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).
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 …Continue reading...