[2021] C100DBA PDF Questions - Perfect Prospect To Go With Exam4Docs Practice Exam
MongoDB C100DBA Pdf Questions - Outstanding Practice To your Exam
NEW QUESTION 22
In mongodb how do you update a document partially?
- A. $set
- B. $project
- C. $update
- D. $modify
Answer: A
NEW QUESTION 23
What is the maximum size of a MongoDB document
- A. 2 MB
- B. 16 MB
- C. There is no maximum size. It depends on the RAM.
- D. 12 MB
Answer: B
NEW QUESTION 24
Which of the following is incorrect statement about find and findOne operations in MongoDB?
- A. findQ returns all the documents in a collection while findOne() retrieves only the first one.
- B. findQ and findOneQ returns cursors to the collection documents
- C. find.limit(l) is not the same query as findOne()
- D. findOneQ returns the actual first document retrieved from a collection
Answer: B
NEW QUESTION 25
Which of the following are valid json documents? Select all that apply.
- A. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- B. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
- C. { }
- D. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
Answer: B,C
NEW QUESTION 26
Which of the following aggregation commands in MongoDB does not support sharded collections?
- A. mapReduce
- B. group
- C. All of the above
- D. aggregate
Answer: B
NEW QUESTION 27
Which are the ONLY ways to project portions of an array?
- A. $slice
- B. All of the above
- C. $
- D. $ elemMatch
Answer: B
NEW QUESTION 28
Which of the following command is used to get all the indexes on a collection?
- A. db.collection.getlndexesQ
- B. db.collection.findlndexes()
- C. db.showIndexes()
- D. db.collection.showIndexes()
Answer: A
NEW QUESTION 29
Update If Correct is an approach for which of the following concepts in MongoDB:
- A. Transaction Management
- B. Performance Management
- C. Concurrency Control
- D. Atomicity
Answer: C
NEW QUESTION 30
Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.
- A. Members of a replica set may replicate data from any other data-bearing member of the set by default
- B. Operations on the primary are recorded in a capped collection called the oplog
- C. Clients read from the nearest member of a replica ser by default
Answer: B
NEW QUESTION 31
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?
- A. db.population.aggregate( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )
- B. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $pop: 1 } } }] )
- C. db.population.aggregate( [{ $group: { _id: { state: "$state", city; "$city" },pop: { $sum: 1 > > >] )
- D. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
Answer: A
NEW QUESTION 32
Consider the following document from the products collection:
What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size: ^L^ } } } )
- A. Returns the document but with only one element in the variations array (corresponding to size L)
- B. Returns the complete document but retrieves only the size field from the array
- C. Returns the complete document but retrieves only the size field from the array and also with only one element in the variations array (corresponding to size L)
- D. Returns the complete document since MongoDB does not support partial array retrieval
Answer: A
NEW QUESTION 33
Which of the following commands will return all the posts with number of likes greater than 100 and less than
200, both inclusive?
- A. db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );
- B. db.posts.find({ likes : { $gte : 100, $lt : 200 } } );
- C. db.posts.find({ likes : { $gt : 100, $lt : 200 > > );
- D. db.posts.find({ likes : { $gt : 100 , $lte : 200 } } );
Answer: A
NEW QUESTION 34
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?
- A. A document will be inserted with the same _id as the last document inserted
- B. A document that matches the collection's existing schema, but with null fields
- C. An empty document
- D. A document with an _id assigned to be an Objectld
- E. No document will be inserted; an error will be raised
Answer: D
NEW QUESTION 35
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION 36
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 37
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Online Questions - Outstanding Practice To your C100DBA Exam: https://www.exam4docs.com/C100DBA-study-questions.html
Practice To C100DBA - Exam4Docs Remarkable Practice On your MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Exam: https://drive.google.com/open?id=18P4gUeqb8teevkR1If5buCuGcnU2w6wX
