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Filtered Statistics in SQL Server

In SQL Server, Filtered Statistics can improve cardinality estimation, i.e. when joining lookup table, or while joining fact table and dimension table. For this reason, SQL Server supports the creation of up to 30,000 statistics on non-indexed columns. Better estimation with filtered statistics can lead to faster query execution against star schema based data warehouses, in many cases by estimating the optimal join strategy, amount of memory and executing the query in parallel.

The below video demonstrates this with hands-on example. SQLTest Tool simulates the hands-on labs for you, no registration necessary. You can practice the online hands-on example while watching the video.

Check out www.sqlvideo.com for additional hands-on videos.

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Ramesh Meyyappan’s SQL Server Performance Tuning Blog

Ramesh Meyyappan (www.sqlworkshops.com) is a SQL Server specialist with expertise in Performance Tuning. Ramesh worked at Microsoft Corporation from 1994 to 2004. Nearly half of that time he worked in Redmond in the development teams - specifically as Program Manager in the SQL Server Development Team responsible for optimizing SQL Server product for SAP. Ramesh now offers onsite and offsite consulting and workshops independently as well as by partnering with various Microsoft Subsidiaries. LinkedIn Profile: http://de.linkedin.com/in/rmeyyappan.

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