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Hi Goran, As William pointed out the EMC is not aware what happens with the database, it's replicating blocks from one site to other. Also choosing technology depend on the purpose, if your purpose is to have no or zero downtime and don't want to loose a single transaction you'll probably go with Dataguard and synchronous replication. What's more if you start Active Dataguard corrupted blocks on the primary will be corrected by the standby database once they reached there. Also running Active Dataguard gives you the ability to use is for a reporting purposes and redirect DMLs to the primary database. On the other hand EMC SRDF could be used to replicate not only Oracle databases, but all other services, it's storage-to-storage replication. If you go with SRDF you could create a snapshot of the replicated disks and start the database for test purposes or for any other purposes. I'll be doing the same exercise next week just for tests, but with HP Continuous Access. We are running also Dataguard which is the primary disaster recovery solution. With Dataguard the process of switch or failover to the standby database is more clear and it's initiated by the database administrators. Either case share your experience once you finish building your disaster recovery scenario. Regards, Sve On 12/02/2010 02:58 PM, goran bogdanovic wrote: Hi all, -- //www.freelists.org/webpage/oracle-l |