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Question # 1
What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?
A. secondaryPreferred
B. Secondary
C. nearest
D. primary
E. primaryPreferred
Question # 2
Below is a sample document in a given collection test. { a : 5, b : 3, c: 2, d : 1 > Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.
A. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
B. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
C. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
D. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
Question # 3
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
A. update users collection and restart mongodb
B. All of the above
C. update users collection and restart mongodb with -auth option
D. update users collection and run db.enableAuthenticationQ
Question # 4
You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?
A. Switchover needs to be done manually
B. Failover happens automatically
C. Switchover happens automatically
D. Failover needs to be done manually
Question # 5
Which of the following command is used to get all the indexes on a collection?
A. db.collection.showIndexes()
B. db.collection.findlndexes()
C. db.showIndexes()
D. db.collection.getlndexesQ
Question # 6
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Question # 7
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?
A. upsert command instead of update command
B. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
C. {update: true, insert: true} as the third parameter of update command
D. Specify {upsert : true } as the third parameter of update command
Question # 8
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
Question # 9
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({},{_id:0, post_text:1})
B. db.posts.findOne({post_text: 1})
C. db.posts.find({},{_id:Of post_text:1})
D. db.posts.finOne«},{post_text:l})
Question # 10
Which of the following is supported by MongoDB?
A. Transaction Management
B. ACID Transactions
C. Journaling
D. Relationships between Collections (Primary Key Foreign Key)
Question # 11
Which of the following does MongoDB use to provide High Availability and fault tolerance?
A. Sharding
B. Indexing
C. Replication
D. Write Concern
Question # 12
Which of the following node is used during election in a replication cluster?
A. primary
B. arbiter
C. hidden
D. secondary
Question # 13
Which of the following index would be optimum for the query? Select all valid. db.test.find( { a : 5, c : 2 })
A. db.test.ensurelndex( { c:l, a: 1})
B. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})
C. CH db.test.ensurelndex( { a :1, c:l})
D. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
Question # 14
Mongodb does provide high availability via which option?
A. Replication
B. Indexing
C. Sharding
D. Journaling
Question # 15
The MongoDB explain() method does not support which of the following verbosity mode:
A. executionStats
B. queryPlanner
C. customExecutionStats
D. allPlansExecution
