An index cannot cover a query on a _______ collection when run against a mongos if the index does not contain the shard key.
A. vertical
B. sharded
C. horizontal
D. None of the mentioned
Answer:A
An index cannot cover a query on a _______ collection when run against a mongos if the index does not contain the shard key.
A. vertical B. sharded C. horizontal D. None of the mentioned