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Twenty minutes for half a billion rows doesn't look that bad.
You may want to try append hint.
Also, if tables are partitioned you may want to use parallel processing; for a few partitions you may want to set degree of parallelism to the number of partitions.
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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