In Memory Database

Source: Wikipedia -- https://en.wikipedia.org/wiki/In-memory_database

An in-memory database (IMDB; also main memory database system or MMDB or memory resident database) is a database management system that primarily relies on main memory for computer data storage. It is contrasted with database management systems that employ a disk storage mechanism. Main memory databases are faster than disk-optimized databases since the internal optimization algorithms are simpler and execute fewer CPU instructions. Accessing data in memory eliminates seek time when querying the data, which provides faster and more predictable performance than disk.^[1][2]

Applications where response time is critical, such as those running telecommunications network equipment and mobile advertising networks, often use main-memory databases.^[3][4] IMDBs have gained a lot of traction,^[3] especially in the data analytics space, starting in the mid-2000s - mainly due to cheaper RAM.^[5][6]

With the introduction of non-volatile random access memory technology,^[when?] in-memory databases will be able to run at full speed and maintain data in the event of power failure.^[3][7][8][9]