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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定 C100DBA 試験問題 (Q38-Q43):

質問 # 38
Which of the following is a valid insert statement in mongodb? Select all valid.

正解：A、C


質問 # 39
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >

正解：E


質問 # 40
Consider the following example document:
{
"_id": Objectld("5360c0a0a655a60674680bbe"),
"user"
"login": "irOn"
"description": "Made of steel"
"date": ISODate("2014-04-30T09:16:45.836Z"),
}
>
and index creation command:
db.users.createlndex( { "user.login": 1, "user.date": -1 }, "mylndex" )
When performing the following query:
db.users.find( { "user.login": /Air.*/ }, { "user":1, "_id":0 } ).sort( { "user.date":1 } )
which of the following statements correctly describe how MongoDB will handle the query? Check all that apply.

正解：A


質問 # 41
What command adds a document to the class101 collection where the student is " Randall " and the student passed the class?

正解：A

解説：
db.collection.insertOne() inserts one BSON document into a collection. In mongosh, string values must be quoted and Boolean literals use JavaScript syntax: lowercase true or false. Therefore the student ' s name must appear as " Randall " , and the passed flag must be true. Option D is the only choice that gets both value types correct. Option A quotes the string properly but uses True, which is not the JavaScript Boolean literal.
Options B and C leave Randall unquoted, so mongosh would interpret it as an identifier or variable rather than as the literal string required by the document. Option C additionally uses the invalid capitalized Boolean form.
If an _id field is omitted, MongoDB automatically adds a unique _id, typically an ObjectId, before storing the document. That behavior does not affect the two requested fields. This question tests both CRUD syntax and the BSON/JavaScript literal representation used by mongosh. The correct command is db.class101.insertOne ({ student: " Randall " , passed: true }), so option D is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - insertOne(), BSON values, strings, Booleans, and automatic _id.


質問 # 42
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?

正解：E


質問 # 43
......

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