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The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:
In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?
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