The kernel is the central component of the database system. The kernel manages access to the permanently stored data in a database instance and processes the SQL statements; for liveCache database instances, it processes the OMS procedures.
To start a database instance, the kernel of the database system is started for the specific database name. While the database is running, the kernel includes several different operating system threads.
The database system is delivered with several different kernel variants.
Concepts of the Database System,