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| Section | Objectives |
|---|---|
| Topic 1: Data Modeling | - Embedding vs referencing - Relationships in MongoDB - Schema design principles |
| Topic 2: Replication and High Availability | - Read/write concerns - Replica set architecture - Failover and elections |
| Topic 3: Indexing and Performance Tuning | - Index types and usage - Explain plans and diagnostics - Query performance optimization |
| Topic 4: Sharding and Scalability | - Shard keys and distribution strategy - Sharded cluster architecture - Balancing and scaling operations |
| Topic 5: Aggregation Framework | - Aggregation pipeline stages - Aggregation operators - Data transformation and grouping |
| Topic 6: MongoDB CRUD Operations | - Working with documents and BSON types - Querying and filtering documents - Insert, update, and delete operations |
| Topic 7: Backup, Restore, and Operations | - Monitoring and maintenance - Backup strategies and tools - Restore procedures |
| Topic 8: Security | - Encryption at rest and in transit - Authentication and authorization - Role-based access control (RBAC) |
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NEW QUESTION # 163
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
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