MongoDB — Top 50 MongoDB Technical Interview Q&A
Comprehensive interview prep guide covering top 50 beginner, intermediate, and advanced MongoDB technical questions.
1Top Technical Q&A Highlights
❓ Q1: What is the difference between BSON and JSON?
Answer: JSON is a text-based format supporting 6 basic types. BSON is a binary encoding of JSON supporting 20+ rich types (Date, ObjectId, Decimal128) and enables fast traversal in MongoDB memory.
❓ Q2: What is an index scan (IXSCAN) vs collection scan (COLLSCAN)?
Answer: A COLLSCAN scans every document in a collection. An IXSCAN uses a B-tree index to locate specific matching keys instantly, avoiding full table scans.