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Difference Between Redo logfiles,Undo Tablespace,Archive logfiles, Datafile

825925Nov 19 2011 — edited Nov 21 2011
Can some please highlight difference between Redo and Undo logs
Also why do we need seperate archive logs when the data from redo logs can be directly written to Datafiles..

You help will be highly appreciated...
This post has been answered by Mich Talebzadeh on Nov 19 2011
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Locked on Dec 19 2011
Added on Nov 19 2011
#general-database-discussions
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