C100DBA Exam Study Guide | C100DBA Valid Test Notes

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MongoDB C100DBA Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Sharding and Scalability10%- Query routing and cluster operations
- Shard keys, chunk management, balancing
- Sharded cluster architecture
Topic 2: Backup, Recovery and Maintenance10%- Restore procedures and disaster recovery
- Logical and physical backup methods
- Data consistency and integrity checks
Topic 3: Security and Access Control15%- Authentication mechanisms
- Encryption, auditing, and security best practices
- Role-based access control
Topic 4: Replication and High Availability15%- Replica set architecture and components
- Deployment and maintenance of replica sets
- Failover, elections, read/write concern
Topic 5: CRUD Operations and Indexing20%- Create, Read, Update, Delete operations
- Query optimization and aggregation
- Index types, creation, and management
Topic 6: Monitoring, Performance and Troubleshooting10%- Monitoring tools and metrics
- Diagnostics and resolving common issues
- Performance tuning and optimization
Topic 7: MongoDB Architecture and Deployment20%- Core concepts, JSON/BSON, data model
- Storage engines and server management
- Installation and configuration

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q115-Q120):

NEW QUESTION # 115
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: B


NEW QUESTION # 116
Which of the following is supported by MongoDB?

Answer: D


NEW QUESTION # 117
Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

Answer: D


NEW QUESTION # 118
Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

Which of the following commands will find all the posts that have been tagged as tutorial.

Answer: C


NEW QUESTION # 119
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: D

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 # 120
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