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Exam AZ-203 topic 5 question 9 discussion

Actual exam question from Microsoft's AZ-203

Question #: 9
Topic #: 5

HOTSPOT -
A company is developing a gaming platform. Users can join teams to play online and see leaderboards that include player statistics. The solution includes an entity named Team.
You plan to implement an Azure Redis Cache instance to improve the efficiency of data operations for entities that rarely change.
You need to invalidate the cache when team data is changed.
How should you complete the code? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Box 1: IDatabase cache = connection.GetDatabase();
Connection refers to a previously configured ConnectionMultiplexer.
Box 2: cache.StringSet("teams",")
To specify the expiration of an item in the cache, use the TimeSpan parameter of StringSet. cache.StringSet("key1", "value1", TimeSpan.FromMinutes(90));
References:
https://azure.microsoft.com/sv-se/blog/lap-around-azure-redis-cache-preview/

by Khang at Jan. 25, 2020, 9:01 a.m.

Comments

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ac3ju

Highly Voted 5 years, 5 months ago

IDatabase.KeyDelete looks better solution https://csharp.hotexamples.com/examples/-/IDatabase/KeyDelete/php-idatabase-keydelete-method-examples.html

upvoted 32 times

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predator

Highly Voted 5 years, 4 months ago

Correct Answer: cache.KeyDelete Scenario: You need to invalidate the cache when team data is changed.

upvoted 16 times

predator

5 years, 4 months ago

Source: https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-web-app-cache-aside-leaderboard

upvoted 13 times

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VK_Gladiator

4 years, 6 months ago

code snippted. void ClearCachedTeams() { IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("teamsList"); cache.KeyDelete("teamsSortedSet"); ViewBag.msg += "Team data removed from cache. "; } Reference link: https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-web-app-cache-aside-leaderboard

upvoted 4 times

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meoukg

Most Recent 3 years, 3 months ago

Got it on 03/2022, I chose as below: 1. IDatabase cache = connection.GetDatabase(); 2. cache.KeyDelete("teams",")

upvoted 1 times

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victor

4 years, 4 months ago

KeyDelete Seems to be more appropriate here.. For invalidating cache you can either use StringSet with expiration time as parameter or simply remove key by removing it using keydelete As question dosen't talk about any expiration time i think most appropriate answer is KeyDelete

upvoted 1 times

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ExamStudent123

4 years, 11 months ago

Exact code sample found on this page: https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-web-app-cache-aside-leaderboard void ClearCachedTeams() { IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("teamsList"); cache.KeyDelete("teamsSortedSet"); ViewBag.msg += "Team data removed from cache. "; }

upvoted 7 times

Juanlu

4 years, 7 months ago

Agree. After check it in a quick sample, StringSet("Key1", ""), cannot pass a null as a second parameter, so could be a solution but no a good one. Finally I can say, the best answer is: åcache.keyDelete

upvoted 2 times

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Ananas

4 years, 11 months ago

As far as I understand, SetKey is useful to set an expiration time, while here we have to invalidate the cache when data changes, so KeyDelete seems to be the right choice. As an example, from microsoft docs: void ClearCachedTeams() { IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("teamsList"); cache.KeyDelete("teamsSortedSet"); ViewBag.msg += "Team data removed from cache. "; }

upvoted 1 times

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niloySubs

4 years, 11 months ago

to invaliate redis cache - you need to delete the key from redis cache. You can Visit this link for the entire program\case study: https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-web-app-cache-aside-leaderboard void ClearCachedTeams() { IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("teamsList"); cache.KeyDelete("teamsSortedSet"); ViewBag.msg += "Team data removed from cache. "; } Correct Answer is : IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("xxxxxxxxx");

upvoted 8 times

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brajen

4 years, 11 months ago

Do not get confuse..given answer is correct only . Here you can just reset the value of the Key to invalidate the data..so need not to delete the key. option cache.StringSet("Teams") is the correct option

upvoted 2 times

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mcampos

5 years ago

Cache.KeyDelete https://docs.microsoft.com/en-us/azure/azure-cache-for-redis/cache-web-app-cache-aside-leaderboard

upvoted 1 times

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heero

5 years, 3 months ago

void ClearCachedTeams() { IDatabase cache = Connection.GetDatabase(); cache.KeyDelete("teamsList"); cache.KeyDelete("teamsSortedSet"); ViewBag.msg += "Team data removed from cache. "; }

upvoted 11 times

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