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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q18-Q23):

NEW QUESTION # 18
What does the totalKeysExamined field returned by the explain method indicate?

Answer: C


NEW QUESTION # 19
What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?

Answer: A


NEW QUESTION # 20
What are the audit log destinations? (Select three)

Answer: A,B,C

Explanation:
MongoDB Enterprise auditing supports three standard destination values for audit events: syslog, file, and console. With the syslog destination, audit records are sent to the operating system ' s syslog facility where supported. With the file destination, events are written to a configured audit log path, and administrators can control the output format according to the supported audit configuration. With the console destination, audit events are emitted to standard output, which can be useful in containerized or centrally collected logging environments. A raw TCP/IP port is not itself an auditLog.destination value. Organizations can certainly forward logs over the network using operating-system or observability tooling, but that transport is external to MongoDB ' s destination setting. A MongoDB database is likewise not one of the supported audit destinations; keeping audit evidence independent from the system being audited is also preferable for integrity and compliance. Auditing records security-relevant actions and can be filtered to meet regulatory or operational requirements. Therefore the three valid destinations among the choices are syslog, file, and console: A, B, and E.
Study Guide reference/topic:Security, Networking, and Encryption - auditing, auditLog.destination, compliance logging, and audit configuration.


NEW QUESTION # 21
Which of the following does MongoDB use to provide High Availability and fault tolerance?

Answer: C


NEW QUESTION # 22
What is the purpose of elections in a replica set?

Answer: D

Explanation:
Replica-set elections determine which eligible member serves as primary. An election can occur after the current primary becomes unavailable, after certain reconfigurations, during replica-set initialization, or when a primary is deliberately stepped down. Eligible voting members exchange election information and, when a candidate obtains the required support, that candidate transitions to primary and begins accepting writes.
Option A describes asynchronous replication through the oplog, which is a separate mechanism. Option C is unrelated: index creation is an administrative database operation, not a function of elections. Option D is also incorrect because elections do not add members to the replica-set configuration; adding a secondary requires an explicit membership change such as rs.add() or equivalent configuration management. Elections are the foundation of automatic failover and are one reason MongoDB replica sets can provide high availability without a human manually designating a replacement primary after every failure. During an election there can be a brief period in which writes are unavailable, so applications should use retryable behavior and appropriate driver topology handling. The purpose described in option B is therefore correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set elections, primary selection, voting, and automatic failover.


NEW QUESTION # 23
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