MongoDB C100DBA Exam Sample Questions & Valid C100DBA Guide Files

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The C100DBA certification exam is based on the latest version of MongoDB, version 4.4. It covers a wide range of topics related to database administration, including installation and configuration, performance optimization, security, backup and recovery, and data modeling. C100DBA Exam is designed to test the skills and knowledge of professionals who work with MongoDB databases on a daily basis and are responsible for ensuring that they are running smoothly and efficiently.

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q110-Q115):

NEW QUESTION # 110
'$set' sets the value of

A. None of the above
B. Code block
C. Name/value pair
D. Key

Answer: D

NEW QUESTION # 111
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

Answer:

Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )

NEW QUESTION # 112
What does the following aggregate query perform?

A. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
B. Fetches the posts with likes between 100 and 200 and sets their _id as null
C. Calculates the number of posts with likes between 100 and 200
D. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time

Answer: C

NEW QUESTION # 113
Consider an inventory collection that contains these documents:
{ " _id " : 1, " product " : " x-small box " , " colors " : [ " brown " , " black " , " white " ], " qty " : 50 }
{ " _id " : 2, " product " : " small box " , " colors " : [ " brown " , " white " ], " qty " : 60 }
{ " _id " : 3, " product " : " medium box " , " colors " : [ " black " , " grey " , " white " ], " qty " : 45 }
{ " _id " : 4, " product " : " large box " , " colors " : [ " grey " ], " qty " : 50 }
{ " _id " : 5, " product " : " x-large box " , " colors " : [ " grey " , " white " ], " qty " : 10 } What result set does the following query return?
db.inventory.find({
$or: [
{ " product " : " x-small box " },
{
$and: [
{ " qty " : { $ne: 50 } },
{ " colors " : { $nin: [ " brown " ] } }
]
}
]
})

A. Documents _id:1 and _id:3.
B. Documents _id:1, _id:2, _id:3, and _id:5.
C. Documents _id:1, _id:3, and _id:5.
D. Documents _id:3 and _id:5.

Answer: C

Explanation:
The outer $or returns a document if either branch is true. Document 1 satisfies the first branch because product equals " x-small box " , so it is included regardless of the second branch. The nested $and requires both qty != 50 and the absence of " brown " from the colors array. Document 2 has quantity 60 but contains " brown " , so it fails $nin. Document 3 has quantity 45 and its colors do not include brown, so it satisfies both conditions. Document 4 has no brown but quantity is exactly 50, so it fails $ne: 50. Document 5 has quantity
10 and colors [ ' grey ' , ' white ' ], so it also satisfies both nested predicates. The final set is therefore documents 1, 3, and 5. This question also illustrates that MongoDB applies an implicit AND between multiple top-level field predicates in the same document, but here the explicit $and makes the required conjunction clear. Option D is the only answer containing exactly the matching documents.
Study Guide reference/topic:MongoDB Architecture and Core Operations - logical query operators, $or, $and,
$ne, and $nin.

NEW QUESTION # 114
In which of the following scenarios is sharding not the correct option. Select all that apply.

A. The working set in the collection is expected to grow very large in size
B. The write operations on the collection are very high
C. The write operations on the collection are low
D. The collection is a read intensive collection with less working set

Answer: C,D

NEW QUESTION # 115
......

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