MongoDB interview questions part 19
MongoDB interview questions part 19
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Total Questions: 20
1. MongoDB indexes use a _______ data structure.
Correct Answer is : Map
2. Point out the correct statement :
Correct Answer is : Indexes support the efficient execution of queries in MongoDB
3. MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.
Correct Answer is : Single
4. The ______ index is unique and prevents clients from inserting two documents with the same value for the _id field.
Correct Answer is : _id
5. Point out the wrong statement :
Correct Answer is : Fundamentally, indexes in MongoDB is different to indexes in other database systems
6. MongoDB also supports user-defined indexes on multiple fields called :
Correct Answer is : compound
7. MongoDB uses ______ indexes to index the content stored in arrays.
Correct Answer is : multikey
8. ___________ indexes use spherical geometry to return results.
Correct Answer is : 2sphere
9. MongoDB provides a ________ index type that supports searching for string content in a collection.
Correct Answer is : text
10. _____ indexes uses planar geometry when returning results.
Correct Answer is : 2d
11. __________ query calculates distances using flat (planar) geometry.
Correct Answer is : $center
12. Point out the wrong statement :
Correct Answer is : 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
13. _________ defines a circle for a geospatial query that uses spherical geometry.
Correct Answer is : $centersphere
14. When used with the $box operator, _________ returns documents based on grid coordinates and does not query for GeoJSON shapes.
Correct Answer is : $geoWithin
15. Point out the correct statement :
Correct Answer is : Applications can use $center without having a geospatial index
16. Applications can use _________ without having a geospatial index.
Correct Answer is : $centersphere
17. __________ method provides a wrapper around the totalIndexSize output of the collStats (i.e. db.collection.stats()) operation.
Correct Answer is : db.collection.totalIndexSize()
18. _________ specifies a polygon for a geospatial $geoWithin query on legacy coordinate pairs.
Correct Answer is : $polygon
19. Only the ______ geospatial index supports the $polygon operator
Correct Answer is : 2d
20. ________ returns a document only once for a geospatial query even if the document matches the query multiple times.
Correct Answer is : $uniqueDocs
