Exam style questions across every C100DBA domain
Last Update 2 days ago
Total Questions : 172
Start with our free C100DBA practice questions, carefully crafted to mirror the domains, phrasing, and difficulty of the real MongoDB Certified DBA Associate exam. Each C100DBA exam question comes with a detailed rationale that explains not just which answer is correct but why the others fall short. That's how concepts stick. Use the free set to benchmark yourself: identify your MongoDB weak domains, see where you're losing marks, and build a focused study plan in minutes.
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called " sample " . Check all that apply.
db.sample.find( { " $or " : [ { " a " : { " $in " : [ 3, 10] > }, { " b " : { " $lt " : 2 > > ] > )
Consider the following posts document:
Which of the following queries will return the documents but with only the first two tags in the tags array?
A MongoDB administrator is managing a database for a hospital system.
The patients collection contains:
- Carlos Martinez, diagnosis Hypertension, room 203
- Maria Lopez, diagnosis Hypertension, room 207
- Juan Perez, diagnosis Arrhythmia, room 207
The administrator runs:
db.patients.updateMany(
{ diagnosis: " Hypertension " },
{ $set: { room: 207 } }
)
What output should the administrator expect?
