Help me to clear my clarification

Hi all,
In one of the oracle videos i have heard that the commit takes no time irrespective of any number of dml performed but rollback time increase with the increase in the number of dml to be roll backed...How far is it true...comments please

964145 wrote:
Hi all,
In one of the oracle videos i have heard that the commit takes no time irrespective of any number of dml performed but rollback time increase with the increase in the number of dml to be roll backed...How far is it true...comments pleaseThis can be understood if you read the documentation: Transactions
Go through and you will understand why commit is faster than rollback.
I just want to extract a couple of points from that page:
Typically, a commit is a fast operation, regardless of the transaction size. The speed of a commit does not increase with the size of the data modified in the transaction. The lengthiest part of the commit is the physical disk I/O performed by LGWR. However, the amount of time spent by LGWR is reduced because it has been incrementally writing the contents of the redo log buffer in the background.
The default behavior is for LGWR to write redo to the online redo log synchronously and for transactions to wait for the buffered redo to be on disk before returning a commit to the user. However, for lower transaction commit latency, application developers can specify that redo be written asynchronously so that transactions need not wait for the redo to be on disk and can return from the COMMIT call immediately.
A rollback of an uncommitted transaction undoes any changes to data that have been performed by SQL statements within the transaction. After a transaction has been rolled back, the effects of the work done in the transaction no longer exist.
The transaction table entry for every active transaction contains a pointer to all the undo data (in reverse order of application) for the transaction. The database reads the data from the undo segment, reverses the operation, and then marks the undo entry as applied. Thus, if a transaction inserts a row, then a rollback deletes it. If a transaction updates a row, then a rollback reverses the update. If a transaction deletes a row, then a rollback reinserts it.
The duration of a rollback is a function of the amount of data modified.Regards.
Al

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