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in standby you apply only db psu, and primary you should apply both, yes you are correct.
Apply the GI PSU independently. It's a different set of software from a different Oracle Home so you can either do it before hand or afterwards or even at the same time if you want to. But of course the standby will be down temporarily while you do the GI patch (as it will stop the clusterware and ASM). So patch GI independently whenever you like.1 person found this helpful
Then for the DB PSU apply the software to both the primary and the target (OPatch Apply). But the catalog script changes (catbundle.sql psu apply) to the primary only - those changes will propagate through data guard to the standby. If you have MOS access there's a note on this there.