I'm fascinated by databases and I'm writing about them. I've collected so much but more input could help to see where I could put more energy.
1) Which database do you use in production? and, why did you choose it?
2) Is it self-managed or managed?
3) What is your biggest complain about it?
4) Which database do you choose if you could migrate at no cost and time?
5) How do you plan for scale? How your cluster looks like? Is your database distributed? How do you handle auto-scaling/sharding/replication/service-discovery?
6) Do you know about your current monthly cost for this database?