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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 |
| Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Logical and physical backup methods - Restore procedures and disaster recovery |
| Monitoring, Performance and Troubleshooting | 10% | - Diagnostics and resolving common issues - Performance tuning and optimization - Monitoring tools and metrics |
| MongoDB Architecture and Deployment | 20% | - Installation and configuration - Storage engines and server management - Core concepts, JSON/BSON, data model |
| Security and Access Control | 15% | - Encryption, auditing, and security best practices - Role-based access control - Authentication mechanisms |
| CRUD Operations and Indexing | 20% | - Create, Read, Update, Delete operations - Query optimization and aggregation - Index types, creation, and management |
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NEW QUESTION # 51
We can insert multiple documents in bulk using which of the following operations:
Answer: B
NEW QUESTION # 52
Which of the following commands will return all the posts with number of likes greater than 100 and less than 200, both inclusive?
Answer: C
NEW QUESTION # 53
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION # 54
What attribute of the oplog ensures consistency in a replicated dataset?
Answer: A
Explanation:
MongoDB describes oplog operations as idempotent. An idempotent operation can be reapplied without causing an unintended cumulative change beyond the intended final state. This property is important for replication and recovery because secondary members copy and apply oplog entries, and operational processes may need to reason safely about replay. MongoDB can represent client write activity in oplog-friendly forms specifically to preserve appropriate replication semantics. Natural ordering is relevant to the capped collection structure of the oplog, but it is not the attribute identified by the question as providing safe repeatable application behavior. Concurrency control governs simultaneous operations and storage-engine coordination rather than the defining form of oplog entries. Flow control is a replica-set mechanism that can regulate the primary ' s write throughput when replication lag threatens majority-commit behavior; it does not make individual oplog entries safe to replay. The idempotent nature of oplog operations supports deterministic replication and contributes to consistent secondary state as operations are applied in sequence. Therefore the correct attribute among the options is Idempotent, making D correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - the oplog, idempotent replication operations, replay, and consistency.
NEW QUESTION # 55
Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:
Which of the following query will return all the documents where the ratings array contains elements that in some combination satisfy the query conditions?
Answer: C
NEW QUESTION # 56
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