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Message Posted: Tue, 19 Mar 2002 @ 13:59:16 GMT

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Subj:   Re: ALTER TABLE Question
From:   James A. Judge

If this is the only option then it depends on the configuration; (i.e. model type, number of nodes, number of vamps, number of columns, number of rows, rows per block). You will have to update every row header/and/or row depending on whether the column is NULLable or not, or you have a default value you are inserting and could specify COMPRESS on that value, etc.. It is a single unit of work that locks the table until completion so you have to weigh the cost of table unavailability and error recovery time against other options.

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