MongoDB MongoDB Certified DBA Associate C100DBA Questions & Answers

• Question 1:

  A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

  A. Column and Row

  B. Table and Row

  C. Database and Table

  D. Table and Column

  Correct Answer: B

• Question 2:

  We can insert multiple documents in bulk using which of the following operations:

  A. initializeUnorderedBulk

  B. initializeUnorderedBulkOp

  C. initializeBulk

  D. initializeBulkOp

  Correct Answer: B

• Question 3:

  Which of the following does MongoDB use to provide High Availability and fault tolerance?

  A. Sharding

  B. Indexing

  C. Replication

  D. Write Concern

  Correct Answer: C

• Question 4:

  What tool do you use if you want to extract a CSV from mongo?

  A. mongoexport

  Correct Answer: A

• Question 5:

  Which type of indexes does MongoDB support?

  A. All of the above

  B. Compound Indexes

  C. Multikey Indexes

  D. Geospatial Indexes

  Correct Answer: A

• Question 6:

  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. oplog.rs

  B. ..oplog.rs

  C. .oplog.rs

  D. local.oplog.rs

  Correct Answer: D

• Question 7:

  Which of the following is correct about MongoDB?

  A. MongoDB supports geospatial indexes

  B. MongoDB supports some of the SQL functions

  C. MongoDB uses JSON format to represent documents

  D. MongoDB supports collection joins

  Correct Answer: A

• Question 8:

  In a sharded cluster, from which node does one stop the balancer process before initiating backup?

  A. Any node

  B. replicaset primary node

  C. config server node

  D. mongos node

  Correct Answer: D

• Question 9:

  Update If Correct is an approach for which of the following concepts in MongoDB:

  A. Concurrency Control

  B. Atomicity

  C. Performance Management

  D. Transaction Management

  Correct Answer: A

• Question 10:

  You have the following index on the toys collection:

  {

  "manufacturer" : 1,

  "name" : 1,

  "date" : -1

  }

  Which of the following is able to use the index for the query? Check all that apply.

  A. db.toys.find( { name : "Big Rig Truck", date : "2013-02-01", manufacturer : "Tanko"

  B. db.toys.find( { manufacturer : "Matteo", name : "Barbara", date : "2014-07-02" } )

  C. db.toys.find( { date : "2015-03-01", manufacturer : "Loggo", name : "Brick Set" } )

  Correct Answer: ABC