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| Section | Objectives |
|---|---|
| Topic 1: Indexing and Performance Tuning | - Query performance optimization - Explain plans and diagnostics - Index types and usage |
| Topic 2: Sharding and Scalability | - Balancing and scaling operations - Sharded cluster architecture - Shard keys and distribution strategy |
| Topic 3: Security | - Authentication and authorization - Role-based access control (RBAC) - Encryption at rest and in transit |
| Topic 4: Data Modeling | - Schema design principles - Relationships in MongoDB - Embedding vs referencing |
| Topic 5: Replication and High Availability | - Replica set architecture - Read/write concerns - Failover and elections |
| Topic 6: Aggregation Framework | - Aggregation pipeline stages - Aggregation operators - Data transformation and grouping |
| Topic 7: Backup, Restore, and Operations | - Backup strategies and tools - Restore procedures - Monitoring and maintenance |
| Topic 8: MongoDB CRUD Operations | - Working with documents and BSON types - Querying and filtering documents - Insert, update, and delete operations |
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NEW QUESTION # 148
Which of the following collections stores authentication credentials in MongoDB?
Answer: B
NEW QUESTION # 149
Which command can be used to rebuild the indexes on a collection in MongoDB?
Answer: C
NEW QUESTION # 150
Consider the following example document from the sample collection. All documents in this collection have the same schema.
Which of the following queries will replace this with the document.
Answer: A
NEW QUESTION # 151
What command lists all indexes for a collection?
Answer: B
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 # 152
MongoDB is a schema-less design.
Answer: A
NEW QUESTION # 153
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