100％合格率のC100DBA受験準備 &合格スムーズC100DBA問題集 |信頼できるC100DBA技術問題

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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定 C100DBA 試験問題 (Q158-Q163):

質問 # 158
What attribute of the oplog ensures consistency in a replicated dataset?

正解：A

解説：
MongoDB describes oplog operations as idempotent. An idempotent operation can be reapplied without causing an unintended cumulative change beyond the intended final state. This property is important for replication and recovery because secondary members copy and apply oplog entries, and operational processes may need to reason safely about replay. MongoDB can represent client write activity in oplog-friendly forms specifically to preserve appropriate replication semantics. Natural ordering is relevant to the capped collection structure of the oplog, but it is not the attribute identified by the question as providing safe repeatable application behavior. Concurrency control governs simultaneous operations and storage-engine coordination rather than the defining form of oplog entries. Flow control is a replica-set mechanism that can regulate the primary ' s write throughput when replication lag threatens majority-commit behavior; it does not make individual oplog entries safe to replay. The idempotent nature of oplog operations supports deterministic replication and contributes to consistent secondary state as operations are applied in sequence. Therefore the correct attribute among the options is Idempotent, making D correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - the oplog, idempotent replication operations, replay, and consistency.


質問 # 159
You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

正解：C


質問 # 160
Update If Correct is an approach for which of the following concepts in MongoDB:

正解：D


質問 # 161
What are the audit log destinations? (Select three)

正解：A、C、D

解説：
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.


質問 # 162
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?

正解：C


質問 # 163
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