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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q32-Q37):

NEW QUESTION # 32
In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)

A. Skip and limit nullify each other. Hence returning the first five documents
B. Limits the first five documents and then return them in reverse order
C. Skips the first five documents and returns the sixth document five times
D. Skips the first five documents and returns the next five

Answer: D

NEW QUESTION # 33
'$set' sets the value of

A. Name/value pair
B. Key
C. Code block
D. None of the above

Answer: B

NEW QUESTION # 34
JSON stands for

A. JavaScript Object Naming
B. JavaScript Object Notation
C. JavaScript Object Notice
D. None of the above

Answer: B

NEW QUESTION # 35
Which TWO commands can be used to check for all active operations on the current node?

A. db.currentOp({ " all " : true })
B. db.currentOp({ op : " command " })
C. db.currentOp(true)
D. db.adminCommand({ " all " : currentOp})
E. db.adminCommand({ currentOp : true })

Answer: C,E

Explanation:
db.currentOp() is the mongosh helper used to inspect operations currently executing on a MongoDB server.
Passing true requests a broad view that includes all in-progress operations as well as additional idle/system entries, so it can be used when the administrator wants to see the complete current-operation picture. The database-command form, db.adminCommand({ currentOp: true }), invokes the corresponding administrative command and is also valid for obtaining in-progress operation information. Option A adds a filter restricting the result to operations whose op field is " command " ; it therefore does not represent all operation types.
Option B is not valid currentOp command syntax, and option E uses an all field that is not the documented special form for this helper. In modern MongoDB administration, the $currentOp aggregation stage is generally preferred for richer filtering and aggregation, but the question is testing the traditional helper and command interfaces. Therefore, C and D are the two valid choices among those presented.
Study Guide reference/topic:Performance Monitoring and Tuning - current operations, currentOp, and administrative diagnostics.

NEW QUESTION # 36
What is the output of following two commands in MongoDB: db. posts. insert({n_id " :l}) db.posts.insert({ "
_id " :l})

A. It will insert two documents and throw a warning to the user
B. MongoDB will automatically increment the _id of the second document as 2
C. Two documents will be inserted with _id as 1
D. This will throw a duplicate key error

Answer: D

NEW QUESTION # 37
......

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