MongoDB C100DBA MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Online Training
MongoDB C100DBA Online Training
The questions for C100DBA were last updated at Jul 05,2025.
- Exam Code: C100DBA
- Exam Name: MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
- Certification Provider: MongoDB
- Latest update: Jul 05,2025
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?
- A . None of the above
- B . 5
- C . 3
- D . 4
Which operations add new documents to a collection?
- A . Create
- B . update
- C . insert
- D . delete
Consider that you have a collection called population which has fields state and city.
Which of the following query will calculate the population grouped by state and city?
- A . db.population.aggregate( [{ $group: { _id: { state: "$state", city; "$city" },pop: { $sum: 1 > > >] )
- B . db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $pop: 1 } } }] )
- C . db.population.aggregate( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )
- D . db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
Which of the following is true about sharding?
- A . Creating a sharded key automatically creates an index on the collection using that key
- B . We cannot change a shard key directly/automatically once it is set up
- C . A sharded environment does not support sorting functionality since the documents lie on various mongod instances
- D . Sharding is enabled at the database level
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
- A . netLatency
- B . secondaryPreferred
- C . nearest
- D . primaryPreferred
Which node in a replica set does accept write operation?
- A . arbiter
- B . hidden
- C . primary
- D . secondary
Using an arbiter allows one to easily ensure an odd number of voters in replica sets.
Why is this important?
- A . To help in disaster recovery
- B . To protect agains network partitions
- C . To enable certain read preference settings
- D . To add greather redundancy
- E . For more efficient backup operations
Which 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.
Which 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.
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