This patch is Data Guard Standby-First Installable.
Ensure that 19 Release 19.12.0.0.210720DBRU Patch Set Update (PSU) 32904851 is already applied on the Oracle Database.
(Only for Offline Patching) Ensure that you shut down all the services running from the Oracle home.
For a RAC environment, shut down all the services (database, ASM, listeners, nodeapps, and CRS daemons) running from the Oracle home of the node you want to patch. After you patch this node, start the services on this node. Repeat this process for each of the other nodes of the Oracle RAC system. OPatch is used on only one node at a time.
please use -local option to apply the patch to the particular node. e.g., opatch apply -local