Question

Point out the correct statement.

(a) Applications can use $center without having a geospatial index

(b) Before 3.0, a geospatial index must exist on a field holding coordinates before using any of the geospatial query operators

(c) To use $centerSphere, specify an array that contains grid coordinates of the circle’s center point

(d) None of the mentioned

I got this question during an interview.

Origin of the question is Indexing Methods topic in portion Index/Indexing Concepts of MongoDB

Answer 1

Right option is (a) Applications can use $center without having a geospatial index

The explanation is: However, geospatial indexes support much faster queries than the unindexed equivalents.