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| Section | Weight | Objectives |
|---|---|---|
| Replication and High Availability | 15% | - Deployment and maintenance of replica sets - Failover, elections, read/write concern - Replica set architecture and components |
| Sharding and Scalability | 10% | - Sharded cluster architecture - Query routing and cluster operations - Shard keys, chunk management, balancing |
| MongoDB Architecture and Deployment | 20% | - Installation and configuration - Storage engines and server management - Core concepts, JSON/BSON, data model |
| Security and Access Control | 15% | - Role-based access control - Encryption, auditing, and security best practices - Authentication mechanisms |
| CRUD Operations and Indexing | 20% | - Create, Read, Update, Delete operations - Index types, creation, and management - Query optimization and aggregation |
| Monitoring, Performance and Troubleshooting | 10% | - Performance tuning and optimization - Diagnostics and resolving common issues - Monitoring tools and metrics |
| Backup, Recovery and Maintenance | 10% | - Restore procedures and disaster recovery - Data consistency and integrity checks - Logical and physical backup methods |
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NEW QUESTION # 141
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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