data-konzept

'The last several releases of SQL Server have introduced a slew of new features, as well as improvements in existing functionality. One area of the engine which is easy to overlook is statistics. After all, statistics still get created the same way, they still tell you about the distribution of data, they’re still used by the Query Optimizer… what’s different? The basic function of statistics remains the same – but how they’re used by the Query Optimizer does change depending on the Cardinality Estimator you’re using. There are also several noteworthy changes related to updating statistics and new functionality has been added around viewing statistics information. Altogether, these changes across the latest releases can cause a variation in SQL Server behavior that you weren’t expecting. 

Note: This post is most applicable to SQL Server 2012 and higher, but some detail for prior releases is included for reference (and fun).'...

https://sqlperformance.com/2017/10/sql-statistics/updates-to-statistics