This is the max you can have and you define it during the shape selection:
I have already updated all the Stacks I propose to support Flex Shapes and of course the Ampere ones:
When you select a Flex Shape you will be invited to also fill the OCPUs and Memory you want to deploy:
Enjoy deploying your application on OCI and for the database, no worry, relax and trust MDS !
If you don’t have yet an OCI account and would to receive $300 credits to use with MySQL Database Service: https://www.oracle.com/cloud/free