Normally in authomatic start of Oracle Database it search the init.ora in $ORACLE_HOME/database, then you must create a text file with the same name that init_old.ora from older version and write in this init.ora
where $ORACLE_HOME is the path of your old software. And only write this in this init.ora
ifile is a general paramter which can be used to break the parameter files
into sub parts,
For example u can have a standard init.ora parameter file for all instances and
another file containing specific paramters tuned to specific instances.
You can use ifile parameter in your general init.ora parameter file to point to this specific
instance paremer file.
Simillarly you can use ifile paremeter to break tnsnames.ora file into sub parts.
Thank you all for your responses and I apologize for not making myself clear. The question I have is where can I place the IFILE at the new home which will run on 8.1.7
Where is the IFILE suppose to be ??? I understand how to set up to point to the old init.ora but I am not clear how to pit the IFILE at on the new home. Another word, I like to know where in the new Oracle Home I can put the IFILE in???
Thank you very much for all your help and please let me know