Re:Ask HN: How do big web sites roll out new versions?
by brianm on Saturday December 27, 2008 @04:18PM
(#411374)
Once you are sure you are never going to roll back to the old code you can wipe out the old columns.
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Re:Ask HN: How do big web sites roll out new versions?
by gaius on Saturday December 27, 2008 @04:35PM
(#411389)
In practical terms you generally don't tho'. You might need them again, for example, for some as-yet-unplanned new feature. And doing so is of limited value anyway in many databases, you won't get the space back without a re-org and that's a costly operation to do hot, if you even can at all.