Sampling ratio - PowerPoint PPT Presentation

Giancarlo Carbonetti, Marco Fortini

Joint UNECE/Eurostat Meeting on Population and Housing Censuses (13-15 May 2008) Sample results expected accuracy in the Italian Population and Housing Census. Giancarlo Carbonetti, Marco Fortini Istat – Italian National Statistical Institute General Censuses Directorate May 13th 2008. Outline.

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INTELLIGENT STATISTICS UPDATE

For most of the application databases, sp_updatestats does a good job of updating the statistics to give a good enough performance. However, sp_updatestats scans only a default sample of rows to arrive at statistics, which can be skewed if there is wide variation of data values with the tables and may not be enough for some applications to generate optimal query plans.

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