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MongoDB Associate Database Administrator C100DBA Dumps in PDF

Free MongoDB C100DBA Real Questions (page: 22)

Page 5 of 28 C100DBA PDF — 161 Questions

QUESTION: 21

What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?

None of the above
5
3
4

Answer(s): D

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QUESTION: 22

Which operations add new documents to a collection?

Create
update
insert
delete

Answer(s): A,C

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QUESTION: 23

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

Answer(s): C

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QUESTION: 24

Which of the following is true about sharding?

Creating a sharded key automatically creates an index on the collection using that key
We cannot change a shard key directly/automatically once it is set up
A sharded environment does not support sorting functionality since the documents lie on various mongod instances
Sharding is enabled at the database level

Answer(s): B

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QUESTION: 25

Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

netLatency
secondaryPreferred
nearest
primaryPreferred

Answer(s): C

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