Need to clean out mysql - id valid/active from invalid/inactive to delete

KMadvisor

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Mar 22, 2020
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Victoria, BC
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Novice here, maybe a simple set of tasks? Hope someone can help.
A support team trying to install Drupal 8 for three sites I run has installed multiple dbases, some named Drpl### others a variation of the website domain name, with 3-8 for each (!) domain. I want to get rid of the erroneous and inactive dbases, but am fearful of destroying the active sites. Then, I can backup to perform upgrades safely.

How can I tell what's active and what's not?
How should I tackle the challenge?

Thx for any advice!
JJ