Analysis of information sources in references of the Wikipedia article "리두 로그" in Korean language version.
I've referred to two types of redo log file: online and archived.
Standby redo logs (SRL) on the disaster recovery site act as the counterpart to the primary database's online redo logs (ORL) and allow the remote site to receive redo more efficiently.
[...] when a log switch occurs, the contents of the current redo log are written out to an archived redo log by the ARCn process. These logs are also referred to as offline redo logs or simply archive logs.
The current redo log is always online, unlike archived copies of a redo log. Therefore, the online redo log is usually referred to as simply the redo log.
