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How many types of sharding exist in MongoDB?

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How many types of sharding exist in MongoDB?

(a) 1

(b) 2

(c) 3

(d) All of the mentioned

This question was posed to me in an international level competition.

This interesting question is from Sharding Introduction in portion Sharding Concepts, Mechanics and Sharded Cluster of MongoDB

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Right answer is (b) 2

The explanation is: MongoDB have two basic approaches: vertical scaling and sharding.

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