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MongoDB C100DBA Certification Exam is designed for database administrators who want to demonstrate their proficiency in managing and deploying MongoDB database systems. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification exam is based on the latest version of MongoDB, version 4.4. It covers a range of topics including database security, data modeling, backup and recovery, performance tuning, and replication.

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q141-Q146):

NEW QUESTION # 141
In what format does mongodump creates backup files?

Answer: D


NEW QUESTION # 142
The MongoDB explain() method does not support which of the following verbosity mode:

Answer: A


NEW QUESTION # 143
MongoDB is

Answer: B


NEW QUESTION # 144
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?

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 # 145
What tool should be used to access and administer a MongoDB cluster?

Answer: C

Explanation:
mongosh, the MongoDB Shell, is the interactive command-line environment used to connect to MongoDB deployments and perform administrative and data operations. Through mongosh, a DBA can run CRUD queries, aggregation pipelines, user and role administration, replica-set commands, server diagnostics, index operations, and many other management tasks. mongod, option B, is the MongoDB database server process itself; it stores data and serves requests but is not the interactive administration client. mongostat, option C, is a monitoring utility that reports a concise stream of server activity metrics such as operation rates, memory, connections, and queue information. mongotop, option D, reports time spent reading and writing data by namespace and is likewise a diagnostic utility rather than a general administration shell. DBAs may also use MongoDB Compass, Atlas interfaces, Ops Manager, or automation tooling depending on the deployment, but among these four command-line tools, mongosh is the one intended for broad interactive access and administration. Therefore option A is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - MongoDB Shell, administration tools, server processes, and monitoring utilities.


NEW QUESTION # 146
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