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MongoDB C100DBA exam covers a range of topics related to MongoDB administration, including installation and configuration, security, backup and recovery, performance tuning, and scaling. C100DBA exam consists of 60 multiple-choice questions and must be completed within 90 minutes. The passing score for the exam is 75%, and you will receive your results immediately after completing the exam.

MongoDB C100DBA is a certification exam designed for individuals aspiring to become certified MongoDB DBAs. C100DBA exam is based on MongoDB version 4.4, the latest version of the popular document-oriented NoSQL database. MongoDB is widely used by organizations of all sizes to build and manage modern applications that require high-performance, scalability, and availability.

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q33-Q38):

NEW QUESTION # 33
Which type of indexes does MongoDB support?

A. Multikey Indexes
B. Geospatial Indexes
C. Compound Indexes
D. All of the above

Answer: D

NEW QUESTION # 34
The MongoDB explain() method does not support which of the following verbosity mode:

A. queryPlanner
B. executionStats
C. customExecutionStats
D. allPlansExecution

Answer: B

NEW QUESTION # 35
Consider that our posts collection contains an array field called tags that contains tags that the user enters. {

Which of the following commands will find all the posts that have been tagged as tutorial.

A. db.posts.find( { tags : "tutorial" } );
B. db.posts.findInArray( { tags : "tutorial" > );
C. db.posts.find( { $array : {tags: "tutorial") > );
D. db.posts.find( { tags : ["tutorial"] } );

Answer: A

NEW QUESTION # 36
Consider an orders collection that contains these documents:
{ _id: 1, product: " X-pad " , quantity: 950 }
{ _id: 2, product: " X-pad-pro " , quantity: 1000 }
{ _id: 3, product: " X-phone " , quantity: 850 }
{ _id: 4, product: " X-phone-pro " , quantity: 1350 }
Commands A and B are run at the same time. Assume that no other operations are running.

A. )db.orders.findAndModify({query: { " product " : " X-phone " },update: { $set: { " quantity " : 1250 }
}})
B. findAndModify output shows quantity 1250; final X-phone quantity is 1250 while all others are 0.
C. findAndModify output shows quantity 850; final quantities for all four documents are 0.
D. )db.orders.updateMany({}, { $set: { " quantity " : 0 } })What is the possible findAndModify output and database state after these operations complete? Select TWO.
E. findAndModify output shows quantity 0; final X-phone quantity is 1250 while all others are 0.
F. findAndModify output shows quantity 0; final quantities for all four documents are 0.

Answer: C,D

Explanation:
The result depends on how the two concurrent operations interleave at document _id:3. MongoDB guarantees atomicity for each individual document write, but updateMany() is not atomic across the complete set of matching documents. Other operations can run between its per-document modifications. findAndModify also returns the pre-modification version of the selected document by default unless configured to return the updated version. If findAndModify reaches the X-phone first, it observes quantity 850, returns that pre-image, and sets the value to 1250. The concurrent updateMany() can subsequently reach the same document and set it to 0, producing option B. In another valid interleaving, updateMany() first sets the X-phone quantity to 0.
findAndModify then selects that document, returns the pre-image showing 0, and sets the value to 1250.
Because updateMany() has already processed that document, the final value can remain 1250, producing option D. Options A and C do not correctly reflect the default pre-image return behavior together with the possible per-document interleavings. Therefore B and D are both valid outcomes.
Study Guide reference/topic:MongoDB Architecture and Core Operations - single-document atomicity, concurrent writes, findAndModify, and updateMany.

NEW QUESTION # 37
Which of the following about Capped Collections is correct?

A. Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"
B. If the allocated space for a capped collection exceeds, it stops inserting new documents
C. High-throughput operations that insert and retrieve documents based on insertion order
D. Fixed Size

Answer: A

NEW QUESTION # 38
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