C100DBA PDF Pass Leader, C100DBA Latest Real Test [Q27-Q45]

NO.27 Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

NO.28 Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

NO.29 The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:

NO.30 A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

NO.31 You have the following index on the toys collection:
{
“manufacturer” : 1,
“name” : 1,
“date” : -1
}
Which of the following is able to use the index for the query? Check all that apply.

NO.32 What is the maximum size of a MongoDB document

NO.33 We can insert multiple documents in bulk using which of the following operations:

NO.34 When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

NO.35 ‘mongoimport’ command is used for

NO.36 In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)

NO.37 Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.

NO.38 If you have created a compound index on (A,B, C) which of the following access pattern will not be able to utilize the index?

NO.39 JSON stands for

NO.40 In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

NO.41 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^ } } } )

NO.42 Which of the following is correct about MongoDB?

NO.43 Which command is used to determine storage capacity of specific database?

NO.44 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 ] >

NO.45 Which operations add new documents to a collection?