[2024-Feb-New]Braindump2go Professional-Cloud-Developer PDF Dumps(102-268)

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QUESTION 199
You are designing a chat room application that will host multiple rooms and retain the message history for each room.
You have selected Firestore as your database. How should you represent the data in Firestore?
A. Create a collection for the rooms. For each room, create a document that lists the contents of the
messages
B. Create a collection for the rooms. For each room, create a collection that contains a document for
each message
C. Create a collection for the rooms. For each room, create a document that contains a collection for
documents, each of which contains a message.
D. Create a collection for the rooms, and create a document for each room. Create a separate
collection for messages, with one document per message. Each room's document contains a list
of references to the messages.
Answer: C
Explanation:
The best way to store messages in this scenario is by using subcollections. A subcollection is a collection associated
with a specific document.
https://firebase.google.com/docs/firestore/data-model#subcollections
QUESTION 200
You are developing an application that will handle requests from end users. You need to secure a Cloud Function
called by the application to allow authorized end users to authenticate to the function via the application while restricting
access to unauthorized users. You will integrate Google Sign-In as part of the solution and want to follow Googlerecommended
best practices. What should you do?
A. Deploy from a source code repository and grant users the roles/cloudfunctions.viewer role.
B. Deploy from a source code repository and grant users the roles/cloudfunctions.invoker role
C. Deploy from your local machine using gcloud and grant users the roles/cloudfunctions.admin role
D. Deploy from your local machine using gcloud and grant users the roles/cloudfunctions.developer
role
Answer: B
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