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hakkr
If you can find them you could just stat the modified date and size of the raw datafiles or compare md5 hashes of the files.
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Depending on how you can sort the data with sql you may just be able to take a look at the first x rows and/or the last x rows of the table instead of building a complete array.
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<p>
Also depending on your data you could maybe checksum a column.</p>
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