Re: Delete + Insert versus Update
- From: "Norman Dunbar" <norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>, <peters@xxxxxxxxx>
- Date: Thu, 16 Feb 2006 15:34:05 +0000
Peter,
My initial, off the top of my head, thought is simple :
in an UPDATE, the undo holds the before 'image' of the changed
columns.
In a DELETE, the whole row is in the undo.
An INSERT, as far as I remember, holds the rowid as all it has to do is
delete the row.
So straight away there's a difference.
As for indexes, an UPDATE is a DELETE/INSERT anyway.
As ever, untested (yet) !
Cheers,
Norman.
Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.
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