Free Access MongoDB.C100DBA.v2022-02-21.q41 Practice Test (Page 4)

Question 11

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

A.local.oplog.rs

B.<replicasetid>.oplog.rs

C.<database>..oplog.rs

D.oplog.rs

Question 12

Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

A.db.posts.finOne{},{post_text:l})

B.db.posts.finOne({},{_id:0, post_text:1})

C.db.posts.findOne({post_text: 1})

D.db.posts.find({},{_id:Of post_text:1})

Question 13

You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

A.sh.stopBalancer()

B.db.stopBalancer()

C.sh.stopserverQ

D.db.stopserver()

Question 14

The difference between $push and $addToSet is:

A.$addToSet needs the fields to be already present while $push will work even if the field is not present

B.There is no major difference between them. $addToSet is a deprecated version of $push.

C.$addToSet adds the item to the field only if the new item is of the same datatype

D.$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

Question 15

By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

A.200, more

B.No limit, none

C.20, it

D.50, it

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