Free Access MongoDB.C100DBA.v2022-02-21.q41 Practice Test (Page 9)

Question 36

Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

A.Both "db.posts.find({author:"Tom"},{tags:{$slice:2}})" and
"db.posts.find({author:"Tom"}).limit($slice: {tags:2})" are valid. $slice works both with projection and limit.

B.db.posts.find({author:"Tom">,{tags:{$slice:2})

C.db.posts.find({author:"Tom"}.limit($slice:{tags:2>)

D.db.posts.find({author:"Tom"}.limit({tags:2})

Question 37

MongoDB is

A.Relational DBMS

B.Document-oriented DBMS

C.Object-oriented DBMS

D.None of the above

Question 38

Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?

A.reads will be stale until the primary comes back up

B.the primary may roll back the operations once it recovers

C.missing operations will need to be manually re-performed

D.the most current secondary will roll back the operations following the election

E.the secondary with the most current oplog will be elected primary

Question 39

What is the output of the following program?

A.100 s

B.100 ms

C.1s

D.60 s

Question 40

Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

A.Members of a replica set may replicate data from any other data-bearing member of the set by default

B.Operations on the primary are recorded in a capped collection called the oplog

C.Clients read from the nearest member of a replica ser by default

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Question 36

Question 37

Question 38

Question 39

Question 40

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