Operation in a redundant system
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In redundant operation two alternatives are available. In the first way the SQL database runs locally on both servers and the Process Gateway also runs on both servers. As only online values are handled no further alignment between the databases is necessary. The big disadvantage of this version is the high network load that is a result from the additional reading of online values on the standby server.
In the second version the Process Gateway only runs on the Runtime server and writes data to a local or a remote SQL database. In this alternative no additional network load between the Runtime and the standby server occurs and in the case of the remote SQL database the server is not strained by external requests to that database.