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> we can achieve comparable performance to an in-memory database system for the cached working set

Should I keep reading, or is the title misleading?

The abstract seems to say that the system provides memory-comparable performance for data that is... in-memory

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.

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