ROLLBACK CONTENTION NOTES:
Segment Name - Name of the rollback segment.
Seg# - Rollback segment number.
Gets - Number of header gets.
Waits - Number of header waits.
Hit Ratio - Ratio of gets to waits. This should be >= 99%.
Active Transactions - Number of active transactions.
Writes - Number of bytes written to rollback segment.
Hit Ratio should be >= 99% - if not, consider adding additional rollback segments.
Check the system undo header, system undo block, undo header, undo block statistics under
"Wait Statistics" for additional information on rollback contention.