are there any nice rules of thumb about capacity planning in relation the expected amount of transactions or request per second?
For example, if I have around 100 000 transactions per second on a 5 TB database. With what amount of Memory and CPUs/Cores and which settings would you basically Start to evaluate the performance.
You have to know the duration of a typical query - if it is 1ms, then one cpu can do 1000 tps and you need 100 cpu. If duration is 10 ms, then you need 1000 cpu.
as minimum RAM for OLTP is 10% of database size, in your case 500GB RAM.
Any time, when I see a request higher than 20-30K tps, then it is good to think about horizontal scaling or about sharding.
Regards
Pavel
Or are there any other recommendations or experiences here?
