kdb+

kdb+ is a time-series database from KX that uses the q vector language and combines in-memory and historical data. It is used in trading and real-time analytics, and it is also categorised as an analytical or warehouse product. The software is proprietary. It is commercially licensed, and a free personal edition is also available. Commercial pricing is not published, so buyers need to contact the vendor for a quotation. It can be run self-managed, and whether a cloud offering exists has not been verified. The product page does not state a latest version or release date, so none is listed here. Buyers should note that the q language is specific to this product and differs from SQL, so teams should consider the cost of training and of hiring people who know it before adopting it, and should confirm the terms of the commercial licence and the limits of the personal edition with KX before using either in production. kdb+ suits organisations handling large volumes of time-stamped market or event data that need to analyse live and historical records together, and that are prepared to buy a proprietary product from a single vendor rather than choose an open-source alternative.