C100DBA必殺問題集 & C100DBA最新資料

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MongoDB C100DBA Exam Syllabus Topics:

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

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最新のC100DBA必殺問題集 & 資格試験におけるリーダーオファー & 唯一無二C100DBA: MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定 C100DBA 試験問題 (Q19-Q24):

質問 # 19
A MongoDB administrator needs to create a new role with only the read privileges for the products database.
What command should the administrator use?

正解：B

解説：
MongoDB custom roles are defined in terms of privileges, and each privilege specifies a resource plus one or more allowed actions. For read/query access, find is a valid privilege action. To represent all normal collections in a specified database, MongoDB uses a resource document with the target database and an empty collection name, for example { db: " products " , collection: " " }. Option B therefore combines the correct resource scope with the find action and does not grant write capability. The distractors confuse built-in role names with privilege actions. read, readWrite, and readAnyDatabase are built-in roles or role concepts, not the appropriate action values for the privileges[].actions list shown here. Likewise, a literal " * " collection value is not the documented database-wide resource form for this custom privilege. In practice, an administrator could also assign MongoDB ' s built-in read role rather than creating a custom role if its permissions exactly match the requirement. Given the specific createRole() choices, however, option B is the technically correct construction.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, custom roles, resources, and privilege actions.


質問 # 20
What stage of the Winning Plan in an Explain Result identifies the Index Key for the query pattern?

正解：A

解説：
When MongoDB ' s winning query plan uses a B-tree index, the plan includes an IXSCAN stage. That stage contains the index-specific information a DBA needs to identify how the query is being serviced, including the key pattern, index name, traversal direction, and index bounds. For example, keyPattern can show a compound definition such as { status: 1, createdAt: -1 }, making it straightforward to confirm which indexed keys participate in the chosen plan. A FETCH stage indicates that MongoDB is retrieving full documents, often after an index has produced candidate record identifiers; the fetch stage itself does not identify the index key. A COLLSCAN stage means MongoDB is scanning the collection and therefore is not using a normal index scan for the predicate. GROUP is unrelated to index selection. Effective DBA query analysis usually involves inspecting both queryPlanner.winningPlan and execution statistics such as totalKeysExamined, totalDocsExamined, and nReturned. But for the narrow question of which stage exposes the index key used by the winning plan, IXSCAN is the correct answer. Therefore option C is correct.
Study Guide reference/topic:Indexing and Query Optimization - explain output, winning plans, IXSCAN, key patterns, and index bounds.


質問 # 21
You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?

正解：A


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

正解：B

解説：
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.


質問 # 23
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

正解：B


質問 # 24
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