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Reverse purging - which is pretty much what your general procedure does - is a good alternative if you have to purge much of the data, much as in 90%+ of the data keeping just the remaining 10%- of it.
I wouldn't do #4... instead I would rename original table as *_old, rename temp table are the real deal then build indexes.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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