What is "pervasive"

The Pervasive.SQL is a high-performance cross-platform database manager, designed to be used in any type of application, simple or complex.

It is designed to offer features of low memory request and maintenance-free operation, made possible thanks to its self-configurable database with dynamic file management (the more it is used, the more it learns to improve application performance).

Official website: http://www.pervasive.com/