Toshiba 6F8C0791, Manual

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3. Database Management
22
Network Database
The network database resides in the hard disks of the SVR-DS and OIS-DS saved with different
setup information. In the network database, data can be written and read for each item in the table.
The SVR-DS can be accessed from the SVR-DS and OIS-DS.
The network database of the SVR-DS is saved with system setup information common to the
OIS-DS and SVR-DS, such as historical tag setup information and internal tag information. The
SVR-DS contains system data files to save system information and application data files to save
application data. Data is equalized in the network databases of all the SVR-DS units.
OIS-DS
SVR-DS
SVR Database
S erver P rocess,
U ser A pplications
Database Equalization
SVR-DS
SVR Database
Database Equalization
•
•
The operator window is read from any SVR database.
‚
The operator window is written in the SVR databases of all nodes.
ƒ
The server process, user applications, etc. are read from the SVR database
of own node.
„
The server process, user applications, etc. are written in the SVR databases
of all nodes.
…
Missing data while the server is failing is synchronized by starting the
synchronizing process “Database Equalize” when the server is started up.
Operator
Window
‚
ƒ „ „ ‚
…
…
Figure 3.7 Equalization of Network Databases of SVR-DS