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I understand your concern regarding the RDS Reserved Instance you recently acquired. Let me address your situation and provide some insights.
First, it's important to note that Amazon RDS for MySQL 5.7 is reaching the end of its standard support on February 29, 2024. After this date, instances running MySQL 5.7 will be automatically enrolled in Extended Support, which does indeed come with additional costs.
Regarding your specific situation with the t3.small Reserved Instance for Aurora MySQL, it appears that the latest versions of Aurora MySQL may no longer support the t3.small instance class. This is likely due to performance considerations for newer versions of the database engine.
As for your options:
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If you absolutely need to use a t3.small instance, you might consider using RDS for MySQL instead of Aurora MySQL. RDS for MySQL still supports t3.small instances in more recent versions.
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If you decide to upgrade to a t3.medium instance, your t3.small Reserved Instance can still provide some benefit. Amazon RDS offers size-flexible Reserved Instances, which means your t3.small reservation can be applied to a t3.medium instance, albeit only covering a portion of its cost. The discount will be applied based on the relative size difference between t3.small and t3.medium.
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If neither of these options work for your use case, you may want to contact AWS Support to discuss your situation. They might be able to offer more specific guidance or potentially assist with exchanging your Reserved Instance if it's very new.
Remember, the goal of Reserved Instances is to optimize costs based on expected usage. If your needs have changed since purchasing the Reserved Instance, it might be worth reassessing your requirements and potentially adjusting your reservation strategy.
Lastly, keep in mind that while upgrading to a newer version might seem costly in the short term, it often provides benefits in terms of performance, security, and access to new features that could be valuable for your applications in the long run.
Sources
[Announcement] Amazon RDS Extended Support opt-in behavior is changing. Upgrade your Amazon RDS for MySQL 5.7 database instances before February 29, 2024 to avoid potential increase in charges. | AWS re:Post
AWS Services that support reserved nodes size flexibility or reserved instances size flexibility | AWS re:Post
Reserved DB instances for Amazon RDS - Amazon Relational Database Service
What you can also do is purchase another t3.small which when combined with the other t3.small will make the equivalent of a t3.medium
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