I am seeing increase in my backup time. I am using RMAN backup. If I recycle the database it works fine, but over a period of time the backup time starts increasing.
After restarting the database, backup can be done in 3-4 hours, but after few days it may take 18-20 Hours.

I am on Windows 2000, Oracle 8173, database size is around 200GB.

Any Clues...........