MongoDB Questions and Answers – Indexing Methods

This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Indexing Methods”.

1. __________ query calculates distances using flat (planar) geometry.
a) $center
b) $centre
c) $radii
d) Sort
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2. Point out the wrong statement.
a) The query scans the index and not the collection
b) If overall selectivity is high, and if MongoDB must read a number of documents to return results, then some queries may perform faster without indexes
c) A better strategy, depending on your queries, would be to create a compound index that includes the high-selectivity field and another field
d) None of the mentioned
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3. _________ defines a circle for a geospatial query that uses spherical geometry.
a) $center
b) $centre
c) $radii
d) $centersphere
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4. When used with the $box operator, _________ returns documents based on grid coordinates and does not query for GeoJSON shapes.
a) $geoNear
b) $geoWithin
c) $geoRear
d) All of the mentioned
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5. 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
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6. Applications can use _________ without having a geospatial index.
a) $center
b) $centre
c) $radii
d) $centersphere
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7. _________ specifies a polygon for a geospatial $geoWithin query on legacy coordinate pairs.
a) $rect
b) $polygon
c) $poly
d) All of the mentioned
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8. Only the ______ geospatial index supports the $polygon operator.
a) 1dsphere
b) 2d
c) 3d
d) None of the mentioned
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9. ________ returns a document only once for a geospatial query even if the document matches the query multiple times.
a) $uniqueDocs
b) $unique
c) $Docs
d) All of the mentioned
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Sanfoundry Global Education & Learning Series – MongoDB.

Here’s the list of Best Books in MongoDB.