DBWn and LGWR work before commit

" - Oracle has generated redo log entries in the redo log buffer of the SGA. The redo log record contains the change to the data block and the change to the rollback
block. These changes may go to disk before a transaction is committed.
- The changes have been made to the database buffers of the SGA. These changes may go to disk before a transaction is committed."
(c) Concepts 10g R.2
When this situation (write dirty blocks and redo entries befor commit) occurs? It is importantly for me to refer on official documentation, when this situations occurs.
Thanks,
Best Regards

915968 wrote:
" - Oracle has generated redo log entries in the redo log buffer of the SGA. The redo log record contains the change to the data block and the change to the rollback
block. These changes may go to disk before a transaction is committed.
- The changes have been made to the database buffers of the SGA. These changes may go to disk before a transaction is committed."
(c) Concepts 10g R.2
When this situation (write dirty blocks and redo entries befor commit) occurs? It is importantly for me to refer on official documentation, when this situations occurs.
no

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DBWn and LGWR work before commit

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