Performing a Rolling Upgrade

In these days of hard-to-find downtime windows and 24×7 uptime, it's not always easy to perform production WebLogic Server upgrades without adding some risk to the operation of your enterprise applications. If you're using a WebLogic cluster, you can perform many types of minor release upgrades and patching without having to shut down the domain. Even if you aren't using a cluster but are just running multiple Managed Servers in your domain, you can still perform a rolling upgrade of all the servers without first having to shut down the entire domain. Rolling upgrades keep you from having to shut down your domain during an upgrade, by simultaneously allowing you to utilize an upgraded domain in parallel with the domain from the earlier release.