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Hello Robert,
Thanks for the feedback.
The questions want you to choose “which of the following are the cost-effective”.
“Implement sharding to distribute the incoming load to multiple RDS MySQL instances.”
– Yes, this option increases read-performance as well as write performance too. You will have to set up multiple databases for sharding, so it would add complexity and not cost-effective, just to increase your read performance. You don’t want to pay for something you will not use.
Regards,
Kenneth Samonte @ Tutorials Dojo
