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Oracle Undo table Space

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  #1  
Old July 14th, 2004, 09:20 AM
exelahim exelahim is offline
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Question Oracle Undo table Space
My question is about the size of the Undo table space needed.

I have a merge statemnet that will update/ insert a/into a table with 160 millions rows 65 Gig.
The run will have an input of 130 millions and from these
25 millions will be new (inserts) rows and the rest of 100 millions will be updates.
Suppose I'll be the only user what should be the size of the Undo table space to let this run without any space problem ?
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  #2  
Old July 16th, 2004, 12:25 PM
victorpendleton victorpendleton is offline
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Hard to estimate. If possible, I would commit frequently.
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  #3  
Old July 16th, 2004, 02:11 PM
jim mcnamara jim mcnamara is offline
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Just a comment. Read Tom Kyte's book
'expert one-on-one Oracle'

Then come back and say 'commit frequently'

When updating or inserting we commit about every 10000 inserts/updates. Really frequent commits can have serious performance considerations. YMMV.
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Old July 16th, 2004, 09:34 PM
victorpendleton victorpendleton is offline
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Another comment. 160 million rows is muder on a redo log and can wreck havoc on applications sharing that drive space. Your every 10000 for 160 million is pretty frequent.
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Old July 19th, 2004, 09:18 AM
jim mcnamara jim mcnamara is offline
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For his app - ours seldom get to 10K
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