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MongoDB C100DBA Exam consists of 60 multiple-choice questions and has a time limit of 90 minutes. Candidates must achieve a score of at least 65% to pass the exam and earn the MongoDB Certified DBA Associate certification. C100DBA exam is delivered online and can be taken from anywhere in the world. Candidates who pass the exam can demonstrate to potential employers that they have the skills and knowledge required to manage MongoDB databases effectively.

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MongoDB C100DBA Certification is an essential credential for professionals working with MongoDB databases. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification is recognized globally and is highly valued by employers in various industries. It serves as a testament to the candidate's skills and knowledge in MongoDB database administration and provides them with a competitive edge in the job market. With the growing demand for MongoDB database administrators, obtaining this certification can open up new career opportunities and help professionals advance in their careers.

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q130-Q135):

NEW QUESTION # 130
Which of the following are common uses of the mongo shell? Check all that apply

A. Use as a JavaScript framework for your production system
B. Perform queries against MongoDB collections
C. Perform administrative tasks

Answer: B,C

NEW QUESTION # 131
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 # 132
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

A. update users collection and restart mongodb
B. update users collection and run db.enableAuthenticationQ
C. All of the above
D. update users collection and restart mongodb with -auth option

Answer: D

NEW QUESTION # 133
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

A. db.posts.createIndex({commerits.$.author " :-l});
B. db.posts.createIndex({comments.$.author " : {$desc:l > });
C. db.posts.createIndex({comments.author " :-l});

Answer: C

NEW QUESTION # 134
A MongoDB administrator is managing a database for a hospital system.
The patients collection contains:
- Carlos Martinez, diagnosis Hypertension, room 203
- Maria Lopez, diagnosis Hypertension, room 207
- Juan Perez, diagnosis Arrhythmia, room 207
The administrator runs:
db.patients.updateMany(
{ diagnosis: " Hypertension " },
{ $set: { room: 207 } }
)
What output should the administrator expect?

A. acknowledged: true, matchedCount: 1, modifiedCount: 1
B. acknowledged: true, matchedCount: 3, modifiedCount: 1
C. acknowledged: true, matchedCount: 1, modifiedCount: 2
D. acknowledged: true, matchedCount: 2, modifiedCount: 1

Answer: D

Explanation:
updateMany() distinguishes between documents that match the filter and documents whose stored data actually changes. The filter { diagnosis: " Hypertension " } matches Carlos Martinez and Maria Lopez, so matchedCount is 2. Carlos currently has room: 203, and $set: { room: 207 } changes his document, contributing one to modifiedCount. Maria already has room: 207. She still satisfies the filter and therefore counts as a match, but setting a field to the value it already contains does not produce a material modification, so she does not increment modifiedCount. Juan Perez has diagnosis Arrhythmia, so he is neither matched nor modified. The resulting acknowledged operation therefore reports matchedCount: 2 and modifiedCount: 1, corresponding to option D. This distinction is essential when validating whether an update actually changed stored values rather than merely identifying matching records. This distinction is operationally important: a large difference between matched and modified counts can indicate that many matching documents already contained the requested state, not that the update failed. DBAs should use both counters when validating bulk- update behavior.
Study Guide reference/topic:MongoDB Architecture and Core Operations - updateMany(), $set, matchedCount, and modifiedCount.

NEW QUESTION # 135
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