MongoDB Tutorial

1. MongoDB Introduction

The document model, when it fits better than relational, and connecting via mongosh.

2. CRUD Operations

insertOne/insertMany, find with query operators, updateOne/updateMany, and deleteOne.

3. Schema Design and Modeling

Embedding vs referencing, the core MongoDB modeling decision, and schema validation rules.

4. Aggregation Pipeline

The aggregation pipeline: $match, $group, $project, $sort, and $lookup for joins.

5. Indexes and Performance

Creating indexes, compound indexes, explain(), and common MongoDB anti-patterns.

6. Multi-Document Transactions

Multi-document ACID transactions, a complete example, and when you need them versus single-document atomicity.

7. Sharding in MongoDB

Shard keys, choosing a good one, and how queries route across a sharded cluster.

8. MongoDB Interview Questions

Real MongoDB interview questions and answers covering modeling, aggregation, and indexing.