Uncommit change and redo record ?

SQL> update t set a = 1 where b = 2; ----> must have redo record
2 rows updated.
SQL> rollback;the above redo record that uncommit changed must be written from redo buffer to the online redo logfile.
Question:
why Oracle write the redo record that uncommit changed to the online redo logfile ? when it will be used ?
Thanks advance.

Lonion wrote:
I know this . but when it(the redo record that uncommit change) can be used ? rollforward ? rollback ? Maybe it's rollforward ,look at the following:It;s for roll forward only . For roll backward oracle would ask for the images stored in the Undo Blocks.
From Here : http://docs.oracle.com/cd/B10500_01/server.920/a96533/instreco.htm#442821
Cache Recovery (Rolling Forward)
During the cache recovery step, Oracle 【applies all committed and uncommitted changes in the redo log files】 to the affected data blocks. The work required for cache recovery processing is proportional to the rate of change to the database (update transactions each second) and the time between checkpoints.
Transaction Recovery (Rolling Back)
To make the database consistent, the changes that were not committed at the time of the crash must be undone (in other words, rolled back). During the transaction recovery step, Oracle applies the rollback segments to undo the uncommitted changes. The work required to do transaction recovery is proportional to the number and size of uncommitted transactions when the system fault occurred.
From "Cache Recovery (Rolling Forward)" =>【applies all committed and uncommitted changes in the redo log files】
Question: why Rolling Forward applies uncommitted changes ?Actually, Roll Forward doesn't care about that at all. The reason for doing the roll forward is to bridge the gap that exists between the data files and the control files because either there was an instance crash or there is a datafile restored from the backup . The roll forward would apply all the data for the missing transactions . The next step, roll backward , would start rolling back the transactions for which there is no Commit found in the transcation table , found in the Undo segment, pointer of which is going to be kept in the block itself. So once the roll forward and roll backward are complete, Oracle ensures that only the consistent data is ther ein the datafile (means which is committed) since roll forward makes the inconsistent data also come into the data file.
HTH
Aman....

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