All Instances Must Be Ready for Upgrade

If you have multiple instances within a tenancy, all instances must be ready for upgrade before any instances can be upgraded.

Oracle upgrades each instance separately, so you must choose an upgrade window for every instance. You can choose a different upgrade window for each instance.

Upgrade Non-Production Instances First

Oracle recommends upgrading your non-production instances first and your production instances second. Use the time between the upgrades to verify the environment in your non-production instances.

Additionally, if you use an instance for disaster recovery, Oracle recommends upgrading your disaster recovery instance first. Use your own discretion to determine the time between your disaster recovery instance and your production instance.

Keep in mind that during the time period between upgrades, any new features in Oracle Integration 3 aren't available in your Oracle Integration Generation 2 instance.

If You Experience Issues Between Upgrades

If you experience issues in your production instance after your non-production instance has been upgraded, you can't make corrections in the non-production environment, since it has already been upgraded. In such situations, enter a service request (SR) on My Oracle Support so that Oracle can help you plan your next steps.