100 MongoDB Interview Questions & Answers

Description

Senior-engineer-level explanations for the 100 questions that actually come up in MongoDB interviews.

This isn’t a quiz — it’s a deep-dive reference. Every question is answered with detailed, in-depth explanations covering not just what but why — the reasoning experienced engineers use when discussing MongoDB in real interviews and real production systems.

What’s covered:

✅ Basics — documents, collections, ObjectId internals, replica sets, sharding
✅ CRUD Operations — inserts, updates, upserts, atomic $inc, pagination tradeoffs
✅ Query Operators — $in, $regex, $elemMatch, $exists with edge-case gotchas
✅ Aggregation Pipeline — $match, $group, $lookup, $facet, $replaceRoot & pipeline ordering
✅ Indexes — compound indexes, ESR rule, sparse/unique/TTL indexes, reading explain()
✅ Mongoose — schemas, virtuals, middleware, populate vs $lookup, validation handling
✅ Data Modeling — embedding vs referencing, bucket pattern, outlier pattern, GridFS
✅ Performance & Concepts — transactions, write concern, oplog, change streams, capped collections

100 questions. In-depth answers. No surface-level definitions.

Perfect for developers prepping for mid-to-senior backend interviews, or anyone who wants to actually understand MongoDB instead of memorizing keywords.

📄 Format: PDF (25 pages)
💰 Price: ₹99