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Tweaking RDS Database Performance and ElastiCache
Tweaking Database Performance
An RDS database, or a SQL database in general, can only be scaled vertically. To scale a database vertically means to increase the resources of your database but you still have a single database. If the performance of your database becomes insufficient, you must increase the performance of the underlying hardware:
Keep in mind that you can't increase resources without limits. One of the largest RDS database instance types comes with 32 cores and 244 GiB memory. In comparison, an object store like S3 or a NoSQL-database like DynamoDB can be scaled horizontally without limits.
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