MongoDB interview questions part 16
MongoDB interview questions part 16
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Total Questions: 20
1. ___________ is a specification for storing and retrieving files that exceed the BSON-document size limit of 16MB.
Correct Answer is : GridFS
2. Point out the correct statement :
Correct Answer is : GridFS uses two collections to store files
3. By default GridFS limits chunk size to ______ k.
Correct Answer is : 255
4. When you query a GridFS store for a file, the _______ will reassemble the chunks as needed.
Correct Answer is : client
5. Point out the wrong statement :
Correct Answer is : Chunks in the context of GridFS is related to the use of the term chunks in the context of sharding
6. MongoDB represents queries as ___________ objects.
Correct Answer is : BSON
7. Each document in the __________ collection represents a distinct chunk of a file as represented in the GridFS store.
Correct Answer is : chunks
8. GridFS uses a _________ index on the chunks collection for the files_id and n fields.
Correct Answer is : unique
9. The ___ field contains the sequence number of the chunk.
Correct Answer is : n
10. The GridFS index allows efficient retrieval of __________ using the files_id and n values
Correct Answer is : chunks
11. To modify an existing index, you cannot just re-issue the _________ method with the updated specification of the index.
Correct Answer is : createIndex()
12. Point out the wrong statement :
Correct Answer is : To see the status of an indexing process, you can use the db.statusOp() method in the mongo shell
13. If you need to rebuild indexes for a collection you can use the _________ method to rebuild all indexes on a collection in a single operation.
Correct Answer is : db.collection.Index()
14. To terminate an ongoing index build, use the __________ method in the mongo shell.
Correct Answer is : db.killOp()
15. Point out the correct statement :
Correct Answer is : After 2.4, you can terminate both background index builds and foreground index builds
16. In the mongo shell, you can use the ______ method to return a list of the indexes on a collection.
Correct Answer is : getIndexes()
17. __________ views partial execution statistics collected during plan selection
Correct Answer is : cursor.explain()
18. The __________ operator constrains the results of a geospatial $near or $nearSphere query to the specified distance.
Correct Answer is : $maxDistance
19. To force MongoDB to use a particular index for a db.collection.________ operation, specify the index with the hint() method.
Correct Answer is : find()
20. Specify the ______ operator to the hint() method to prevent MongoDB from using any index
Correct Answer is : $natural
