Latest [Oct 24, 2024] C100DBA Exam with Accurate MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) PDF Questions
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NEW QUESTION # 14
Which node in a replica set does accept write operation?
- A. primary
- B. secondary
- C. hidden
- D. arbiter
Answer: A
NEW QUESTION # 15
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
- A. db.c.find( { b : [ 0 , 5 ] > )
- B. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )
- C. db.c.find( { > , { b : [ 0 , 5 ] > )
- D. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
- E. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
Answer: B
NEW QUESTION # 16
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION # 17
Which are the ONLY ways to project portions of an array?
- A. All of the above
- B. $slice
- C. $ elemMatch
- D. $
Answer: A
NEW QUESTION # 18
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
- A. db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})
- B. db.test.ensurelndex( { c:l, a: 1})
- C. db.test.ensurelndex( { a: 1, b :1, c:l, d:l})
- D. CH db.test.ensurelndex( { a :1, c:l})
Answer: A,D
NEW QUESTION # 19
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.$.author":-l});
- B. db.posts.createIndex({comments.author":-l});
- C. db.posts.createIndex({comments.$.author": {$desc:l>});
Answer: B
NEW QUESTION # 20
Mongodb does provide high availability via which option?
- A. Replication
- B. Indexing
- C. Journaling
- D. Sharding
Answer: A
NEW QUESTION # 21
Which of the following operator can be used to control the number of items of an array that a query returns?
- A. $slice
- B. $ elemMatch
- C. MongoDB does not support partial retrieval of items from an array
- D. $
Answer: A
NEW QUESTION # 22
Aggregation Pipelines have a limit of:
- A. 16 MB document and 100 MB RAM
- B. 2 MB document and 100 MB RAM
- C. No limit on document and 100 MB RAM
- D. 2 MB document and no limit on RAM
Answer: A
NEW QUESTION # 23
Consider the following example document:
{
"_id": Objectld("5360c0a0a655a60674680bbe"),
"user"
"login": "irOn"
"description": "Made of steel"
"date": ISODate("2014-04-30T09:16:45.836Z"),
}
>
and index creation command:
db.users.createlndex( { "user.login": 1, "user.date": -1 }, "mylndex" ) When performing the following query:
db.users.find( { "user.login": /Air.*/ },
{ "user":1, "_id":0 > ).sort( { "user.date":1 > )
which of the following statements correctly describe how MongoDB will handle the query? Check all that apply.
- A. MongoDB will need to do a table/collection scan to find matching documents
- B. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field
- C. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login"
- D. None of the above
- E. As an indexed query using "mylndex" because field "user.login" is indexed
Answer: E
NEW QUESTION # 24
What is the first task that a secondary would perform on being prompted by another secondary for an election?
- A. Connect to primary to confirm its availability
- B. Vote for itself and then call for election
- C. Vote for the first secondary so that it would become the next primary
- D. Start the election process for primary
Answer: A
NEW QUESTION # 25
Which of the following aggregation commands in MongoDB does not support sharded collections?
- A. All of the above
- B. group
- C. mapReduce
- D. aggregate
Answer: B
NEW QUESTION # 26
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: null } } )
- B. db.posts.find( { post_timestamp : { $type; 10 > > )
- C. db.posts.find( { post_timestamp: { $fieldtype: null } } )
- D. db.posts.find( { post_timestamp: { $fieldtype: 10 } } )
Answer: A
NEW QUESTION # 27
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
- A. Database and Table
- B. Column and Row
- C. Table and Row
- D. Table and Column
Answer: C
NEW QUESTION # 28
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: E
NEW QUESTION # 29
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( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
- B. db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )
- C. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$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 # 30
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. {update: true, insert: true} as the third parameter of update command
- B. upsert command instead of update command
- C. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
- D. Specify {upsert : true } as the third parameter of update command
Answer: D
NEW QUESTION # 31
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: 1, c: 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} )
Answer: B,C
NEW QUESTION # 32
In which of the following scenarios is sharding not the correct option. Select all that apply.
- A. The write operations on the collection are low
- B. The working set in the collection is expected to grow very large in size
- C. The write operations on the collection are very high
- D. The collection is a read intensive collection with less working set
Answer: A,D
NEW QUESTION # 33
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