ORA Database Error Messages ORA-15021: parameter “string” is not valid in string instance September 9, 2015 mpbod ORA-15021: parameter "string" is not valid in string instance Cause: The specified parameter was not supported when starting an instance of this type. Action: Delete the specified parameter from the INIT.ORA file. Back to previous menu Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)