The MongoDB® replica set is a group of nodes with one set as the primary node, and all other nodes set as secondary nodes. Only the primary node accepts “write” operations, while other nodes can only serve “read” operations according to the read preferences defined. In this blog post, well focus on some MongoDB replica set scenarios, and [&]

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https://www.percona.com/blog/2018/10/10/mongodb-replica-set-scenarios-and-internals/