CSQL is an open source main memory high-performance relational database management system developed at sourceforge.net. It is designed to provide high performance for SQL queries and DML statements. As there is no disk I/O, main memory databases provide a predictive response time (~10 microseconds for point lookup and ~20 microseconds for insert/update/delete operations) which is suited to real time and near real time applications. For more information see It can transparently cache data from existing databases.