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QUESTION: 41

You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?

Switchover needs to be done manually
Failover happens automatically
Switchover happens automatically
Failover needs to be done manually

Answer(s): B

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QUESTION: 42

You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

Answer(s): C

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QUESTION: 43

In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

Even
Odd
2
Depends on the application architecture

Answer(s): B

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QUESTION: 44

Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )
db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum:
"$pop" } } }] )
db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: 1 > > >] )

Answer(s): C

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