| Feature | Rolling Mode (Default) | Non-Rolling Mode ( -nonrolling ) | |--------|----------------------|----------------------------------| | | One node at a time | All nodes simultaneously | | Downtime | Per-node brief downtime | Full cluster downtime | | Speed | Slower overall completion | Faster total completion | | Risk Profile | Lower (service remains up) | Higher (full outage) | | Use Case | Production RAC clusters | Development, DR, or planned maintenance windows |
| Pitfall | High‑Quality Solution | |--------|------------------------| | Patch fails due to missing prerequisites | Read the README thoroughly. Use opatch prereq CheckApplicable . | | SSH key expired between nodes | Run ssh node2 date as grid user before starting. | | Insufficient memory in OPatch | Increase JAVA_OPTIONS or use ‑J‑Xmx1024m flag. | | Partial inventory corruption | Back up $ORACLE_HOME/inventory before execution. | | Patch applies but cluster won’t start | Re‑run opatchauto to fix configurations, then review logs. | opatchauto72030 execute in nonrolling mode high quality