[marcinzm]

>(1) I'd like services like RDS or similar on a pay-as-you-go fashion, rather than based on spun-up servers. I'd like SQL-as-a-service where I pay for actual storage and operations (without dedicated machines).

Seems a somewhat hard problem due to latency constraints and advantages of memory caches. For big data you have AWS Athena and Google Big Query. There's also auto-scaling if you're large enough of either read replicas (AWS Aurora) or the whole thing (Google Spanner).

>and be able to track what I'm paying.

Amazon does provide a nice billing dashboard which updates what you're going to pay throughout the month. Telling you ahead of time what the price will be per month of something would be nice.