C100DEV Exam Dumps | Suppose we have a products collection with the following fields and values:

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MongoDB.C100DEV.v2023-03-11.q87
Question 72

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Question 72/87

Suppose we have a products collection with the following fields and values: _id (automatically created ObjectId) product_code (unique values for each product) color (as String values) size (this field is missing for some products) origin_country Which of these fields would be the best shard key?

A. size

B. product_code

C. origin_country

D. _id

E. color

Correct Answer: B

With color, size, and origin_country we run the risk of low cardinality. The _id wouldn't make a good shard key because it isn't something meaningful we could query the database. https://docs.mongodb.com/manual/core/sharding-shard-key/

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