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Redo Log Buffer


Notes:

"Redo" is data captured during an update to the database. It can be used to reapply changes to the database in the event of a failure, for example the loss of a disk device. Redo is kept in online and archived redo log files.
The redo log buffer is a staging area for the redo log files. The buffer is written to disk when a commit is executed, when the redo buffer starts to fill and when a checkpoint operation is initiated.