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Re: Delete Many Rows

Posted by hallpa1@yahoo.com on 03/21/06 22:15

I have been testing heavily on a full copy of the production data.
Unfortunately the test server that I was given is a much slower machine
than the production box.
In my test environment, doing the purge without the indexes is much
faster than purging with the indexes in place. However, it took over
17 hours to rebuild the indexes afterward.
My estimates suggest that purging without the indexes then rebuilding
them will take about 40 straight hours. If I try to do the purge with
the indexes in place, it will take about 200 hours.
If I can get a window large enough, dropping the indexes, purging, and
rebuilding looks like the way to go. If I cannot get that window, then
I have to do it over multiple weekends leaving the indexes in place.
The key is that the indexes must be in place at the end of the window
so that production processing can resume.
Of course these numbers will be much lower on the production box, but
since I cannot test there, I cannot guess how much lower they will be.

 

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