Scaling Out of the MADOCA Database System for SACLA

The database system in Message and Database Oriented Control Architecture (MADOCA) is required to be highly redundant and stable owing to MADOCA’s reliance upon this system. We have designed and scaled up the database system for MADOCA in SPring-8 Angstrom Compact Free Electron Laser (SACLA) to reduce the server load. It consists of two database servers for operation and one server for relief. The first server for operation, the main server, holds small but frequently accessed data, whereas the second server, the archive server, holds data that is accessed in large blocks. The installation was successfully completed during the summer shutdown of 2012, resulting in a drastically lower central processing unit (CPU) load.