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NEW QUESTION # 56
The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:
- A. <database>..oplog.rs
- B. local.oplog.rs
- C. <replicasetid>.oplog.rs
- D. oplog.rs
Answer: B
NEW QUESTION # 57
What is the output of the following program?
- A. 60 s
- B. 1s
- C. 100 ms
- D. 100 s
Answer: A
NEW QUESTION # 58
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 : { $gt : 100 , $lte : 200 } } );
- C. db.posts.find({ likes : { $gte : 100, $lt : 200 } } );
- D. db.posts.find({ likes : { $gt : 100, $lt : 200 > > );
Answer: A
NEW QUESTION # 59
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. 1
- C. None of the above
- D. 2
Answer: A
NEW QUESTION # 60
Which of the following is a valid insert statement in mongodb? Select all valid.
- A. db.test.insert({x:2},{y:"apple"})
- B. db.test.push({x:2,y:"apple"})
- C. db.test.insert({x:2,y:"apple"})
- D. db.test.insert({"x":2, "y":"apple"})
Answer: C,D
NEW QUESTION # 61
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )
- A. Sum of likes on all the posts by an author, grouped by author
- B. Average of likes on all the posts of an author, grouped by author
- C. Number of posts by an author
- D. Sum of likes on all the posts by all the authors
Answer: A
NEW QUESTION # 62
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. As an indexed query using "mylndex" because field "user.login" is indexed
- B. As a covered query using "mylndex" because we are filtering out "_id" and only returning "user.login"
- C. MongoDB will need to do a table/collection scan to find matching documents
- D. None of the above
- E. As an optimized sort query (scanAndOrder = false) using "mylndex" because we are sorting on an indexed field
Answer: A
NEW QUESTION # 63
Consider that our posts collection contains an array field called tags that contains tags that the user enters. {
Which of the following commands will find all the posts that have been tagged as tutorial.
- A. db.posts.find( { tags : "tutorial" } );
- B. db.posts.find( { tags : ["tutorial"] } );
- C. db.posts.findInArray( { tags : "tutorial" > );
- D. db.posts.find( { $array : {tags: "tutorial") > );
Answer: A
NEW QUESTION # 64
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like "%john%"
- A. db.posts.find( { author: /AjohnA/ > )
- B. db.posts.find( { author: /John/ } )
- C. db.posts.find( { $like: {author: /John/} } )
- D. db.posts.find( { author: {$like: /John/} } )
Answer: B
NEW QUESTION # 65
Which of the following needs to be performed prior to initiate backup on a sharded cluster?
- A. db.stopBalancer( )
- B. sh.stopServer( )
- C. db.stopServer( )
- D. sh.stopBalancer( )
Answer: D
NEW QUESTION # 66
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 : { $substr[ 0 , 5 ] > > )
- D. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
- E. db.c.find( { b : [ 0 , 5 ] > )
Answer: B
NEW QUESTION # 67
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
- A. Replication
- B. Put indexes on all of your documents
- C. The proper storage engine
- D. Properly defined user roles
- E. Sharding
Answer: A
NEW QUESTION # 68
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 # 69
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 # 70
Below is a sample document of "orders" collection
Answer:
Explanation:
$sort
NEW QUESTION # 71
When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?
- A. When the many is very large
- B. Never
- C. When the many is not very large
- D. Always
Answer: C
NEW QUESTION # 72
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 complete document since MongoDB does not support partial array retrieval
- B. 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)
- C. Returns the complete document but retrieves only the size field from the array
- D. Returns the document but with only one element in the variations array (corresponding to size L)
Answer: D
NEW QUESTION # 73
Which of the following is a valid insert statement in mongodb? Select all valid.
- A. db.test.insert({x:2},{y:"apple"})
- B. db.test.push({x:2,y:"apple"})
- C. db.test.insert({x:2,y:"apple"})
- D. db.test.insert{"x":2, "y":"apple"})
Answer: C,D
NEW QUESTION # 74
In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 75
The difference between $push and $addToSet is:
- A. $addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not
- B. $addToSet adds the item to the field only if the new item is of the same datatype
- C. There is no major difference between them. $addToSet is a deprecated version of $push.
- D. $addToSet needs the fields to be already present while $push will work even if the field is not present
Answer: A
NEW QUESTION # 76
Which operations add new documents to a collection?
- A. update
- B. Create
- C. delete
- D. insert
Answer: B,D
NEW QUESTION # 77
Consider the following example document from the sample collection. All documents in this collection have the same schema.
Which of the following queries will replace this with the document.
- A. db.sample.update( { "_id" : 3 } , { "_id" : 7 , "c" : 4 } )
- B. db.sample.update( { "_id" : 3 } , { "_id" : 7 , "c" : 4 , { "$unset" : [ "a" , "b" ] } } )
- C. db.sample.update( { "_id" : 3 } , { "$set" : { "_id" : 7 , "c" : 4 } } )
- D. db.sample.update( { "_id" : 3 } , { "_id" : 7 , "c" : 4 } , { "justOne" : true } ) // This operation cannot be done with a single query.
Answer: B
NEW QUESTION # 78
What tool do you use to see if you have a problem in the consumption of disk I / 0?
Answer:
Explanation:
Mongoperf
NEW QUESTION # 79
Which of the following does MongoDB use to provide High Availability and fault tolerance?
- A. Replication
- B. Indexing
- C. Write Concern
- D. Sharding
Answer: A
NEW QUESTION # 80
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C100DBA exam questions for practice in 2024 Updated 130 Questions: https://www.trainingquiz.com/C100DBA-practice-quiz.html
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