IPDB vs BigchainDB vs HBASE vs OrbitDB vs MySQL vs MariaDB vs Cassandra vs MongoDB vs PostgreSQL vs Oracle vs Redis vs CockRoachDB

It seems a big title, but I’d like a discussion about decentralized databases solutions

Is there out there a decentralized + high auto scalable + high speed + secure solution

also if someone have some numbers (because when I search I only find “high-speed”) but could do 10, 100, 1000 or 10 000 read+write per seconds ???

To develop decentralized Apps for a multi tools platform (POS, address-book, accounting, inventory, etc)

There is tons of stuff when I search on the web.

Is someone tested some of these?

Terms like noSQL, serverless, nodes, clusters, docker

Right now I’m using MariaDB 10.3 with RocksDB engine (in my view way better than innoDB) but for long term and with growing number of simultaneous users, what could be best?

sometimes load is low, sometimes average, sometimes high, but having to pay a big server to reach the high seems a waist of unused and paid resources…

what I mean by that : pay a server with 16 or 32 gig ram + 500mb or 3Tb… x CPU… but sometimes 100 users, other times 1000 users, you see my point, why pay for 10 000 users all the time?

when I try to search on auto-scaling, pay as you need, it’s really hard, in pricing sections of databases solutions; we have to choose a fix amount or ram, cpu disk pace…

Is there any solution with auto mode (will take more CPU/RAM when needed), take space as needed and be billed only for the use instead of paying for fix amount?

what about peer to peer (like blockchain) solutions ? which is usable and strong for long term ?