Definitions for "Redo log"
The file that stores the changes made to a disk in undoable or nonpersistent mode. You can permanently apply the changes saved in the redo log to a disk in undoable mode so they become part of the main disk files. For a disk in nonpersistent mode, however, the redo-log file is deleted when you power off or reset the virtual machine without writing any changes to the disk.
a set of operating system files, external to the database files, that records all changes made to the database, regardless of whether those changes are committed or rolled back
A redo log can be either an online redo log or an archived redo log. The online redo log is a set of two or more redo log groups that records all changes made to Oracle datafiles and control files. An archived redo log is a copy of an online redo log that has been written to an offline destination. See Also: archived redo log, online redo log
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(Recovery Manager User's Guide and Reference; search in this book) [definition #2] (SQL*Plus User's Guide and Reference; search in this book)