I have a following scenario where I had a patched oracle 11gR2 DB (applied Windows Bundle and OJVM patches) and then it was upgrade to Oracle 12cR2. 12cR2 was a clean installation (no patches applied, just a download).
In the case above then do I need to apply “same” patches again to my upgrade 12cR2 DB?
I am talking about patchset bundles. I did apply to 11gR2 a Windows Bundle patches and OJVM PSU.
So just to be clear: To have a "same" level of patching then I need to install corresponding 12cR2 patch? For example I had a 2018 jul patch installed to 11c and now I would need to install "again" 2018 jul, but for 12c (I would install again Windows BP and OJVM PSU)? I understand that 11c patch might have fixed a bug, which is in 11c and 12c, but it does not fix a bug in 12c. As I was saying then I need to be sure..
For the future then I should apply patches before I would do the upgrade?