C100DBA熱門考題 & C100DBA考試證照綜述

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MongoDB C100DBA Exam Overview:

Certification Vendor:	MongoDB
Exam Name:	MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)
Exam Number:	C100DBA
Exam Duration:	120 minutes
Related Certifications:	MongoDB Certified DBA Professional MongoDB Certified Developer Associate
Available Languages:	English
Exam Format:	Multiple Choice, Scenario-based, Multiple Select
Certificate Validity Period:	3 years
Recommended Training:	MongoDB University Learning Platform
Exam Registration:	MongoDB Certification Portal
Sample Questions:	MongoDB C100DBA Sample Questions
Exam Way:	Online proctored exam
Pre Condition:	Recommended practical experience administering MongoDB deployments (approximately 6+ months) and familiarity with MongoDB 4.4 features.
Official Syllabus URL:	https://www.mongodb.com/certification

>> C100DBA熱門考題 <<

C100DBA：最新的MongoDB C100DBA認證熱門考題，提供全真C100DBA考試證照綜述

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最新的 MongoDB Certified DBA Associate C100DBA 免費考試真題 (Q59-Q64):

問題 #59
What is the use of mongodump and mongorestore tools?

A. backup mongodb deployment
B. replicate mongodb deployments
C. performance tune mongodb deployment
D. audit mongodb deployment

答案：A

問題 #60
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.

答案：C

解題說明：
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.

問題 #61
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

A. group
B. mapReduce
C. All of the above
D. aggregate

答案：D

問題 #62
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({comments.author":-l});
B. db.posts.createIndex({commerits.$.author":-l});
C. db.posts.createIndex({comments.$.author": {$desc:l>});

答案：A

問題 #63
Which mongodb tool is used to report details on number of database operations in MongoDB?

A. mongotop
B. mongorestore
C. mongostat
D. mongodump

答案：C

問題 #64
......

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