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C100DEV: MongoDB Certified Developer Exam
We recommend this certification for software engineers who have a solid understanding of MongoDB fundamentals and some professional experience developing applications with MongoDB.
Exams are web-proctored (online)
Exams are open for one week on a monthly basis
Duration: 90 minutes / 60 questions
Question Type: Multiple choice / Check All that Apply
There is no penalty for incorrect answers.
Exam Cost – $150 USD
MongoDB C100DEV exam questions are available in PDF and Software versions. C100DEV exam questions in PDF version is the simplest way for you to read and study all the questions and answers. It can be printed out and shared with your friends. C100DEV exam questions in Software version is a simulation of real MongoDB C100DEV exam, and you can feel the real exam environment. Share MongoDB Certified Developer Associate C100DEV Demo Questions
1. Which of the following must be true for a query to be a covered query?
A. All fields used in the selection filter of the query must be in the index that the query uses
B. All fields returned in the results must be in the index that the query uses
C. All fields returned in the results must be fields in the selection filter of the query
Answer: A, B
2. Select true statements about index performance.
A. For the fastest processing, we should make sure our indexes fit entirely in RAM.
B. Indexes cannot decrease insert throughput.
C. Follow the SRE rule: Sort, Range, Equality.
D. You should use covered queries when possible.
E. Indexes don't have to be completely stored in RAM, but permanent disk access to retrieve index information will have a performance impact.
Answer: A, D, E
3. Which writes are atomic in MongoDB 4.0?
A. An update to multiple documents in a sharded cluster
B. An update to multiple documents in a replica set using transactions
C. An update to a single document in a shared cluster
D. An update to mutiple documents in a shared cluster
Answer: A, B, C
4. In MongoDB, the WiredTiger storage engine provides concurrency at what level?
A. Server-level concurrency
B. Database level concurrency
C. Collection level concurrency
D. Document level concurrency
E. Field level concurrency
Answer: D
5. Which of the following commands can you use to exports data in BSON format from a MongoDB cluster?
A. mongostore
B. mongodump
C. mongoimport
D. mongoexport
Answer: B
6. Which of the following is true of covered queries? Check all that apply.
A. MongoDB can satisfy covered queries using only index keys.
B. MongoDB can satisfy covered queries efficiently without the use of an index.
C. Covered queries ordinarily have slower response times than queries that are not covered.
Answer: A
