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Archives of the TeradataForum
Message Posted: Wed, 06 Jun 2007 @ 09:27:00 GMT
| Subj: | | Re: Minimal Stats Sampling and a well-informed |
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| From: | | Geoffrey Rommel |
| | The number of distinct values will end up being extrapolated upwards, depending on the percentage of rows sampled. If 2% of the rows were
sampled, then you could expect to see about 50 times more distinct values in the produced estimate.... | |
Carrie, this seems odd to me. Two percent is a large sample -- far more than is needed for a 99% confidence level. Why doesn't the sampler
simply accept what it finds? Is it because of a fear that the sample isn't "truly random"?
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