_________ operations that use an index often have better performance than those that do not use an index.
A. Select
B. Update
C. Delete
D. Sort
Answer:A
_________ operations that use an index often have better performance than those that do not use an index.
A. Select B. Update C. Delete D. Sort
Explanation:In MongoDB, sort operations can obtain the sort order by retrieving documents based on the ordering in an index. 2. Point out the wrong statement :