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| Section | Objectives |
|---|---|
| Topic 1: Aggregation Framework | - Data transformation and grouping - Aggregation operators - Aggregation pipeline stages |
| Topic 2: Backup, Restore, and Operations | - Monitoring and maintenance - Restore procedures - Backup strategies and tools |
| Topic 3: Replication and High Availability | - Read/write concerns - Replica set architecture - Failover and elections |
| Topic 4: Indexing and Performance Tuning | - Query performance optimization - Index types and usage - Explain plans and diagnostics |
| Topic 5: MongoDB CRUD Operations | - Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types |
| Topic 6: Sharding and Scalability | - Balancing and scaling operations - Shard keys and distribution strategy - Sharded cluster architecture |
| Topic 7: Data Modeling | - Schema design principles - Embedding vs referencing - Relationships in MongoDB |
| Topic 8: Security | - Authentication and authorization - Encryption at rest and in transit - Role-based access control (RBAC) |
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NEW QUESTION # 39
Which option should be used to update all the documents with the specified condition in the MongoDB query?
Answer: D
NEW QUESTION # 40
Which of the following needs to be performed prior to initiate backup on a sharded cluster?
Answer: A
NEW QUESTION # 41
Which TWO mongosh commands can be used to shutdown the mongod daemon?
Answer: A,B
Explanation:
MongoDB supports a clean server shutdown through the shutdown administrative command and through the mongosh helper db.shutdownServer(). Option A uses db.adminCommand({ shutdown: 1 }), which executes the shutdown command against the admin database and requests an orderly termination of the server process.
Option D explicitly switches to the admin database and calls db.shutdownServer(), the documented shell helper that wraps the same administrative behavior. Option B uses killOp, which terminates a specific database operation identified by an operation ID; port 27017 is not an operation ID and killing an operation is not equivalent to shutting down mongod. Option C uses killAllSessions, which ends logical sessions but leaves the server process running. A controlled shutdown is preferred over abruptly terminating the process because MongoDB can close resources and complete its shutdown procedures cleanly. In replica-set deployments, administrators should also consider whether the member is primary and whether a planned step- down is appropriate before maintenance. Among the commands shown, A and D are the two valid mongosh- based shutdown mechanisms.
Study Guide reference/topic:MongoDB Architecture and Core Operations - clean server shutdown, admin commands, and db.shutdownServer().
NEW QUESTION # 42
What command lists all indexes for a collection?
Answer: C
Explanation:
db.collection.getIndexes() is the mongosh method used to return the definitions of all indexes that currently exist on a collection. The result is an array of index specification documents that can show fields such as the index name, key pattern, index version, uniqueness, partial-filter settings, sparse configuration, collation, and whether the index is hidden. This makes the method useful for index audits, troubleshooting, and confirming the physical indexes available to the query planner. Option A is not a documented method for enumerating collection indexes. Option B resembles the $indexStats aggregation stage, which reports usage statistics for indexes, but db.collection.indexStats() is not the method used to list full index definitions. Option C, findIndexes(), is also not the documented mongosh collection helper. Administrators should distinguish between listing index definitions, examining index usage, and inspecting an individual query ' s winning plan:
getIndexes() addresses the first requirement, $indexStats addresses usage metrics, and explain() addresses query-planner behavior. Therefore option D is the correct command for listing all indexes on the collection.
Study Guide reference/topic:Indexing and Query Optimization - index administration, index metadata, and db.
collection.getIndexes().
NEW QUESTION # 43
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
Answer: B,C
NEW QUESTION # 44
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