Redo log buffers contains all changes made to the database. It record both redo changes ans undo chnages. Redo records are used for roll forward and undo records are used for roll back
Redo log buffers consists of change vectors where each vector contains information about which block is changed and where is the change done in the memory. This information will be useful when you are performing recovery and while writing to disk while checkpointing. There is a 1-to-1 correspondence with redo log buffers and data buffer cache buffers.
