Rolling Patch Upgrade Using RAC

Supported on single patches that are marked as “rolling upgrade compatible” . You can determine if the patch is flagged as rolling upgradeable by checking

patch#/etc/config/inventory file see

online_rac_installable>true
Consider a RAC with 4 nodes
Stop the instance on node1
apply the patch
Restart node
Stress node in order to see patch’s impact
Start instance
do the same for each node , until you apply the patch in all nodes