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| Section | Objectives |
|---|---|
| Topic 1: Backup, Restore, and Operations | - Monitoring and maintenance - Restore procedures - Backup strategies and tools |
| Topic 2: MongoDB CRUD Operations | - Working with documents and BSON types - Insert, update, and delete operations - Querying and filtering documents |
| Topic 3: Security | - Authentication and authorization - Encryption at rest and in transit - Role-based access control (RBAC) |
| Topic 4: Sharding and Scalability | - Balancing and scaling operations - Shard keys and distribution strategy - Sharded cluster architecture |
| Topic 5: Aggregation Framework | - Aggregation pipeline stages - Aggregation operators - Data transformation and grouping |
| Topic 6: Data Modeling | - Relationships in MongoDB - Embedding vs referencing - Schema design principles |
| Topic 7: Indexing and Performance Tuning | - Index types and usage - Query performance optimization - Explain plans and diagnostics |
| Topic 8: Replication and High Availability | - Read/write concerns - Failover and elections - Replica set architecture |
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NEW QUESTION # 129
What " stage " indicates that no indexes were available for a query pattern?
Answer: C
Explanation:
In MongoDB explain output, a COLLSCAN stage means the winning plan is scanning documents in the collection rather than traversing a suitable index. This is the clearest indicator that the query is not being serviced by a normal index scan for the relevant predicate. By contrast, IXSCAN explicitly indicates an index scan and typically includes details such as the index key pattern, direction, and bounds. A FETCH stage represents retrieval of full documents, often after an index has already identified candidate record locations; its presence does not imply that no index was used. GROUP relates to grouping behavior and is not the stage used to identify missing index support. A collection scan is not automatically wrong: for tiny collections or queries that return most documents, it can be efficient. However, on large collections with selective predicates, repeated COLLSCAN plans are a strong signal that the DBA should evaluate indexing.
Administrators should compare totalDocsExamined, totalKeysExamined, execution time, and the winning
/rejected plans before deciding to add an index. For the terminology tested by the question, COLLSCAN is the correct stage, so C is correct.
Study Guide reference/topic:Indexing and Query Optimization - explain plans, COLLSCAN, IXSCAN, and missing index diagnostics.
NEW QUESTION # 130
Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.
Answer: C
NEW QUESTION # 131
Which mongodb tools allow us to work with our data in a human readable format?
Answer: A,D
NEW QUESTION # 132
You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?
Answer: B
NEW QUESTION # 133
In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?
Answer: A
NEW QUESTION # 134
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