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To support replication, the primary records all changes to its data sets in its _______(a) oplog(b) adlog(c) log(d) none of the mentionedI have been asked this question in an interview for internship.My question is based upon Replication in MongoDB topic in chapter Replication Concepts, Processes and Replication Set of MongoDB

Answer» RIGHT CHOICE is (a) oplog

Explanation: If the primary is unavailable, the replica set will ELECT a secondary to be primary.


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