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| Section | Objectives |
|---|---|
| MongoDB CRUD Operations | - Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types |
| Aggregation Framework | - Data transformation and grouping - Aggregation pipeline stages - Aggregation operators |
| Security | - Encryption at rest and in transit - Role-based access control (RBAC) - Authentication and authorization |
| Sharding and Scalability | - Sharded cluster architecture - Balancing and scaling operations - Shard keys and distribution strategy |
| Backup, Restore, and Operations | - Monitoring and maintenance - Restore procedures - Backup strategies and tools |
| Data Modeling | - Relationships in MongoDB - Embedding vs referencing - Schema design principles |
| Indexing and Performance Tuning | - Query performance optimization - Explain plans and diagnostics - Index types and usage |
| Replication and High Availability | - Replica set architecture - Read/write concerns - Failover and elections |
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NEW QUESTION # 26
Given the following MongoDB document in the users collection:
{ " userid " : 1, " first " : " John " , " roles " : " Basic " }
Which statement results in this document?
{ " userid " : 1, " first " : " John " , " roles " : " SuperUser " }
Answer: A
Explanation:
replaceOne() replaces the matched document ' s content with the replacement document, except that the immutable _id value is preserved when it is not explicitly changed. Ordinary application fields that are omitted from the replacement disappear. The required final document must retain userid, retain first, and change roles to " SuperUser " . Option B supplies all three fields and therefore produces the requested document structure. Option A omits userid, so that ordinary field would be removed from the replacement.
Option C omits both userid and first, leaving only roles in addition to the preserved _id. Option D incorrectly uses the update operator $set inside a replacement document. $set belongs with update operations such as updateOne() or updateMany(); a replaceOne() replacement must be a replacement document rather than an update-operator document. This distinction is important for DBAs and application developers because accidental use of a partial replacement can delete fields that were intended to remain. If the goal is only to change one field, updateOne({userid:1}, {$set:{roles: " SuperUser " }}) would normally be safer. Given the choices, B is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - replaceOne(), full-document replacement, and update-versus-replacement semantics.
NEW QUESTION # 27
Which of the following statements are true about the $match pipeline operator? Check all that apply.
Answer: A,B,C
NEW QUESTION # 28
What command set removes node-1.cluster1.mycompany.local:27017 and node-2.cluster1.mycompany.local:
27017 from the replica set, then adds node-1.cluster1.mycompany.local:27017 back to the replica set?
Answer: C
Explanation:
The supported mongosh helpers for replica-set membership changes are rs.remove() and rs.add(). rs.remove (hostname) removes the member whose host string matches the supplied host:port, while rs.add() adds a new member using either a host string or a member configuration document that includes a host field. Option C uses those documented methods in the required sequence: remove node 1, remove node 2, then add node 1 back. The names rs.removeNode() and rs.addNode() shown in the other options are not standard MongoDB replica-set helper methods. Membership changes must be performed carefully because modifying voting or data-bearing membership can affect majority calculations, elections, and availability. Administrators normally execute membership changes while connected to the current primary, allow configuration propagation, and verify replica-set health afterward with rs.status() or related diagnostics. If a removed data-bearing node is later re-added, it may need to synchronize depending on how far its data has diverged from the current replica- set history. Among the choices, option C is the only valid command sequence.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set membership, rs.remove(), rs.
add(), and topology changes.
NEW QUESTION # 29
What does the following $slice query return using the following command? db.posts.find( {}, { comments: { $slice: [ -10, 5 ] } } )
Answer: C
NEW QUESTION # 30
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
Answer: D
NEW QUESTION # 31
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