MongoDB Database Certified Specialist

The MongoDB Database Certified Specialist certification validates foundational to intermediate skills in working with MongoDB as a NoSQL database, covering core areas such as data modeling, document management, indexing, querying, and performance optimization.

1. MongoDB Architecture and Fundamentals

• Understanding MongoDB as a document-oriented NoSQL database
• JSON and BSON document structure
• Understanding collections, documents, and fields
• MongoDB deployment components: mongod, mongos, replica sets, and sharding basics

2. Data Modeling and Schema Design

• Designing schemas optimized for read/write performance and application needs
• Embedding vs referencing documents
• One-to-one, one-to-many, and many-to-many modeling patterns
• Schema validation using validator and JSON Schema rules

3. CRUD Operations and Data Management

• Inserting documents (insertOne, insertMany)
• Reading data using find(), projection, sorting, and filtering
• Updating documents with $set, $inc, $push, $pull, and array filters
• Deleting documents using deleteOne, deleteMany
• Working with ObjectId and _id management

4. Querying and Aggregation Framework

• Using operators ($eq, $gt, $in, $regex, etc.) in queries
• Combining conditions with $and, $or, $not
• Pagination using skip and limit
• Performing complex data transformations with the Aggregation Pipeline
• Stages such as $match, $group, $project, $sort, $lookup, and $unwind

5. Indexing and Performance Optimization

• Creating and managing indexes (createIndex, dropIndex)
• Types of indexes: single field, compound, multikey, text, geospatial, hashed
• Understanding and analyzing index usage with explain()
• Strategies for query performance tuning
• Avoiding collection scans and using covered queries

6. Basic Administration and Tools

• Connecting to MongoDB using mongosh
• Managing databases and collections (createCollection, dropDatabase, dropCollection)
• Using MongoDB Atlas and understanding cloud deployment options
• Importing and exporting data with mongoimport and mongoexport
• Backup basics with mongodump and mongorestore

7. Security and Access Control (Foundations)

• User creation and role-based access control (RBAC)
• Authentication methods (SCRAM, x.509 overview)
• Assigning roles and managing privileges
• Understanding basic security best practices

8. Replication and Scalability (Intro Level)

• Concept of replica sets and high availability
• Role of primary and secondary nodes
• Basic failover behavior
• Intro to sharding and distributed data design