HDB/RAIMA - RDB Parallel

WinCC OA uses following methods to archive values and alerts:

• HDB (= History Database, used to save value changes)

• RAIMA (Alert database, used to save alerts)

• RDB (= Relational Database, used to save value changes as well as alerts)

These methods can be used at the same time, so that it is possible to save project values at the HDB/Raima and also in the RDB at the same time. For more information see chapter HDB/RAIMA - RDB Parallel, Basics.