxxxxxxxxxx<mailto:Oracle-L@xxxxxxxxxxxxx>"
> <oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
> Sent: Thursday, September 18, 2014 9:17 AM
> Subject: Re: Backups versus snapshots
>
>
> I agree. They do not want to pay for the backup infrastructure so if that is
> the final decision by the architecture team, rman backups will not be an
> option.
>
>
>
>
>> Keep snapshots and rman backups. Belt and suspenders.
>>
>> Sent from my iPhone
>>
>
>
> --
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