The parallel upgrade catctl.pl can resume once an upgrade has stopped for unexpected reasons. Before Oracle 12.2 you can restart it with the -p option specifying the phase it stopped. And since Oracle 12.2 you can only use the -R option to resume it. This blog post will give you a bit more insights in monitoring catctl.pl progress during upgrades.
Monitoring catctl.pl progress during upgrades
I blogged about the resume options for catctl.pl a while ago:
But you may ask yourself: How does the tool know where to resume? And do you need …
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