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NEW QUESTION # 54
Which of the following is true about sharding?
- A. Creating a sharded key automatically creates an index on the collection using that key
- B. We cannot change a shard key directly/automatically once it is set up
- C. Sharding is enabled at the database level
- D. A sharded environment does not support sorting functionality since the documents lie on various mongod instances
Answer: B
NEW QUESTION # 55
Which type of indexes does MongoDB support?
- A. All of the above
- B. Geospatial Indexes
- C. Multikey Indexes
- D. Compound Indexes
Answer: A
NEW QUESTION # 56
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 but retrieves only the size field from the array
- B. Returns the complete document since MongoDB does not support partial array retrieval
- C. Returns the document but with only one element in the variations array (corresponding to size L)
- D. 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)
Answer: C
NEW QUESTION # 57
Which mongodb tool is used to report details on number of database operations in MongoDB?
- A. mongodump
- B. mongostat
- C. mongorestore
- D. mongotop
Answer: B
NEW QUESTION # 58
Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.
- A. $group
- B. $match
- C. $aggregate
- D. $sum
Answer: B
NEW QUESTION # 59
What tool do you use if you want to extract a CSV from mongo?
Answer:
Explanation:
mongoexport
NEW QUESTION # 60
What is the output of the following program?
- A. 1s
- B. 100 s
- C. 60 s
- D. 100 ms
Answer: C
NEW QUESTION # 61
Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
- A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
- B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u "flipar"}
- C. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u "flipar" }
- D. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }
Answer: A,D
NEW QUESTION # 62
In mongodb how do you update a document partially?
- A. $set
- B. $project
- C. $modify
- D. $update
Answer: A
NEW QUESTION # 63
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
- A. Properly defined user roles
- B. Sharding
- C. Replication
- D. Put indexes on all of your documents
- E. The proper storage engine
Answer: C
NEW QUESTION # 64
Aggregation Pipelines have a limit of:
- A. 2 MB document and 100 MB RAM
- B. 2 MB document and no limit on RAM
- C. No limit on document and 100 MB RAM
- D. 16 MB document and 100 MB RAM
Answer: D
NEW QUESTION # 65
Which format/standard is used by MongoDB internally to store documents?
- A. BSON
- B. JSON - Extended
- C. JSON
- D. B+ Trees
Answer: C
NEW QUESTION # 66
Which of the following are common uses of the mongo shell? Check all that apply
- A. Use as a JavaScript framework for your production system
- B. Perform queries against MongoDB collections
- C. Perform administrative tasks
Answer: B,C
NEW QUESTION # 67
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?
- A. Table and Row
- B. Table and Column
- C. Database and Table
- D. Column and Row
Answer: A
NEW QUESTION # 68
What does the following aggregate query perform?
- A. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
- B. Fetches the posts with likes between 100 and 200 and sets their _id as null
- C. Calculates the number of posts with likes between 100 and 200
- D. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
Answer: C
NEW QUESTION # 69
Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
- A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u
"flipar" } - B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
- C. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" :
v u "flipar" } - D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u
"flipar"}
Answer: B,C
NEW QUESTION # 70
Mongodb does provide high availability via which option?
- A. Sharding
- B. Journaling
- C. Replication
- D. Indexing
Answer: C
NEW QUESTION # 71
The MongoDB explain() method does not support which of the following verbosity mode:
- A. queryPlanner
- B. executionStats
- C. allPlansExecution
- D. customExecutionStats
Answer: B
NEW QUESTION # 72
What is the maximum size of Index Key Limit and Number of Indexes per collection?
- A. 1024 bytes and 64 indexes
- B. 12 mega bytes and 64 indexes
- C. 64 bytes and 1024 indexes
- D. 1024 bytes and unlimited indexes
Answer: A
NEW QUESTION # 73
Below is a sample document of "orders" collection
Answer:
Explanation:
$sort
NEW QUESTION # 74
The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.
- A. $ elemMatch
- B. Updating an array field without knowing its index is not possible.
- C. $
- D. $slice
Answer: C
NEW QUESTION # 75
Which of the following operator can be used to control the number of items of an array that a query returns?
- A. $
- B. $ elemMatch
- C. MongoDB does not support partial retrieval of items from an array
- D. $slice
Answer: D
NEW QUESTION # 76
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MongoDB C100DBA certification exam is designed for database administrators who want to demonstrate their proficiency in managing and deploying MongoDB database systems. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification exam is based on the latest version of MongoDB, version 4.4. It covers a range of topics including database security, data modeling, backup and recovery, performance tuning, and replication.
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