kdb is frequently described as an in-memory database, or with great emphasis on how efficiently it utilizes a ton of RAM. I've no idea how much does its perform

kdb is frequently described as an in-memory database, or with great emphasis on how efficiently it utilizes a ton of RAM. I've no idea how much does its performance actually drop when the amount of data goes past, say, 2x the amount of available memory, but I'm pretty sure hardly anyone can afford multiple terabytes of RAM in addition to the software license these days…