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NEW QUESTION 44
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION 45
Which of the following is true about aggregation framework?
- A. A single aggregation framework operator can be used more than once in a query
- B. the aggregate command operates on a multiple collection
- C. Each aggregation operator need to return atleast one of more documents as a result
- D. Pipeline expressions are stateless except accumulator expressions used with $group operator
Answer: A,C,D
NEW QUESTION 46
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?
- A. upsert command instead of update command
- B. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
- C. {update: true, insert: true} as the third parameter of update command
- D. Specify {upsert : true } as the third parameter of update command
Answer: D
NEW QUESTION 47
What is the maximum size of a MongoDB document
- A. 16 MB
- B. 12 MB
- C. There is no maximum size. It depends on the RAM.
- D. 2 MB
Answer: A
NEW QUESTION 48
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. findOneQ returns the actual first document retrieved from a collection
- C. find.limit(l) is not the same query as findOne()
- D. findQ and findOneQ returns cursors to the collection documents
Answer: D
NEW QUESTION 49
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?
- A. Objec^Array^inData,Symbol, String,MinKey, Null, Numbers
- B. MinKey, Null, Numbers,Object,Array,BinData,Symbol, String
- C. MinKey, Null, Numbers,Symbol, String,Object,Array,BinData
- D. Object/Array^inData/Symbol,MinKey, Null, Numbers,String
Answer: C
NEW QUESTION 50
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: C
NEW QUESTION 51
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
- A. Table and Column
- B. Table and Row
- C. Column and Row
- D. Database and Table
Answer: B
NEW QUESTION 52
Update If Correct is an approach for which of the following concepts in MongoDB:
- A. Performance Management
- B. Atomicity
- C. Concurrency Control
- D. Transaction Management
Answer: C
NEW QUESTION 53
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";-!});
- B. db.posts.createIndex({^comments.$.author":-l});
- C. db. posts.createIndex({^comments.author" :1});
Answer: A
NEW QUESTION 54
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( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
- 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( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )
Answer: D
NEW QUESTION 55
We can insert multiple documents in bulk using which of the following operations:
- A. initializeUnorderedBulk
- B. initializeUnorderedBulkOp
- C. initializeBulkOp
- D. initializeBulk
Answer: B
NEW QUESTION 56
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden.
The set also has an arbiter?
- A. 0
- B. None of the above
- C. 1
- D. 2
Answer: A
NEW QUESTION 57
Which command is used to determine storage capacity of specific database?
- A. constats
- B. mongotop
- C. dbstats
- D. mongostat
Answer: C
NEW QUESTION 58
Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 >
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.
- A. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
- B. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
- D. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
Answer: B,C
NEW QUESTION 59
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: A
NEW QUESTION 60
Which node in a replica set does accept write operation?
- A. primary
- B. hidden
- C. secondary
- D. arbiter
Answer: A
NEW QUESTION 61
Which of the following about Capped Collections is correct?
- A. High-throughput operations that insert and retrieve documents based on insertion order
- B. If the allocated space for a capped collection exceeds, it stops inserting new documents
- C. Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"
- D. Fixed Size
Answer: C
NEW QUESTION 62
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