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MongoDB C100DBA Certification Exam is offered by MongoDB, a popular NoSQL database management system that is used by many organizations worldwide. C100DBA exam is designed to test the knowledge and skills of candidates in various areas of MongoDB database administration, including backup and recovery, security, performance tuning, and data modeling.

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q127-Q132):

NEW QUESTION # 127
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?

A. db.inventory.updateOne({ product: " laptop " }, { $set: { unitsInStock: 25 } }, { upsert: true })
B. db.inventory.updateOne({ product: " laptop " }, { $set: { unitsInStock: 25 } }, { upsert: True })
C. db.inventory.insertOne({ product: " laptop " }, { $set: { unitsInStock: 25 } }, { upsert: true })
D. db.inventory.insertOne({ product: " laptop " }, { $set: { unitsInStock: 25 } }, { upsert: True })

Answer: A

Explanation:
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.

NEW QUESTION # 128
Which of the following is a valid insert statement in mongodb? Select all valid.

A. db.test.push({x:2,y: " apple " })
B. db.test.insert({x:2},{y: " apple " })
C. db.test.insert({x:2,y: " apple " })
D. db.test.insert({x " x " :2, " y " : " apple " })

Answer: C,D

NEW QUESTION # 129
Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

A. db.posts.finOne{},{post_text:l})
B. db.posts.find({},{_id:Of post_text:1})
C. db.posts.finOne({},{_id:0, post_text:1})
D. db.posts.findOne({post_text: 1})

Answer: C

NEW QUESTION # 130
Below is a sample document of "orders" collection

Answer:

Explanation:
$sort

NEW QUESTION # 131
Which of the following needs to be performed prior to initiate backup on a sharded cluster?

A. sh.stopBalancer( )
B. db.stopServer( )
C. db.stopBalancer( )
D. sh.stopServer( )

Answer: A

NEW QUESTION # 132
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