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In the example above, we showed how time-consuming updating statistics can be for a large number of table rows, and how the SAMPLE parameter can help.The next question is whether you should use the default SQL Server sampling rate, or specify your custom sampling rate using the SAMPLE parameter.In some situations, statistics are not automatically updated and optimal performance is not provided.That’s when SQL Server statistics should be manually updated.In this example, we will use the Adventure Works database, the Person. The table contains 19,614 rows and we will insert additional 10,000 records. After updating table statistics, the correct values are shown. The All density value is calculated as 1/total number of distinct rows.In the first case it’s 1/19,614 = 0.00005098099 = 5.098399102681758e-5 In the second, it’s: 1/29,614 = 0.00003376781 = 3.376781252110488e-5 The values are of the same order of magnitude and the difference can be neglected.Although updated SQL Server statistics provide better execution plans, keep in mind that updating requires time and query recompilation also, which can slow down SQL Server performance.

SAMPLE – the new statistics are created by sampling a specific number of table/view rows.

NORECOMPUTE – after the statistics are updated, the AUTO_UPDATE_STATISTICS option is set to off, and no further auto-updates of the statistics are possible, unless the option is set back to on.

The statistics can be updated only by executing the UPDATE STATISTICS statement or sp_updatestats stored procedure.

Even if the obsolete statistics are used, there will be almost no performance degradation.

However, this is valid only for tables with a small number of records.




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