kdb+ is a column-based relational time series database (TSDB) with in-memory (IMDB) abilities, developed and marketed by KX.
[1] The database is commonly used in high-frequency trading (HFT) to store, analyze, process, and retrieve large data sets at high speed.
[7] kdb+ is a high-performance column-store database that was designed to process and store large amounts of data.
Created with financial institutions in mind, the database was developed as a central repository to store time series data that supports real-time analysis of billions of records.
[14] New features included Multithreaded primitives, Intel Optane DC persistent memory support and Data at Rest Encryption.