The online redo log is a set of two or more online redo log files that record all changes made to the database, including both uncommitted and committed changes. Redo entries are temporarily stored in redo log buffers of the system global area, and the background process LGWR writes the redo entries sequentially to an online redo log file. See Also: redo log, system global area (SGA), background process, log writer process (LGWR)

The online redo log is a set of two or more files that record all changes made to Oracle datafiles and control files. Whenever a change is made to the database, Oracle generates a redo record in the redo buffer. The LGWR process flushes the contents of the redo buffer into the online redo log. The current online redo log is the one being written to by LGWR. When LGWR gets to the end of the file, it performs a log switch and begins writing to a new log file. If you run the database in ARCHIVELOG mode, then the archiver process or processes copy the redo data into an archived redo log. See Also: archived redo log

The online redo log is a set of two or more files which record all changes made to Oracle data files and control files.