Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 126 discussion

The best caching strategy for populating real-time dashboards using Amazon ElastiCache would be a write-through caching strategy. In this strategy, when new data is written to the database, it is also written to the cache. This ensures that the most current data is always available in the cache for the real-time dashboards to access, reducing the latency of the data retrieval. Additionally, using a write-through cache ensures that data consistency is maintained between the database and the cache, as any changes to the data are written to both locations simultaneously.

the keyword => real-time

When using a write-through cache strategy, the cache is updated in real-time alongside the database. This ensures that the cached data remains consistent with the underlying database. According to AWS best practices, this approach pushes data into the cache at the time it is written to the database, reducing the risk of serving stale data. In contrast, option A (a read-through cache strategy) may result in stale data, particularly if the cache has a time-to-live (TTL) setting that allows data to remain in the cache longer than it remains accurate in the database. This can be problematic for real-time dashboards that require up-to-date information. For these reasons, I opted for option D. https://aws.amazon.com/caching/best-practices/#:~:text=Write%2Dthrough,also%20pushed%20into%20the%20cache. Please correct me if my understanding is incorrect, as I am still learning.

D is the correct answer.

B. Write Behind Cache.

D. A write-through cache: A write-through caching strategy immediately writes data to both the cache and the database at the same time. This approach ensures that the cache always contains the most recent data, making it highly suitable for applications that require up-to-date information, such as real-time dashboards.

ChatGPT:C

ans- A Option D, a write-through cache, is incorrect because it would not meet the requirement of populating real-time dashboards. A write-through cache writes data to the cache and the database at the same time. This means that the data in the cache would always be up-to-date, but it would also mean that the cache would always be lagging behind the database. This would cause a delay in populating real-time dashboards.

A write-through cache strategy involves writing data to both the cache and the underlying database simultaneously. When data is updated or inserted into the database, it is also stored or updated in the cache to ensure that the cache remains up-to-date with the latest data.