March 10, 2008 at 1:50 pm
Hello,
I have inherited a script which creates new columns on a table, and then drops some other columns on the same table.
My question is, would there be any performance improvement, if I were to drop the unwanted columns first, before adding the new columns?
Thanks
March 10, 2008 at 2:06 pm
Maybe.
If you add columns not null with an actual default value, rows will be rewritten, so in that case, yes , then the old columns will be gone.
Otherwise no because the drop column is only a "logical" drop.
Only at maintenance time (rebuild or maintenanceplan) rows will be
rewritten according to the new columns.
Johan
Learn to play, play to learn !
Dont drive faster than your guardian angel can fly ...
but keeping both feet on the ground wont get you anywhere :w00t:
- How to post Performance Problems
- How to post data/code to get the best help[/url]
- How to prevent a sore throat after hours of presenting ppt
press F1 for solution, press shift+F1 for urgent solution 😀
Need a bit of Powershell? How about this
Who am I ? Sometimes this is me but most of the time this is me
Viewing 2 posts - 1 through 1 (of 1 total)
You must be logged in to reply to this topic. Login to reply