Re: Oracle DR Solution
Date: Wed, 31 Aug 2011 21:30:55 -0700
Message-Id: <8CFC357A-9F29-406E-A3EB-606A3545D582_at_yahoo.com>
Hi Hemant,
Good morning! What you state may be relevant to your environment but does not necessarily have to be the case for every environment. Here is a real-life example:
Company with 3 datacenters - A (PRIMARY), B (HA) and C (DR). A and B are 60km apart in the same state. C is totally different state and a different timezone and is 1,572 miles away. B & C are reasonably in sync with the contents of A and this is done using Oracle Golden Gate. A, B and C all run Oracle, the same version of Oracle and are on the same platform.
A has a serious failure. B is now the PRIMARY. Reporting needs to be offloaded to DR, to maintain SLAs on B. The reporting component of the application utilizes and manipulates Global Temporary Tables, thus requiring the database to be in READ/WRITE mode. Cannot use DG or Active DG in this case, because one cannot manipulate a GTT in a READ ONLY WITH APPLY mode database. Replication using Oracle Golden Gate is the way to go, thus making it a DR solution.
Best regards,
Gaja
Gaja Krishna Vaidyanatha,
CEO & Founder, DBPerfMan LLC
http://www.dbperfman.com
Phone - 001-650-743-6060
Co-author:Oracle Insights:Tales of the Oak Table - http://www.apress.com/book/bookDisplay.html?bID14
Co-author:Oracle Performance Tuning 101 - http://www.amazon.com/gp/reader/0072131454/ref=sib_dp_pt/102-6130796-4625766
On Aug 31, 2011, at 7:59 PM, Chitale, Hemant Krishnarao wrote:
>
> IMHO, GoldenGate would be positioned as a DR solution only where
> a. The Primary and Standby are running different Oracle versions or on different platforms
> b. Either of the two is non Oracle
> Essentially : For Heterogeneous implementation (different versions and different platforms count as Heterogeneous)
>
>
> Where the Primary and Remote site are both
> a. Running Oracle
> b. Running the same Version of Oracle
> c. Running on the same Platform
> DataGuard is the DR solution.
>
> Hemant K Chitale
>
>
> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Gaja Krishna Vaidyanatha
> Sent: Thursday, September 01, 2011 5:34 AM
> To: Oracle-L List
> Subject: Re: Oracle DR Solution
>
> Greetings Hemant,
>
> Not sure I fully understand what you mean by "GoldenGate is NOT a DR solution". Any DR site needs to be populated with some data replication method. And DataGuard and GoldenGate BOTH do just that, albeit in different ways.
>
> <snip to avoid over-quoting>
>
> Gaja
>
> Gaja Krishna Vaidyanatha,
>
>
>
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-- http://www.freelists.org/webpage/oracle-lReceived on Wed Aug 31 2011 - 23:30:55 CDT