Restore old sap parameters to minimimize down time

Hi Friends,
I want to change some sap instance parameters based on observation thru rz10. Now while restart with the new parameters if SAP shows some error ,
(1) how can I restore old parameters to minimimize down time and start my system again.
(2) What are the necessary precaustions need to be taken before and after the changes.
Thanks & Best Regards,
Atul

1) RZ10 creates a backup on the filesystem. Goto your profile dir (/sapmnt/SID/profile on unix) and put back the the .BAK file, then restart your system.
2) Always document your changes (changelog). Test changes on a test system, before you do it on production. Read the corresponding notes, docu. Sometimes it is useful to manually create a copy of your profiles (especially if you do multiple changes), as the BAK file is overwritten everytime.
Regards, Michael
Edit: and hey, if you do change the profiles on the filesystem, then don't forget to import them in RZ10 again.

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Restore old sap parameters to minimimize down time

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