I am using MongoDB 3.0.10 with 10 databases in it,
also has implemented 3 member replica Set for it,
the question is it possible to replicate only selected databases from Primary to Secondary? If yes, then How?
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Sign up to join this communityYou are basically looking for filtered replication, and as of writing this answer (August 2016) it is not available as a feature in MongoDB. The relevant feature request is SERVER-1559 for tracking/voting purposes (it is currently unscheduled).
In terms of options, you can get close to what you describe with the mongo-connector but that is not an officially supported tool.