Cache Engine Versions

5 minutes 5 Questions

Cache Engine Versions represent the specific versions of the Redis or Memcached cache engines supported by Amazon ElastiCache. Different cache engine versions may have different features, bug fixes, or performance improvements. Amazon ElastiCache regularly updates and expands the supported cache engine versions, allowing you to choose the version that best meets your application requirements. By selecting the appropriate cache engine version for your cluster, you can leverage the latest features, performance enhancements, and security updates provided by the cache engine developers.

Guide: Understanding Cache Engine Versions in Amazon ElastiCache

What it is:
The Cache Engine Versions refers to the different versions available for caching engines that Amazon ElastiCache supports. Two main engines supported are Redis and Memcached. Each version has unique features, performance enhancements and bug fixes.

Why it is Important:
Understanding Cache Engine Versions is crucial as it helps to identify which version is suitable for specific needs. Upgrading to a newer engine version might offer performance enhancements and additional features, but might also include changes that are not backward compatible.

How it Works:
To upgrade the version of your cache engine, you will modify the cache cluster and choose a better version. Note that some upgrades can cause downtime.

Exam Tips: Answering Questions on Cache Engine Versions:
1. Understand the differences between major cache engine versions.
2. Be aware of the process and the implications of upgrading to a newer cache engine version.
3. Know that Amazon ElastiCache supports both Redis and Memcached and the specific use cases for each.
4. Remember that the choice of engine and version can affect performance, feature availability, and compatibility.
5. Note that, while upgrades can bring benefits, they may also introduce changes that could break existing functionality.

Test mode:

Exam (Timed)

Practice (With explanations)

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Question 1

You observed a performance degradation in cache performance. Which cache engine version change should be preferred?

Downgrade to an older version Upgrade to a more recent version Maintain same version and restart Upgrade to an experimental version

Correct Answer: Upgrade to a more recent version

Upgrading to a more recent version usually offers performance improvements and bug fixes that can resolve performance degradation issues. Downgrading, maintaining the version, or switching to a different cache engine will most likely not resolve the issue.

Question 2

You are tasked with setting up a cache cluster using an earlier version of the Redis engine to test a legacy application. What is the recommended approach?

Create a custom parameter group and launch a new cluster using the needed Redis engine version Clone an existing cluster and modify it Contact AWS Support for activating legacy versions Launch the cluster with the current version and downgrade later

Correct Answer: Create a custom parameter group and launch a new cluster using the needed Redis engine version

Creating a custom parameter group with the desired Redis engine version and then launching the cluster is the recommended approach. Other options may cause unnecessary complexity or potential downtime in another live environment.

Question 3

After upgrading to a more recent version of ElastiCache for Redis engine, you noticed increased latency. What might be the reason?

Network restriction because of security updates New version has a different performance profile Incompatible configurations with the new version The upgrade process introduced a delay

Correct Answer: New version has a different performance profile

A new version might have a different performance profile, leading to increased latency. The other responses are possible but less likely explanations. Incompatible configurations would likely result in an error, rather than latency, and the upgrade process itself is separate from the observed latency.

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