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Topic starter
Hello,
I put here a confirmation from Dominique because I don't know this limitation.
With a single active server in historical association, the passive server cannot read archives from active server. The passive server always reads its archives. SCADA BASIC instructions (availability rate) have no effect on the passive server.
Posted : 09/03/2021 3:51 pm
Hi Anthony,
We experienced this thing with multiple active servers in historical association if you remember Kotaddu’s project. It was surprising but here what you say is even more surprising because it concern single active server architecture!
Are you sure it is about single active association?
In that case their is only one database and the help explains that client request are redirected to the active server. Nothing is explained regarding the Available rate. So passive server should request the active server and even if it is not the case it should request the same database because their is only one.
This available rate is only mentioned in the help for the multiple active servers association and in that case I remember that the passive server is always requesting its own archives, whatever the available rate setting.
Posted : 09/03/2021 9:23 pm
Topic starter
You are right.
I forget to mention that I have two databases. One on the first server with SQL Standard and one on the second server with SQL Express. Two differents HDSconf.dat files.
It is that why the customer uses single active server, not to fill the SQL Express database.
Posted : 09/03/2021 9:43 pm
OK Anthony, in your case it is working.
But what about the case described by Ludo? If there is only 1 db, how the passive server get the data? Directly by requesting the db and NOT through the active server? If yes, that's quite weird actually!!
Nico
Posted : 10/03/2021 1:24 am
Hello,
As far as I know, the stations in an association, whether passive or active, each make their own queries to the database
Posted : 12/03/2021 10:26 pm