in-memory

A technical blog post from Data Intellect argues that real-time databases (rdbs) should not be the default in kdb+ systems, presenting benchmarks comparing in-memory and on-disk query performance.

Flatiron is a pure Clojure columnar analytics library for in-memory tables with a SQL-like DSL, designed for performance with primitive arrays and batch processing.

This paper describes Gorilla, an in-memory time series database developed at Facebook that achieves high performance through a novel compression algorithm, enabling storage of billions of time series and fast querying for production monitoring.