Explanation:To ensure selectivity, write queries that limit the number of possible documents with the indexed field. Write queries that are appropriately selective relative to your indexed data. 3. _________ defines a circle for a geospatial query that uses spherical geometry.
A. $center
B. $centre
C. $radii
D. $centersphere
Answer:A
Explanation:To ensure selectivity, write queries that limit the number of possible documents with the indexed field. Write queries that are appropriately selective relative to your indexed data. 3. _________ defines a circle for a geospatial query that uses spherical geometry.
A. $center B. $centre C. $radii D. $centersphere
Explanation:You can use the $centerSphere operator on both GeoJSON objects and legacy coordinate pairs. 4. When used with the $box operator, _________ returns documents based on grid coordinates and does not query for GeoJSON shapes.