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MongoDB C100DBA Practice Exam Questions
MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
Total Questions : 132
Update Date : November 18, 2025
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MongoDB C100DBA Sample Question Answers
Question # 1Which of the following statements are true about the $match pipeline operator? Check all that apply.
A. You should use it early as possible in the pipeline
B. It can be used as many time as needed.
C. It has a sintax similar to findQ commands.
Question # 2
Consider the following document: > db.c.find() { "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] } Which of the following queries on the "c" collection will return only the first five elements of the array in the "b" field? E.g., Document you want returned by your query: { "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
A. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )
B. db.c.find( { b : [ 0 , 5 ] > )
C. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
D. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
E. db.c.find( { > , { b : [ 0 , 5 ] > )
Question # 3
What tool do you use if you want to extract a CSV from mongo?
Question # 4
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. Clients read from the nearest member of a replica ser by default
C. Operations on the primary are recorded in a capped collection called the oplog
Question # 5
What tool do you use to see if you have a problem in the consumption of disk I / 0?
Question # 6
What tool would you use if you want to save a gif file in mongo?
Question # 7
Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.
A. Multi-statement transactions
B. Joins
C. Authentication
Question # 8
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
A. Sharding
B. Properly defined user roles
C. Replication
D. Put indexes on all of your documents
E. The proper storage engine
Question # 9
Which of the following is a valid insert statement in mongodb? Select all valid.
A. db.test.push({x:2,y:"apple"})
B. db.test.insert«"x":2, "y":"apple"})
C. db.test.insert({x:2,y:"apple"})
D. db.test.insert({x:2},{y:"apple"})
Question # 10
Which of the following are common uses of the mongo shell? Check all that apply
A. Perform queries against MongoDB collections
B. Perform administrative tasks
C. Use as a JavaScript framework for your production system
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