April 2010
Intermediate to advanced
348 pages
8h 50m
English
Content preview from Oracle Database 11g : Underground Advice for Database AdministratorsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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What does RMAN backup, restore, and recover?
Did you notice the addition of the word "restore" in the title of this section? Hopefully you did, as there is an important difference between restore and recover when it comes to Oracle. Restore is putting back the copy of the object (datafile, controlfile, spfile, archivelog) to a specific location. Recover is applying all of the transactions located in the online or offline (archived) redo and online undo segments to bring the database to a consistent state.
Consistency is where the checkpoint change numbers, for all datafiles agree with the checkpoint SCN of the database. That is your basic goal when doing database recovery. It is important to remember because anything that interrupts this process ...
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