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Content with tag Query Optimizer Rss

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Understanding Graphical Execution Plans - Part 1: Explaining the Plan

Understanding execution plans is a good basic skill for all DBA's and SQL developers. Darren White gives us an overview of what execution plans are in SQL Server and how they are used.  Read more...
By Darren White 2014/02/18 | Source: | Category: execution plan
Rating: |  Discuss |   Briefcase | 12,589 reads

Variable Declaration

By Paul Cauchon 2013/09/19 | Category: query optimizer
Rating: (not yet rated) |  Discuss |   Briefcase | 2,711 reads

Understanding SQL Server Query Optimization Statistics

In this article, you will learn what query optimisation statistics are and how SQL Server query optimizer uses statistics. You will also learn how to create and manage statistics, and what are the different ways to determine when statistics were last updated in SQL Server.  Read more...
By Additional Articles 2013/07/10 | Source: SQL Server Performance | Category: query optimizer
Rating: (not yet rated)  Rate this |   Briefcase | 3,930 reads

Statistics on Ascending Columns

It comes as rather a shock to find out that one of the commonest circumstances in an OLTP database, an ascending primary key with most querying on the latest records, can throw the judgement of the Query Optimiser to the extent that perfomance nose-dives. Fabiano Amorim once again dons snorkel and goggles to explore the murky depths of execution plans to find out why.  Read more...
By Additional Articles 2011/09/16 | Source: SimpleTalk | Category: statistics
Rating:  Rate this |   Briefcase | 2,010 reads

The SQL Server Query Optimizer

To understand how to write SQL code for SQL Server that performs well, it is important to appreciate how the query optimizer works. Ben Nevarez explains the essentials, in a broad sweep through a complex subject, in an article taken from his new book 'Inside the SQL Server Query Optimizer'.  Read more...
By Additional Articles 2011/09/09 | Source: SimpleTalk | Category: query optimizer
Rating:  Rate this |   Briefcase | 4,277 reads
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actual plan (1)    
ascending columns (1)    
estimated plan (1)    
execution plan (1)    
execution plans (1)    
performance (1)    
statistics (1)    
t-sql (1)