Check the target combination
Record your current Tools and Applications releases, environments, operating systems, databases and server components. Check the target against Oracle Certifications (Minimum Technical Requirements), including Java/JDK and WebLogic where applicable. Review required ESUs, customizations and integration dependencies.
Rehearse in nonproduction
Check whether your test environment represents the production web tier and has access to the integrations you need to validate. Where suitable, rehearse the switch to a parallel WebLogic domain. Check sign-in, package deployment, batch jobs and critical connections. Have users validate business transactions and time the restore before the production window.
Agree when to proceed or roll back
Carry out the agreed sequence in the approved production window. Use checkpoints and production smoke tests to guide the go/no-go decision. Name the approver and agree on the latest safe time to start rollback before the window opens.
Hand over the runbook
Record what changed, what passed validation and what still needs attention. Hand over operating and recovery steps, open issues and their owners. If hypercare is in scope, agree on its coverage and who takes over when it ends.