I have seen many production environments, however never seen any organisation prefer and use the oracle weblogic upgrade installer for upgrading thier domains.
Confused as to why, I started collecting the answers.
i) As we know the upgrade installer overwrites the APIs (Jar Files) and the scripts, what would happen if the installer for some reason terminates / exits before completing the task.
This may be due to power failure, operating system reboot or corrupt installer or virus / spyware.
This will leave half of the API's and scripts overridden with the later version and half with the older version.
ii) There is no rollback as the file once overridden cannot be recreated.
iii) Also the custom changes made in the scripts may be overridden.
iv) The installer as it executes its task, needs the servers to be down. If the installer takes a long while to complete, then the server availability will be hampered for a substantial amount of time.
v) Roll back i.e. moving back to the older version is not an option, which we can achieve if we use the other methods of upgrading I discussed in my blog.
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