Is it possible that your Oracle9i database is started with a SPFILE instead of a PFILE? If so, then changing your PFILE will not matter as Oracle is reading the SPFILE on startup instead. To find out if a SPFILE is user, do the following in SQL*Plus:
SHOW PARAMETER SPFILE
The returned value will point to the SPFILE. If no value is returned, then a PFILE is being used.
If a SPFILE is being used, then change the COMPATIBLE parameter as follows:
ALTER SYSTEM SET compatible=184.108.40.206 SCOPE=SPFILE;
Then restart the database.
If you are truly using a PFILE, then Oracle may be using a different PFILE than the one your are modifying. Next time, start up the database and explicitly point to your PFILE with the "PFILE=/path/filename" parameter on your STARTUP command.
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