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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q40-Q45):

NEW QUESTION # 40
What command returns all documents in an orders collection where quantity is less than or equal to 1000 and salesRep is not equal to " Anne " ?

Answer: A

Explanation:
The quantity condition is "less than or equal to 1000," which maps to MongoDB ' s $lte comparison operator.
The sales representative condition is "not equal to Anne," which maps to $ne. When predicates on two different fields appear in the same query document, MongoDB applies an implicit logical AND, so both conditions must be true for a document to match. Option C therefore expresses exactly the requested filter: { quantity: { $lte: 1000 }, salesRep: { $ne: " Anne " } }. Options A and D use $neq, which is not MongoDB ' s inequality operator. Options B and D use $lt, which excludes documents whose quantity is exactly 1000 and therefore fails the "less than or equal" requirement. One nuance of $ne is that it can also match documents where the field is missing, because a missing field is not equal to the specified value. If the application requires salesRep to exist as well, an explicit existence predicate may be appropriate. For the wording shown, however, option C is the correct command.
Study Guide reference/topic:MongoDB Architecture and Core Operations - comparison predicates, $lte, $ne, and implicit AND semantics.


NEW QUESTION # 41
What is the defau size of a GridFS chunk?

Answer: D


NEW QUESTION # 42
What command adds a document to the class101 collection where the student is " Randall " and the student passed the class?

Answer: D

Explanation:
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.


NEW QUESTION # 43
Which of the following about Capped Collections is correct?

Answer: C


NEW QUESTION # 44
Which of the following node is used during election in a replication cluster?

Answer: A


NEW QUESTION # 45
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