Best way to synchronize DR standby database

Hi,
My setup consists of 3 database installations in three data centers on aix 6.1 and oracle 11g release 2 Enterprise editions.
The first data center will host the primary database, while the second data center will act as a hot standby site, hosting the physical standby database in a data guard configuration. This second data center is just a few hundred meters from the primary site and is connected with dark fiber.
The 3rd site is a DR site located about 300KM from the first two centers, and with a WAN link of speeds around 2Mbps. This third site should act as a disaster recovery site in case there's a natural calamity that destroys the first two sites.
We purchased full license for the first two sites for oracle. However, for the 3rd site, we're only allowed to open the database for up to 10 days in a year. My question is how can we always bring this 3rd database into sync with the first two. Can we use full backups to recover the database periodically, like every month? Or is there another option of using archivelogs, considering that the database can only be open up to a maximum of 10 days in a year?
Both the primary and the DR sites have Tivoli server installed complete with the tape libraries and we're suppose to take backups even on the DR site.
Regards,
dula

I think your potential solutions depend in part on the meaning of 'open' and what kind of database set up you have at the third site. If the third site is a Standby Datbase and open means in use for any purpose other than recovery mode then you should be able to start it and apply the logs so the the database is ready should the need arise.
If open means the database is started and active then all you can really do is install Oracle at the third site and leave it off. In this case what I would do is use the rman duplicate command to build the initial database, start it, test it, and shut it down. Then you transfer your primary database rman backup to the site every day along with copies of the archived redo logs. In the event of a primary/secondary site failure you just need to run an rman restore of the newest backup set then recovery using the copied archive redo logs and you are up and running.
There will be the time delay equal to the time to run restore and recovery but you can set up the remote diaster site, test it, and be pretty sure it will work without using up your 10 day limit.
An alternate license arrangement might be to run RAC at the two local data centers and have a Stand by database at the remote site.
HTH -- Mark D Powell --

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