>> Could any one let me know the relationship between redo_log buffer_cache and rollback segment
- redo logs are used to roll-forward
- rollback segments (undo logs) are used in a roll back recovery
- the buffer cache stored incoming data blocks from disk
Oracle writes data only after it ensures that data can be rolled-back.
This may help: http://www.dba-oracle.com/concepts/t_undo.htm