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MongoDB NoSQL Database Tutorial• 6 min read
Replica Sets & Horizontal Sharding
Achieve 99.999% high availability with 3-node Replica Sets, automatic election failover, and horizontal cluster sharding.
Primary-Secondary Replication
A standard MongoDB replica set contains 1 Primary node (accepts writes) and 2 Secondary nodes (replicate via the oplog). If the primary fails, secondaries hold an automatic election within seconds.
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Test Yourself With Exercise
In a MongoDB replica set, which node is responsible for receiving write operations from the application by default?