RE: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - alternatives?

From: Upendra N <nupendra_at_hotmail.com>
Date: Tue, 6 Mar 2012 16:10:36 -0500
Message-ID: <BLU129-W1486E8221B8A88BFB5A3B6D8510_at_phx.gbl>


Chris,
Sometime ago I upgraded a database from 10g to 11g migrating from Sparc to Intel. Because the database needed HA, we picked up Oracle Streams as the choice, the entire downtime for the hardware/OS/Oracle version migration was <30 mins.

We used datapump to migrate the initial data and to keep up with the changes Oracle Streams was used. You may want to check out the datatype exclusions in Streams and understand the amount of redo generated in the 10g environment to see if your network could handle pushing it to the 11g environment. Streams is very delicate, so we had to change some of our internal processes to eliminate most of the temporary processing (creating temp tables etc) in the schema that are replicated, monitoring batch jobs etc.  

In this solution you could use the 11g database for most of the read only testing. And a couple of times, we stopped Streams and let QA teams write to the database as well.

If you can afford to buy Oracle GoldenGate that is worth considering.

-Upendra

> From: ChrisDavid.Taylor_at_ingrambarge.com
> To: oracle_at_dunbar-it.co.uk; oracle-l_at_freelists.org
> Date: Tue, 6 Mar 2012 11:16:04 -0600
> Subject: RE: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - alternatives?
>
> RMAN conversion *can* do little to big - you have to build the shell database on the target server first. I had researched that part already in blogs and in the Oracle Database Backup and Recovery Advanced Users Guide (I believe it was).
>
> Thanks Norman - much appreciated!
>
> Chris Taylor
>
> "Quality is never an accident; it is always the result of intelligent effort."
> -- John Ruskin (English Writer 1819-1900)
>
> Any views and/or opinions expressed herein are my own and do not necessarily reflect the views of Ingram Industries, its affiliates, its subsidiaries or its employees.
>
>
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Norman Dunbar
> Sent: Tuesday, March 06, 2012 11:11 AM
> To: oracle-l_at_freelists.org
> Subject: Re: RMAN convert 5TB db on Linux (Little Endian) to AIX (Big Endian) - alternatives?
>
> Hi Chris,
>
> On 06/03/12 15:17, Taylor, Chris David wrote:
> > I was asked about converting a 5 TB 10.2 database on RHEL to a 11.2 database on AIX.
> I've just completed a conversion of a 6.5 Tb database on HPuX to Linux using transportable tablespaces. Worked fine for me. However, are your servers the same endienness? Mine were, but I'm not sure you can do TTs across different endians. (Note to self, check the manual!)
>
> > As I was thinking through this, I understand that to do the conversion from Linux to AIX the database would have to be at the same version. So, I'd either have to upgrade prior to moving, or after. Then I was thinking about the RMAN conversion speed to convert from little endian to big endian and I think I would have a problem due to the time required.
> I got a conversion rate, using RMAN on the destination server, of 2 GB every 20 seconds.
>
> if you can't do little->big endian conversions, you may well be resorting to data pump or exp/imp I'm afraid. Good luck with that for the size of your database.
>
>
> Cheers,
> Norm.
>
> --
> Norman Dunbar
> Dunbar IT Consultants Ltd
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Received on Tue Mar 06 2012 - 15:10:36 CST

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