Comment by mattb314

The idea is that memory-only data systems like HyPer are able to make design decisions that make them significantly faster that disk-based systems (eg postgres), even when the working set fits entirely within cache for the disk-based system. Umbra attempts to act like an in-memory DBMS when the working set fits in memory while degrading gracefully as the working set grows beyond memory. Agree the title doesn’t have enough detail to see this though.