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Oracle patches

Hi All,
is it possible to apply the patches in rolling fashion on Primary-Standby (Physical) to avoid database down time? Some of our databases are on 12R2 and some are 19.6 version.
Please share your ideas
Thanks!
0
Answers
Yes, its possible. Please see MOS Note: Oracle Patch Assurance - Data Guard Standby-First Patch Apply (Doc ID 1265700.1)
Thanks Arvind for the response. Some of the patches need to be applied in upgrade mode. To apply in upgrade mode database need to be down. Is there a solution for this? Please let me know.
Thanks