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The 2008 R2 Bug Fix That Breaks RCSI

 Posted by Paul White on July 30, 2014  13 Responses »
Jul 302014
 

Paul White (@SQL_Kiwi) details a regression bug in RCSI caused by a fix for a different bug. If you are running SQL Server 2008 R2, you should read this.

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 Tagged with: bug, deadlock, isolation

Should new index columns be in the key, or included?

 Posted by Erin Stellato on July 24, 2014  11 Responses »
Jul 242014
 

Erin Stellato of SQLskills compares the impact of adding additional index columns, by choosing the key or the INCLUDE list – with interesting results.

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 Tagged with: INCLUDE, indexes

A Subquery Cardinality Estimation Bug

 Posted by Paul White on July 22, 2014  3 Responses »
Jul 222014
 

Citing several examples, Paul White (@SQL_Kiwi) talks through a cardinality estimation bug that can be difficult to spot.

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 Tagged with: bug, cardinality estimator

Another Way to View Automatic Updates to Statistics

 Posted by Erin Stellato on July 11, 2014  4 Responses »
Jul 112014
 

Erin Stellato of SQLskills shows how to use SQL Sentry Plan Explorer and SQL Sentry Performance Advisor to see automatic statistics updates.

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 Tagged with: SQL Sentry, statistics

SQL Server Isolation Levels : A Series

 Posted by Paul White on July 1, 2014  No Responses »
Jul 012014
 

Paul White (@SQL_Kiwi) has put together a fantastic series on concurrency, the ACID properties of statements and transactions, and isolation levels in SQL Server.

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 Tagged with: ACID, concurrency, isolation, isolation levels

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