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Build just one partitioned table.
If business specs are asking to either archive or purge data, a good idea would be to have a partitioning strategy that helps during such archive and/or purge process.
If business specs are asking to keep data forever then partitioning strategy should help your most critical queries.
Revise indexing strategy - queries shouldn't rely only in partitioning strategy but in indexing strategy.
Why are you mentioning hash partitioning? are yo seeing contention during insert?
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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