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Question

Point out the correct statement.

a.

The unique constraint on indexes ensures that only one document can have a value for a field in a collection

b.

MongoDB support creating new unique indexes in sharded collections

c.

If you use a compound shard key, you cannot enforce uniqueness on the combination of component keys in the shard key

d.

All of the mentioned

Posted under MongoDB

Answer: (a).The unique constraint on indexes ensures that only one document can have a value for a field in a collection

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