Exam AZ-204 topic 5 question 21 discussion

This is correct! https://docs.microsoft.com/en-us/azure/architecture/best-practices/caching If you look for the right words (related > set | high-performance > channel | recent > list) in documentation, it helps you validate this answer. Ignore the other comments as it only leads to confusion.

This was on the exam (July 2023). Went with proposed. Scored 917

Create a data structure for storing collections of related items: Use a set. Sets in Redis are an unordered collection of unique strings, which makes them suitable for storing collections of related items1. Create a data structure for the most recently accessed cache items: Use a list. Lists in Redis are ordered collections of strings, which can be used to implement a Least Recently Used (LRU) cache by pushing and popping items from the list2.

Here are the appropriate features for each requirement: Create a data structure for storing collections of related items: Set A set in Redis is an unordered collection of unique items. It is suitable for storing collections of related items. Create a data structure for the most recently accessed cache items: List A list in Redis is an ordered collection of items. It can be used to store the most recently accessed cache items, as you can easily add new items to the front of the list and remove the least recently accessed items from the end of the list. Send messages through high-performance publisher/subscriber mechanism: Channel A channel in Redis is used for the publish/subscribe messaging pattern. It allows you to send messages through a high-performance publisher/subscriber mechanism.

represents a collection of unique items, where each item can only appear once in the set. While a set can be used to store a collection of related items, it may not be the most suitable data structure for this requirement. This is because a set does not maintain the order of the items and does not provide an efficient way to search for a specific item.

Here are the features that match the given requirements: Feature: horizontal partitioning Requirement: Create a data structure for storing collections of related items Feature: list Requirement: Create a data structure for the most recently accessed cache items Feature: channel Requirement: Send messages through a high-performance publisher/subscriber mechanism

Set: for related items https://learn.microsoft.com/en-us/azure/architecture/best-practices/caching#use-tags-to-cross-correlate-cached-items List: to find the most recently accessed items https://learn.microsoft.com/en-us/azure/architecture/best-practices/caching#find-recently-accessed-items

Got it in exam 20/10/2022

https://redis.io/docs/data-types/sets/

Correct https://docs.microsoft.com/en-us/azure/architecture/best-practices/caching

caching (in Korean) https://docs.microsoft.com/ko-kr/azure/architecture/best-practices/caching