Updated C100DBA Dumps - Question C100DBA Explanations

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MongoDB C100DBA Exam Syllabus Topics:

SectionObjectives
Philosophy and Features- MongoDB Architecture
  • 1. Scalability Concepts
  • 2. Document Model
  • 3. Collections and Databases
  • 4. High Availability Concepts
Indexes- Index Management
  • 1. Query Performance Optimization
  • 2. Index Selection
  • 3. Single Field Indexes
  • 4. Compound Indexes
Application Administration- Security and Access Control
  • 1. Role-Based Access Control
  • 2. Authorization
  • 3. Authentication
  • 4. User Management
Replication- Replica Sets
  • 1. Primary and Secondary Nodes
  • 2. Elections
  • 3. Read Preferences
  • 4. Write Concerns
Server Administration- Database Operations
  • 1. Monitoring
  • 2. Configuration Management
  • 3. Backup and Restore
  • 4. Storage Management
Sharding- Cluster Scaling
  • 1. Query Routing
  • 2. Chunk Distribution
  • 3. Balancer Operations
  • 4. Shard Keys
CRUD Operations- Data Manipulation
  • 1. Read Queries
  • 2. Insert Operations
  • 3. Update Operations
  • 4. Delete Operations

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Question C100DBA Explanations & C100DBA Interactive Course

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q171-Q176):

NEW QUESTION # 171
What does the totalKeysExamined field returned by the explain method indicate?

Answer: A


NEW QUESTION # 172
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?

Answer: E


NEW QUESTION # 173
Which of the following statements are true about the $match pipeline operator? Check all that apply.

Answer: A,B,C


NEW QUESTION # 174
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ {
$group: { _id; "$author", x: { $sum: $likes } } } ] )

Answer: B


NEW QUESTION # 175
What command is used to check the value that " logLevel " is set to?

Answer: D

Explanation:
logLevel is a MongoDB server parameter, and server parameters are retrieved through the administrative getParameter database command. The documented and unambiguous mongosh form is db.adminCommand({ getParameter: 1, logLevel: 1 }), which executes the command against the admin database and requests the current value of logLevel. The first numeric value activates the command, while the logLevel field identifies the parameter to return. Options B and C refer to a db.getParameter() helper that is not the documented interface. Option A uses db.runCommand() without explicitly switching to the admin database. Because getParameter is an administrative command, db.adminCommand() is the correct and reliable form among the choices. Administrators use server parameters to inspect and, where supported, tune aspects of mongod or mongos behavior. logLevel controls global diagnostic verbosity, while component-specific verbosity can be managed through the logging configuration. For this question, option D precisely matches the expected administrative syntax. Checking the current value before changing logging settings is also a sound operational practice during troubleshooting.
Study Guide reference/topic:Performance Monitoring and Tuning - runtime server parameters, logging configuration, and getParameter.


NEW QUESTION # 176
......

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