The redo log buffer is a part of the shared global area (SGA). The redo log buffer is a RAM area that works to save changes to data in case something fails. The redo log buffer is a circular buffer in the SGA that holds information about changes made to the database. This information is stored in redo entries. Redo entries contain the information necessary to reconstruct, or redo, changes made to the database by INSERT, UPDATE, DELETE, CREATE, ALTER, or DROP operations. Redo entries are used for database recovery. More.....