Performance Myths : Oversizing string columns

Aaron Bertrand shows a quick demo that illustrates why you should be very careful about oversizing varchar / nvarchar columns.

Performance Myths: Oversizing string columns

Aaron Bertrand shows a quick demo that illustrates why you should be very careful about oversizing varchar / nvarchar columns.

Performance of OBJECT_NAME() & Co.

Performance Myths : Truncate Can't Be Rolled Back

Derik Hammer sets out to disprove another pervasive performance myth : TRUNCATE is faster than DELETE because it isn't logged and can't be rolled back.

Performance Myths: Table variables are always in-memory

Guest author Derik Hammer dismisses the common myth that table variables perform better than temp tables because they are always in memory.

Harmful, Pervasive SQL Server Performance Myths

Aaron Bertrand begins a new series around disproving prevalent myths regarding SQL Server performance.

Finding the Worst Performing TSQL Statement

Greg Larsen explains how you can use Dynamic Management Objects and stored procedures to return your worst performing T-SQL statements.

Performance Surprises and Assumptions : GROUP BY vs. DISTINCT

Aaron Bertrand acknowledges that DISTINCT and GROUP BY are usually interchangeable, but shows there are cases where one performs better than the other.

How Incorrect SQL Server Table Statistic Estimates Can Cause Slow Query Execution

Ben Snaidero explains that if you are updating your SQL Server table statistics nightly, but still seeing occasional poor performance with some of the queries being executed against my database, statistics could be the issue.

Disconnecting SQL Server connections after query execution

One way to improve SQL Server performance is to use as few resources as possible. In this post Rahul Mehta demonstrates how you can do this by disconnecting queries post-execution with a simple change in SSMS.