C100DBA CRUD Operations Practice Question
Which method is the most efficient way to perform a bulk update of multiple documents in a single request?
⚠ Common exam trap
Candidates often suggest using a loop with individual updateOne() calls, failing to realize that this results in excessive network round-trips that significantly degrade performance compared to bulk operations.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
db.collection.bulkWrite()
The bulkWrite method provides a way to perform multiple write operations (insert, update, delete) in a single request to the server. This reduces network round-trip latency significantly compared to executing individual update operations in a loop. It is the best practice for high-performance data processing tasks where many small updates need to be applied to the database, ensuring optimal throughput and lower overhead.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
db.collection.updateMany() inside a for loop
Why it's wrong here
Executing multiple update commands in a loop creates significant network overhead because each call is a separate network round-trip. This approach is highly inefficient for large batches and can lead to performance bottlenecks, especially when the application and the database server are in different network segments.
- ✓
db.collection.bulkWrite()
Why this is correct
The bulkWrite method is specifically designed for batching multiple write operations into a single network request. It provides better performance and reduces the overhead associated with individual commands. This is the recommended approach for any application requiring high-volume data modifications or massive import operations.
- ✗
db.collection.update()
Why it's wrong here
The update method is a legacy command that only handles a single document update. It is not designed for bulk operations. Using it to process many documents will result in poor performance and does not utilize the optimized batching capabilities provided by the modern MongoDB driver API.
- ✗
db.collection.saveMany()
Why it's wrong here
There is no method named saveMany in the MongoDB API. Attempting to call this will result in a runtime error. Bulk operations must be performed using the bulkWrite method, which supports various types of write operations, ensuring flexibility while maintaining high throughput for all your batch needs.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official MongoDB exam blueprint
This C100DBA practice question is part of Courseiva's free MongoDB certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the C100DBA exam.