Trying to create a new field returns "General Error: 1030 Got error 1 from storage engine" I recently updated the site to 3.5.5, so not sure if this has anything to do with it. It's been a while since the last field we created, so can not say for sure if this is correlated. Database on this site is fairly large, but my host dashboard shows no issue with DB memory or storage.
I restarted my DB server and it fixed the issue. Sorry for the false alarm, but I've never seen something like that before. Should have tried the DB restart before.