Re: high availability and DR architecture

Posted by ErmanArslansOracleBlog on Jun 30, 2017; 8:53am
URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/high-availability-and-DR-architecture-tp2874p2876.html

Dataguard is the best for Oracle DR.
You can also use storage snapshot/snapmirror -- replication , as an alternative to dataguard, but dataguard is better.  (you have to know what you are doing, and you need to put the database in hot backup mode, before your replication, before your storage snapshot(or any similar thing) is taken)

RAC Extended Clusters can be thought like a disaster solution in a manner, as well. However, it does not protect from human errors or corruptions because the nodes are using the shared storage.

That document is specifically written for Oracle RAC one node.
However, you can built an Extended Cluster for multinode Oracle RAC (not only for Oracle RAC one node), as well.
You can think Oracle RAC one node as a active-passive cluster solution.

Read my blog posts, I have written lots of Dataguard, Storage replication and Extended Cluster related whitepapers.