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Content with tags T-SQL, Execution Plans Rss

   Items 1 to 9 of 9   
 

Join Operations – Hash Match

The way in which SQL Server chooses to join your tables in a query can dramatically affect performance. In this article, Jason Brimhall explains how a hash match works and shows some performance numbers.  Read more...
By Jason Brimhall 2014/03/04 | Source: SQLServerCentral.com | Category: execution plans
Rating: |  Discuss |   Briefcase | 8,370 reads

Parameter sniffing

By Mikael Eriksson 2013/10/17 | Category: parameter sniffing
Rating: (not yet rated) |  Discuss |   Briefcase | 2,581 reads

Variable Declaration

By Paul Cauchon 2013/09/19 | Category: query optimizer
Rating: (not yet rated) |  Discuss |   Briefcase | 2,743 reads

T-SQL Tuesday #43 – Plan Operators

This month’s TSQL-Tuesday is hosted by Rob Farley (blog | twitter), who became a Microsoft Certified Master this past December (congrats!)....  Read more...
By Wayne Sheffield 2013/06/14 | Source: SQLServerCentral.com | Category: blogs
Rating: (not yet rated) |  Discuss |   Briefcase | 1,116 reads

SHOWPLAN_XML

By malls reddy 2013/06/13 | Category: execution plans
Rating: (not yet rated) |  Discuss |   Briefcase | 1,764 reads

Sub query expressions vs. Joins.

Do sub query expressions introduce a performance penalty on retrieving large data sets?  Read more...
By Brian Ellul 2012/01/20 (first published: 2010/07/22) | Source: SQLServerCentral.com | Category: table spool operator
Rating: |  Discuss |   Briefcase | 28,535 reads

Changes to SQL Server 2012 Execution Plans

I’ve been working with execution plans quite a lot in SQL Server 2012. There are a number of changes, most of them associated with new or different functionality. I had not noticed anything really fundamental until recently. I’ve become a huge proponent of always checking the properties of the SELECT statement. There’s so much useful information in there about what’s happened with the plan generation in the optimizer (not low level stuff, but the big picture items) that you should always be checking it first as a fundamental part of your plan examinations.  Read more...
By Grant Fritchey 2011/12/14 | Source: SQLServerCentral.com | Category: execution plans
Rating: (not yet rated)  Rate this |   Briefcase | 6,031 reads

Showplan Operator of the Week - Merge Interval

When Fabiano agreed to undertake the epic task of describing each showplan operator, none of us quite predicted the interesting ways that the series helps to understand how the query optimizer works. With the Merge Interval, Fabiano comes up with some insights about the way that the Query optimizer handles overlapping ranges efficiently.   Read more...
By Additional Articles 2011/01/28 | Source: SimpleTalk | Category: t-sql
Rating:  Rate this |   Briefcase | 2,664 reads

Sub query expressions vs. Joins.

Do sub query expressions introduce a performance penalty on retrieving large data sets?  Read more...
By Brian Ellul 2012/01/20 (first published: 2010/07/22) | Source: SQLServerCentral.com | Category: table spool operator
Rating: |  Discuss |   Briefcase | 28,535 reads
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