Check the size of your rollback segments and consider setting optimal sizes for them. It's not really a problem if yours is an OLTP system but you might run into problems if you start running large batch processes as you might find that an individual rollback segment cannot extend because of the wasted space in the tablespace.
HTH
Jim
Oracle Certified Professional "Build your reputation by helping other people build theirs."
"Sarcasm may be the lowest form of wit but its still funny"
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