If I upgrade to 10g db, will it work with 9ias ifra & mid-tier?
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If I upgrade to 10g db, will it work with 9ias ifra & mid-tier?
If you are talking about the transactional database and not the Oracle9iAS infrastructure database, then yes it will work. But test it before doing...
All you need to do is create a seperate database and upgrade it and just change the connection details of infra and application server tnsnames.ora file. Test your existing application and then do the upgrade.
HTH