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difference between redo log buffer and undo tablespace

579729Oct 12 2007 — edited Oct 12 2007
Could you please tell me what are these two things and when these are used?Suppose I am INSERTING or MODIFYING or DELETING rows from a table, then what happens? Is the new data is first written into undo tablespace and then written into redo log buffer or something else?Why we need undo, can't we rollback using Redo log buffer?
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Locked on Nov 9 2007
Added on Oct 12 2007
#general-database-discussions
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