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Message Posted: Thu, 28 Feb 2008 @ 18:02:39 GMT


     
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Subj:   Re: Impacts of adding column to a large table
 
From:   Dieter Noeth

Longauer Juraj wrote:

  I have a large table (~150 GB) on which I want to add a nullable column using ALTER TABLE command. I am curious how big is the impact on the system performance and availibility of the table duration of the lock, adding NULL to each record etc.  


If you add that column using COMPRESS NULL and there're still unused bits available within the presence bytes, this will run immediately without modifying any row.


Dieter



     
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