Oracle TimesTen In-Memory Database (TimesTen) is a memory-optimized relational database.
IMDB = In-Memory Database
For existing application with data residing on the Oracle Database, TimesTen is deployed as an in-memory cache database with automatic data synchronization between TimesTen and the Oracle Database.
The application can connect to the IMDB Cache or TimesTen database by direct link and by client/server connections.
The IMDB data Structure resides entirely in main memory at run time. It is maintained in shared memory segments in the operating system and contains all user data, indexes, system catalogs, log buffers, lock tables and temp space.