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| Section | Objectives |
|---|---|
| Aggregation Framework | - Aggregation operators - Aggregation pipeline stages - Data transformation and grouping |
| Sharding and Scalability | - Sharded cluster architecture - Balancing and scaling operations - Shard keys and distribution strategy |
| Indexing and Performance Tuning | - Query performance optimization - Explain plans and diagnostics - Index types and usage |
| MongoDB CRUD Operations | - Insert, update, and delete operations - Working with documents and BSON types - Querying and filtering documents |
| Data Modeling | - Embedding vs referencing - Schema design principles - Relationships in MongoDB |
| Backup, Restore, and Operations | - Monitoring and maintenance - Backup strategies and tools - Restore procedures |
| Security | - Authentication and authorization - Encryption at rest and in transit - Role-based access control (RBAC) |
| Replication and High Availability | - Replica set architecture - Read/write concerns - Failover and elections |
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NEW QUESTION # 130
Which mongodb tool is used to report details on number of database operations in MongoDB?
Answer: B
NEW QUESTION # 131
In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?
Answer: A
NEW QUESTION # 132
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 # 133
What command should a MongoDB database administrator use to find the disk utilization of the order collection?
Answer: C
Explanation:
db.collection.stats() returns statistics for a specific collection, including storage-related values that help a DBA understand that collection ' s disk footprint. Therefore, for a collection named order, db.order.stats() is the relevant command among the choices. The result can include metrics such as logical data size, allocated storage size, document count, index information, and related collection statistics depending on version and storage engine. Option A, db.stats(), reports database-level statistics aggregated across the database rather than isolating the order collection. db.hostInfo(), option C, reports host and operating-system information rather than collection storage consumption. db.serverStatus(), option D, provides broad server-process runtime metrics such as connections, memory, operation counters, replication/storage-engine information, and other health data, but it is not the collection-specific disk-utilization interface requested here. Administrators can also use dedicated helpers such as collection storage-size or total-size methods when they need a more narrowly defined measurement. For a general collection-level statistics query targeting order, however, db.
order.stats() is the correct answer, making option B correct.
Study Guide reference/topic:Performance Monitoring and Tuning - collection statistics, storage utilization, db.
collection.stats(), and database/server metrics.
NEW QUESTION # 134
In a replica set, which member is responsible for maintaining copies of the primary ' s data?
Answer: B
Explanation:
A replica-set secondary maintains a replicated copy of the primary ' s dataset. The primary records data- changing operations in its oplog, and secondary members continuously copy and apply those oplog entries asynchronously to keep their data synchronized. This redundancy allows an eligible secondary to participate in an election and potentially become primary if the current primary becomes unavailable. mongos, option B, is the query-routing process used in a sharded cluster; it does not store an application dataset copy. An arbiter, option C, participates in replica-set voting and elections but deliberately does not maintain a copy of the database data. A shard, option D, is a data partition in a sharded cluster and is normally implemented as a replica set in production, but "shard" is not the replica-set member role that replicates the primary ' s data.
Secondary behavior is central to MongoDB high availability, read-scaling options, backup strategies, and failover. Administrators monitor secondary replication lag and health to ensure the copies remain sufficiently current. Therefore the member responsible for maintaining copies of the primary ' s data is the secondary, making option A correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set primaries, secondaries, oplog replication, and redundancy.
NEW QUESTION # 135
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