HowTo: Remove parameters from the spfile

* How do you remove an SPFILE parameter (not change the value of, but actually purge it outright)?

* Use “ALTER SYSTEM RESET …” (For database versions 9i and up)

Syntax:

* ALTER SYSTEM RESET PARAMETER SID=’SID|*’
* ALTER SYSTEM RESET “_TRACE_FILES_PUBLIC” SCOPE=SPFILE SID=’*’;

NOTE: The “SID=’SID|*'” argument is REQUIRED!