HowTo: Remove parameters from the spfile

Here's a question that comes up often:

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

Answer:

• 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!