MongoDB C100DBA최신업데이트버전덤프문제, C100DBA최신업데이트버전인증시험자료

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MongoDB C100DBA Exam Syllabus Topics:

SectionObjectives
Topic 1: Philosophy and Features- MongoDB Architecture
  • 1. Collections and Databases
  • 2. Scalability Concepts
  • 3. Document Model
  • 4. High Availability Concepts
Topic 2: Application Administration- Security and Access Control
  • 1. Authorization
  • 2. Role-Based Access Control
  • 3. Authentication
  • 4. User Management
Topic 3: Server Administration- Database Operations
  • 1. Configuration Management
  • 2. Backup and Restore
  • 3. Storage Management
  • 4. Monitoring
Topic 4: Replication- Replica Sets
  • 1. Primary and Secondary Nodes
  • 2. Write Concerns
  • 3. Elections
  • 4. Read Preferences
Topic 5: Indexes- Index Management
  • 1. Single Field Indexes
  • 2. Compound Indexes
  • 3. Index Selection
  • 4. Query Performance Optimization
Topic 6: Sharding- Cluster Scaling
  • 1. Query Routing
  • 2. Chunk Distribution
  • 3. Shard Keys
  • 4. Balancer Operations
Topic 7: CRUD Operations- Data Manipulation
  • 1. Update Operations
  • 2. Read Queries
  • 3. Insert Operations
  • 4. Delete Operations

>> MongoDB C100DBA최신 업데이트버전 덤프문제 <<

시험패스에 유효한 C100DBA최신 업데이트버전 덤프문제 최신버전 덤프샘풀문제 다운

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최신 MongoDB Certified DBA Associate C100DBA 무료샘플문제 (Q89-Q94):

질문 # 89
Which of the following operator can be used to control the number of items of an array that a query returns?

정답：C


질문 # 90
A collection named scores includes:
[
{ _id: 1, home_score: 6, away_score: [ 5, 7 ] },
{ _id: 2, home_score: [ 8, 6 ], away_score: 9 },
{ _id: 3, home_score: [ 5, 8 ], away_score: [ 9, 6 ] },
{ _id: 4, home_score: 5, away_score: 10 }
]
Given the following index:
db.scores.createIndex( { home_score: 1, away_score: 1 } )
What document will cause the index to fail?

정답：B

설명：
The proposed index is a compound index across home_score and away_score. MongoDB supports compound multikey indexes, but it imposes an important restriction: for any one indexed document, no more than one field covered by the compound index may contain an array. Document 1 is valid because only away_score is an array. Document 2 is also valid because only home_score is an array. Document 4 contains scalar values for both fields. Document 3 contains arrays in both indexed fields: home_score: [5,8] and away_score: [9,6] .
Indexing that document would require a compound multikey index to expand two independent array dimensions, which MongoDB prohibits. Therefore document 3 prevents the compound index from being valid. The restriction is important because a single multikey field already creates multiple index keys per document; allowing multiple independently array-valued keys in the same compound index would create ambiguous and potentially combinatorial key combinations. DBAs designing indexes over document schemas with arrays must understand these multikey constraints before building compound indexes. The failing document is _id:3, making option D correct.
Study Guide reference/topic:Indexing and Query Optimization - multikey indexes, compound multikey restrictions, and array-valued fields.


질문 # 91
What operation updates the value of the unitsInStock field to 25 for a document with a " laptop " product, and inserts a new document if it does not exist?

정답：A

설명：
An upsert combines update behavior with conditional insertion. updateOne() first searches for a document matching { product: " laptop " }. If one exists, $set changes unitsInStock to 25. If none exists and the options document contains { upsert: true }, MongoDB inserts a new document based on the equality portions of the filter together with the update result. Option A uses exactly this pattern. Options B and C incorrectly use insertOne(), which inserts a supplied document and does not accept an update-operator document plus upsert semantics in this form. Option D uses the correct method and update structure but specifies True with a capital T. Mongosh uses JavaScript Boolean syntax, so the literal must be lowercase true. Upserts are useful when an application needs to ensure that a logical entity exists after an operation, but DBAs should consider a unique index on the identifying field when duplicate creation by concurrent requests must be prevented.
Given the choices, updateOne(..., {$set:...}, {upsert:true}) is the valid operation, so A is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - updateOne(), $set, upserts, and Boolean syntax.


질문 # 92
In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

정답：A


질문 # 93
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ {
$group: { _id; "$author", x: { $sum: $likes } } } ] )

정답：B


질문 # 94
......

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