When upgrading Release 4 Service Registry to Release 5, consider the following aspects of the upgrade process:
General Upgrade Approach. The upgrade is achieved by performing a fresh install of Release 5 Service Registry, migrating the Release 4 data and configuration to Release 5, and then removing Release 4 to conserve disk space.
Upgrade Dependencies. Service Registry has dependencies on a number of Java ES shared components, as listed in Table 1–7. All of these shared components are automatically upgraded to Release 5 by the Java ES installer when you perform an Service Registry upgrade.
In addition, Service Registry has a hard upgrade dependency on Application Server and Java DB.
Backward Compatibility. Release 5 Service Registry is backwardly compatible with Release 4.
Upgrade Rollback. A rollback of the Release 5 upgrade is achieved by reverting to Release 4 after restoring the saved database and configuration data.