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I don't think Oracle keeps track on where you asked for blocks or rows sampling.
At the end of the line Oracle would sample rows, whatever random rows when you ask for rows or all the rows in a sample of blocks when you ask for blocks.
In general you are going to get a better random sample when asking for rows.
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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