C100DBA資格勉強、C100DBA受験対策

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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
MongoDB CRUD Operations	- Working with documents and BSON types - Querying and filtering documents - Insert, update, and delete operations
Data Modeling	- Schema design principles - Embedding vs referencing - Relationships in MongoDB
Indexing and Performance Tuning	- Explain plans and diagnostics - Index types and usage - Query performance optimization
Replication and High Availability	- Failover and elections - Replica set architecture - Read/write concerns
Sharding and Scalability	- Shard keys and distribution strategy - Sharded cluster architecture - Balancing and scaling operations
Security	- Role-based access control (RBAC) - Authentication and authorization - Encryption at rest and in transit
Backup, Restore, and Operations	- Restore procedures - Backup strategies and tools - Monitoring and maintenance
Aggregation Framework	- Aggregation operators - Data transformation and grouping - Aggregation pipeline stages

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MongoDB C100DBA認定試験に対する最も優秀な参考書

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定 C100DBA 試験問題 (Q42-Q47):

質問 # 42
Which of the following is incorrect statement about find and findOne operations in MongoDB?

A. findQ returns all the documents in a collection while findOne() retrieves only the first one.
B. findOneQ returns the actual first document retrieved from a collection
C. find.limit(l) is not the same query as findOne()
D. findQ and findOneQ returns cursors to the collection documents

正解：D

質問 # 43
Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

A. 0
B. 1
C. 2
D. 3
E. 4

正解：D

質問 # 44
Below is a sample document of "orders" collection

A. $sort

正解：A

質問 # 45
What is a limitation of encryption at rest?

A. It protects against insecure network connections.
B. It requires a lot of additional configuration.
C. It can impact performance greatly.
D. It does not protect against data breaches.

正解：D

解説：
Encryption at rest protects persisted database data on storage media, but it is not a complete defense against every form of data exposure or breach. MongoDB ' s encrypted storage capabilities protect files and storage- level data, yet applications and the database server must still process authorized data in usable form. A compromised application account, stolen database credentials, excessive privileges, or a malicious authorized user can therefore expose data even when the underlying storage is encrypted. Network traffic also requires separate transport protection such as TLS; encryption at rest does not secure data as it travels between clients and servers. Option B incorrectly describes transport encryption rather than an at-rest capability. Option A is too subjective and not an inherent limitation, particularly in managed deployments where storage encryption may be enabled automatically. Option D is similarly overstated; encryption adds cryptographic work, but severe performance impact is not an intrinsic defining limitation. The correct security model is defense in depth: combine at-rest encryption with TLS, strong authentication, least-privilege authorization, auditing, and secure key management. Among the choices, C best captures the limitation that at-rest encryption alone cannot prevent all data breaches.
Study Guide reference/topic:Security, Networking, and Encryption - encryption at rest, TLS, authorization, and defense in depth.

質問 # 46
In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

A. mongo shell
B. mongod
C. individual language drivers
D. mongos

正解：C

質問 # 47
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