MongoDB interview questions part 8
MongoDB interview questions part 8
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Total Questions: 20
1. Which of the following collections work in a way similar to circular buffers ?
Correct Answer is : Capped
2. Point out the correct statement :
Correct Answer is : Capped collections automatically remove the oldest documents in the collection without requiring scripts or explicit remove operations
3. _________ stores a log of the operations in a replica set.
Correct Answer is : oplog.rs
4. ___________ is also used to pre-allocate space for an ordinary collection.
Correct Answer is : db.createCollection.
5. Point out the wrong statement :
Correct Answer is : Queries need an index to return documents in insertion order
6. If you perform a ________ on a capped collection with no ordering specified, MongoDB guarantees that the ordering of results is the same as the insertion order.
Correct Answer is : find()
7. Which of the following should is used to check whether collection is capped or not ?
Correct Answer is : isCapped()
8. ___________ convert a non-capped collection to a capped collection .
Correct Answer is : convertToCapped
9. _________ command creates the capped collection and imports the data.
Correct Answer is : cloneCollectionAsCapped
10. Which of the following command obtains a global write lock and will block other operations until it has completed ?
Correct Answer is : isCapped
11. MongoDB allows administrators to direct the balancing policy using ______ aware sharding.
Correct Answer is : rack
12. Point out the correct statement:
Correct Answer is : Use sharded clusters if your data set approaches or exceeds the storage capacity of a single MongoDB instance
13. Tags are the primary mechanism to control the behavior of the _______ and the distribution of chunks in a cluster.
Correct Answer is : Balancer
14. How many background process runs behind balanced cluster ?
Correct Answer is : 2
15. Point out the wrong statement :
Correct Answer is : To create splits, MongoDB does migrate any data or affect the shards
16. _________ is a background process that keeps chunks from growing too large.
Correct Answer is : Splitting
17. The shards manage _______ migrations as a background operation between an origin shard and a destination shard.
Correct Answer is : chunk
18. For most deployments, the default value of chunk is _____ megabytes is ideal.
Correct Answer is : 64
19. The ______ instances are the routers for the cluster.
Correct Answer is : mongos
20. A single sharded cluster must have exclusive use of its _______ servers.
Correct Answer is : config
