Archiving
An archive is a database snapshot used for media recovery.
- Load the archive and redo the log
To take an archive snapshot
- write a start-archive record to the log
- copy the DB to an archive medium
- write an end-archive record to the log (or simply mark the archive as complete)
So, the end-archive record says that all updates before the start-archive record are in the archive
Can use the standard LSN-based Restart algorithm to recover an archive copy relative to the log.