Important Update (Aug 17, 2019):
This option does not exist since Oracle 18c anymore due to bug 26762080. Instead you could try to use dbua -initParam (just be aware that you can’t pass on an event with this option).
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The Database Upgrade Assistant (DBUA) is the graphical tool to upgrade Oracle databases. And the DBUA removes underscore parameters by default from the SPFILE when upgrading a database. If you don’t want this, there’s a way to tell it how DBUA can ignore underscores with “keepHiddenParams”.
DBUA can ignore underscores with “keepHiddenParams”
The DBUA by default will remove all …
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