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MongoDB C100DBA certification is globally recognized and highly valued in the IT industry. It demonstrates a candidate's proficiency in managing MongoDB databases and their ability to optimize database performance and ensure high availability. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification is also a testament to a candidate's commitment to continuous learning and professional development in the field of database administration.

The C100DBA certification exam is ideal for individuals who have experience working with MongoDB and want to enhance their skills and knowledge in administering MongoDB databases. C100DBA Exam is also suitable for individuals who are new to MongoDB but have a background in database administration and want to switch to NoSQL databases. Passing the C100DBA exam demonstrates that an individual is capable of performing the tasks required of a MongoDB DBA and has a comprehensive understanding of MongoDB database administration.

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q14-Q19):

NEW QUESTION # 14
Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

A. db.posts.find( { post_timestamp : { $type; 10 > > )
B. db.posts.find( { post_timestamp: { $fieldtype: 10 } } )
C. db.posts.find( { post_timestamp: { $fieldtype: null } } )
D. db.posts.find( { post_timestamp: { $type: null } } )

Answer: A

NEW QUESTION # 15
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

A. Updating a document is possible only with $set
B. Syntax error
C. Replaces the complete document with _id as 1 with the document specified in second parameter
D. Updates the Title of the post

Answer: C

NEW QUESTION # 16
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: 3, modifiedCount: 1
B. acknowledged: true, matchedCount: 1, modifiedCount: 1
C. acknowledged: true, matchedCount: 2, modifiedCount: 1
D. acknowledged: true, matchedCount: 1, modifiedCount: 2

Answer: C

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 # 17
Which of the following is supported by MongoDB?

A. Transaction Management
B. Relationships between Collections (Primary Key Foreign Key)
C. ACID Transactions
D. Journaling

Answer: D

NEW QUESTION # 18
What is the maximum size of Index Key Limit and Number of Indexes per collection?

A. 12 mega bytes and 64 indexes
B. 1024 bytes and unlimited indexes
C. 1024 bytes and 64 indexes
D. 64 bytes and 1024 indexes

Answer: C

NEW QUESTION # 19
......

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