Data guard difference in primary and standby OS.

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Dear All,

We are planning to setup a data guard in our landscape. But my question what are the prerequisites should be consider before getting in to that.

Like my environment -

1. The primary database is running with Red hat Linux 5 - IBM 64 bit and the standby database is Redhat Linux 2.1 IBM 32 bit system.

2. The primary database is running with Red hat Linux 5 - IBM 64 bit with oracle 8.1.7.4 and the standby database is

Linux 2.1 IBM 32 bit system with oracle 10g.

Is the above thing is possible? or we should maintain the same OS / DB combination in the data guard setup.

I am following the below link.

If anyone have thoughts on this please do advice me.

Regards

Vijay