SQL Server Articles


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12 Essential Steps After Installing SQL Server

Rolling out SQL Servers is a key task for DBAs.  While for some DBAs this can be a frequent exercise, others will have to face it one time or other throughout their career in an organisation. Successfully planning an installation requires a fair bit of knowledge about SQL Server and a basic understanding of the […]

Understanding SQL Server Query Optimization – Part 3

Editor’s Note: In the first of this four part series, I gave an overview of the tools and techniques of query optimization in SQL Server. In the second part, I talked about the process of displaying and interpreting query execution plans. I also showed how to generate query execution plans usin gSQL Server Management Studio, […]

SQL Server Hardware Optimization

An important concern in optimizing the hardware platform is hardware components that restrict performance, known as bottlenecks. Quite often, the problem isn’t correcting performance bottlenecks as much as it is identifying them in the first place. Start with obtaining a performance baseline. You monitor the server over time so that you can determine Server average […]

Configuring the Maximum Degree of Parallelism

A commonly altered setting is Maximum Degree of Parallelism (MAXDOP), which controls the maximum number of CPUs that can be used in executing a single task. For example, a large query may be broken up into different parts, with each part executing threads on separate CPUs. Such a query is known as a parallel query. […]

Physical Join Operators in SQL Server – Nested Loops

SQL Server implements three different physical operators to perform joins. In this article series we will examine  how each  operators works, its advantages and challenges. We will try to understand the logic behind the optimizer’s decisions on which operator to use for various joins using (semi) real life examples and how to avoid common pitfalls. […]

Entity Framework Gotchas

Entity Framework is fast becoming the default data access method for small to medium sized apps in .NET. Whilst it offers a lot of benefits in terms of productivity and security, working with EF is often very different from working with the standard ADO.NET data-access objects and poses several common issues or ‘gotchas’: Using Different […]

Time Series Algorithms in SQL Server

This is the fourth article on data mining series. The below are the previous articles in this series. Shopping Basket Analysis in SQL Server Using Decision Trees in SQL Server Data Mining Cluster Analysis in SQL Server This article focuses Time Series Algorithms which are a forecasting technique. One of the most common algorithms used […]

Physical Join Operators in SQL Server – Merge Operator

In Part I of this series on physical join operators we looked at Nested Loops. We now turn our attention to the Merge operator. For this article series I am using an analogy of two sets of standard playing cards. One set with a blue back and another with a red back that need to […]

Understanding SQL Server Change Data Capture

DBA’s often encounter a requirement to audit DML activity such as INSERT/UPDATE/DELETE operations executed against a particular table or a group of tables in a particular database. Change Data Capture (first introduced in SQL Server 2008 R2) can greatly assist this function. Only members of sysadmin fixed server role can enable the Change Data Capture […]

SQL Server T-SQL Performance Tuning – Views

In this installament of the TSQL Performance Tuning series we turn our attention to Views Views Used Within Joins or Where Conditions As a generic concept, an inner join with an object which has insufficient indexing will result in index scanning or perhaps a table scan which also applies for Views Impacts: • Much CPU […]