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.
en.wikipedia.org
内存数据库:
内存数据库是指一种将全部内容存放在内存中，而非传统数据库那样存放在外部存储器中的数据库。
zh.wikipedia.org
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In-memory database内存数据库