MongoDB

1. Documents and BSON

   BSON types, document structure, _id and the document model.

2. CRUD Operations

   Insert, query, update and delete, query operators, projections and bulk writes.

3. Data Modeling

   Embedding versus referencing, schema design patterns, one-to-many relationships and schema validation.

4. Indexes

   Single-field, compound, multikey, text and TTL indexes, index selection and index properties.

5. Query Plans and Explain

   explain output, query planner, covered queries and index usage analysis.

6. Aggregation Pipeline

   Pipeline stages like $match, $group, $lookup and $unwind, and pipeline optimization.

7. Transactions

   Multi-document ACID transactions, sessions, snapshot isolation and transaction limits.

8. Read and Write Concerns

   Write acknowledgement, majority writes, read concern levels and read preference.

9. Replication

   Replica sets, elections, oplog, failover and replication lag.

10. Sharding

    Shard keys, chunks, balancer, mongos routing and zone sharding.

11. Change Streams

    Real-time change notifications, resume tokens and event-driven applications.

12. Time Series Collections

    Time series collections, metaField, granularity and bucketing.

13. Schema Validation

    JSON Schema validators, validation levels and actions.

14. WiredTiger Storage Engine

    Document-level concurrency, cache, compression, journaling and checkpoints.

15. Security and Authentication

    Authentication, role-based access control, TLS and encryption.

16. Backup and Restore

    mongodump, snapshots and backup methods.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date