MongoDB Questions and Answers – Index Management

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

1. To modify an existing index, you cannot just re-issue the _________ method with the updated specification of the index.
a) dropIndex()
b) modIndex()
c) createIndex()
d) none of the mentioned
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2. Point out the wrong statement.
a) To modify an existing index, you need to drop and recreate the index
b) Your client library may have a different or additional interface for this operation
c) To see the status of an indexing process, you can use the db.statusOp() method in the mongo shell
d) None of the mentioned
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3. 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.
a) db.collection.Index()
b) db.collection.reIndex()
c) db.collection.rebuildIndex()
d) none of the mentioned
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4. To terminate an ongoing index build, use the __________ method in the mongo shell.
a) db.currentOp()
b) db.killOp()
c) db.removeOp()
d) all of the mentioned
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5. Point out the correct statement.
a) After 4.0, you cannot terminate both background index builds and foreground index builds
b) Before MongoDB 2.1, you could only terminate background index builds
c) After 2.4, you can terminate both background index builds and foreground index builds
d) None of the mentioned
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6. In the mongo shell, you can use the ______ method to return a list of the indexes on a collection.
a) getallIndexes()
b) getretIndexes()
c) getIndexes()
d) none of the mentioned
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7. __________ views partial execution statistics collected during plan selection.
a) curs.explain()
b) cursor.explain()
c) cursr.explain()
d) all of the mentioned
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8. The __________ operator constrains the results of a geospatial $near or $nearSphere query to the specified distance.
a) $center
b) $maxDistance
c) $minDistance
d) all of the mentioned
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9. To force MongoDB to use a particular index for a db.collection.________ operation, specify the index with the hint() method.
a) query()
b) find()
c) index()
d) all of the mentioned
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10. Specify the ______ operator to the hint() method to prevent MongoDB from using any index.
a) $unique
b) $natural
c) $spatial
d) all of the mentioned
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