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Message Posted: Thu, 10 Nov 2005 @ 19:36:58 GMT

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The statistics tell the optimiser about max/min data values, the number of rows, number of nulls. This is more important when a column has very skewed data values (i.e. a large percentage of rows contain the same data value for a specific column).

Statistics don't actually tell the optimiser anything about the distribution of the rows across the AMPs.

Cheers,

Dave

Ward Analytics Ltd: Information in motion ( www.ward-analytics.com )

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