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Everyday SQL

Patrick Keisler is a MCTS and MCP. For over 12 years, he has been been a database administrator for a major investment bank, Wells Fargo Securities. During that time, he has gained considerable knowledge in Microsoft SQL Server by supporting hundreds of applications ranging from high-volume trading applications to massive data warehouses.

Archives: April 2014

What is a Non-Clustered Columnstore Index?

First introduced in SQL Server 2012, the Columnstore index is a new in-memory feature that allows for the creation of indexes that are stored in a column-wise fashion. It is targeted for data warehouses and can improve query performance by 10 to 100x. A columnstore index stores data in a…

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Posted in Everyday SQL on 29 April 2014

The system_health Extended Event Session

When I first started poking around in SQL Server 2012, I noticed an extended event session called “system_health” was created by default. It took me a few months before I really dug into the session details to see what it was capturing. But once I did, I was pretty amazed.

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Posted in Everyday SQL on 8 April 2014