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The 20GB minimum is for the RDS database INSTANCE. You can create as many MySQL databases as you'd like within that instance without allocating more space. I just tried it to verify, and it happily lets me execute as many CREATE DATABASE statements against the single instance as I'd like.
If you do end up needing more than the 20GB you can either manually grow the volume or let RDS autogrow it. But if the databases are small enough you can support quite a few before that is necessary.
Hi HalTemp!
Thanks for your reply. You are 100% right. My misunderstanding was, that I would have to use the RDS Console on the website, where the button "Create Database" actually leads to "Create Database Instance". With the SQL Statement "CREATE DATABASE" it works fine.
Thanks again!
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