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Content with tag Performance Rss

   Items 1 to 20 of 97    Older >>
 

Investigating the Cause of SQL Server High CPU Load Conditions When They Happen

Any DBA who is trying to find the cause of an intermittent problem with a server or database dreams of being able to use a query or procedure take a snap of the relevant variables at the point when the problem occurred. Laerte takes an example of a slow-running query hogging resources to show that you can run queries when a WMI alert is fired, and save the results for later inspection, whenever it happens.  Read more...
By Additional Articles 2017/09/20 | Source: SimpleTalk | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 2,863 reads

Five Mistakes Performance Tuners Make

Erik Darling explains why your queries aren't scaling in production.  Read more...
By Additional Articles 2017/09/06 | Source: Brent Ozar Unlimited Blog | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 4,744 reads

Performance Myths : Oversizing string columns

Aaron Bertrand shows a quick demo that illustrates why you should be very careful about oversizing varchar / nvarchar columns.  Read more...
By Additional Articles 2017/08/02 | Source: SQLPerformance.com | Category: performance
Rating:  Rate this |   Briefcase | 5,752 reads

Performance Myths: Oversizing string columns

Aaron Bertrand shows a quick demo that illustrates why you should be very careful about oversizing varchar / nvarchar columns.  Read more...
By Additional Articles 2017/07/13 | Source: SQLPerformance.com | Category: performance
Rating:  Rate this |   Briefcase | 5,784 reads

Performance of OBJECT_NAME() & Co.

Read more...
By Thomas Franz 2017/07/10 | Category: performance
Rating: (not yet rated) |  Discuss |   Briefcase | 833 reads

Properly Persisted Computed Columns

Paul White walks through a new trace flag in SQL Server 2016 designed to yield better execution plans (and performance) for queries involving computed columns.  Read more...
By Additional Articles 2017/06/20 | Source: SQLPerformance.com | Category: trace flags
Rating: (not yet rated)  Rate this |   Briefcase | 4,115 reads

UNION ALL Optimization

Paul White digs into row goals as he explains some interesting and inconsistent behavior with UNION ALL queries in SQL Server.  Read more...
By Additional Articles 2017/06/13 | Source: SQLPerformance.com | Category: union all
Rating: (not yet rated)  Rate this |   Briefcase | 5,541 reads

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.  Read more...
By Additional Articles 2017/06/01 | Source: SQLPerformance.com | Category: performance
Rating:  Rate this |   Briefcase | 4,257 reads

Combining R and SQL Server to diagnose performance bottlenecks

Using clustering algorithms to analyse index usage data from SQL Server’s DMVs & simplify complex performance investigations.  Read more...
By Nick Burns 2017/05/29 (first published: 2015/12/07) | Source: SQLServerCentral.com | Category: performance
Rating: |  Discuss |   Briefcase | 9,088 reads

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.  Read more...
By Additional Articles 2017/05/11 | Source: SQLPerformance.com | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 5,344 reads

Harmful, Pervasive SQL Server Performance Myths

Aaron Bertrand begins a new series around disproving prevalent myths regarding SQL Server performance.  Read more...
By Additional Articles 2017/04/13 | Source: SQLPerformance.com | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 4,371 reads

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 2017/03/10 (first published: 2014/02/18) | Source: SQLServerCentral.com | Category: execution plans
Rating: |  Discuss |   Briefcase | 29,619 reads

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.  Read more...
By Additional Articles 2017/03/06 | Source: Database Journal | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 4,899 reads

Performance Dashboard Error: Could not find stored procedure

In this article, you will learn how to troubleshoot error when you try to launch the main Dashboard Report.  Read more...
By Ganapathi varma Chekuri 2017/02/27 | Source: SQLServerCentral.com | Category: sqlserver2008r2
Rating: |  Discuss |   Briefcase | 784 reads

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.  Read more...
By Additional Articles 2017/02/23 | Source: SimpleTalk | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 8,070 reads

SQL Server vs SQL Server v.Next

An introduction to the basics of current SQL Server vs v.Next Performance Testing.  Read more...
By Henrico Bekker 2017/02/15 | Source: SQLServerCentral.com | Category: vnext
Rating: |  Discuss |   Briefcase | 2,143 reads

Compression and its Effects on Performance

Erin Stellato takes a look at the new COMPRESS and DECOMPRESS functions, comparing their impact on space and performance to traditional data compression.  Read more...
By Additional Articles 2017/02/15 | Source: SQLPerformance.com | Category: compression
Rating: (not yet rated)  Rate this |   Briefcase | 6,069 reads

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.  Read more...
By Additional Articles 2017/02/09 | Source: MSSQLTips.com | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 3,869 reads

Performance of the SQL MERGE vs. INSERT/UPDATE

The SQL MERGE statement offers convenience, safety and elegance, but how does it perform compared to other methods?  Read more...
By Dwain Camps 2017/02/03 (first published: 2013/10/28) | Source: SQLServerCentral.com | Category: merge
Rating: |  Discuss |   Briefcase | 37,047 reads

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.  Read more...
By Additional Articles 2016/12/21 | Source: MSSQLTips.com | Category: performance
Rating: (not yet rated)  Rate this |   Briefcase | 5,367 reads
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