Administrator
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This is okay, as differences between the primary server(s) and the standby server(s) are always supported as long as the Oracle software installed on all servers is of the same Oracle Platform is certified to run on each server, and is the same Oracle Database Release and Patch Set.
So what you can do is;
Create another standby on that Linux 7.4 (this will be your additional standby)
Once you create the standby and make that standby sync with the primary, cancel the redo flow for the your current standby , which is running on Linux 5.9..
By using this kind of an approach, you will ensure the disaster recovery is always in place..
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