C100DBA Dumps C100DBA Braindumps C100DBA Real Questions C100DBA Practice Test C100DBA Actual Questions

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Question: 38

Which are the ONLY ways to project portions of an array? A . $slice

B . $

C . All of the above D . $ elemMatch

Answer: C

Question: 39

Which operations add new documents to a collection? A . Create

B . update C . insert D . delete

Answer: A,C

Question: 40

The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

A . $project

B . $aggregate C . $match

D . $group

Answer: A

Question: 41

Which of the following is true about sharding?

A . Creating a sharded key automatically creates an index on the collection using that key B . We cannot change a shard key directly/automatically once it is set up

C . A sharded environment does not support sorting functionality since the documents lie on various mongod instances D . Sharding is enabled at the database level

Answer: B Question: 42 MongoDB is

A . None of the above

B . Object-oriented DBMS C . Relational DBMS

D . Document-oriented DBMS

Answer: D

Question: 43

Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?

A . To help in disaster recovery

B . To protect agains network partitions

C . To enable certain read preference settings D . To add greather redundancy

E . For more efficient backup operations

Answer: B