NextGen Archiver (NGA)
Currently WinCC OA provides three different archiving solutions:
ValueArchive (+ RAIMA) and RDB archiving are used to store tag-based events ("value changes") and alarms (alarm instances) based on timestamps to retrieve / query them. Whereas ValueArchive is intended for smaller, stand-alone installations, the RDB Manager is targeted at larger, networked systems.
The NextGenArchive (NGA) for WinCC OA is a new archiving solution which extends flexibility while keeping the possibilities and strengths of the current methods.
The main features of the archiving solution are:
- Archiving events (value changes) and alarms using configuration concepts similar to the already existing WinCC OA archiving solutions
- Compatible historical read interface (dpGetPeriod, dpGetAsynch, dpQuery with TIMERANGE, alert-GetPeriod)
- Direct read option to access underlying DB directly from CTRL code (User Interface, CTRL Manager) without using WinCC OA messaging
- Modular DB backend concept with possibilities for user-specific DB backend interfaces
- Storage of values and alerts*) in multiple DBs / backends possible. See chapters Configuration - Backend and Configuration - Backend Profile
- Modern relational database PostgreSQL® as default backend included in WinCC OA
- Usage of one DB for multiple WinCC OA systems
- DB maintenance (backup, restore etc.) controlled by WinCC OA panels and scripts
- Redundant operations implemented at NGA level and possible for PostgreSQL® and InfluxDB®
Supported Databases
Following databases are currently supported as NGA backends: