SQL Server Articles


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Improved Online Operations in SQL Server 2014

Online indexing rebuilding was a major breakthrough from SQL Server to support users re-indexing while the clustered index (or table) and other indexes are available during the index rebuild operation.   However, in real world there are multiple issues with these online operations as it does not have much flexibility. In SQL Server 2014, there are […]

Viewing Execution Plans While Queries are Running

Analyzing execution plans is a key tool when analyzing query performance. As most of you are aware there are two ways of analyzing query plans, namely ‘Include Actual Execution Plan’ and ‘Display Estimated Query Plan’ The Include Actual Execution Plan option will provide the execution plan after the completion of the query. However, this option […]

SQL Server T-SQL Tuning – Temp Tables, Table Variables and Union

In this article series we will focus on the primary points of T-SQL performance tuning. In this first installment I will lopok at tuning temp tables, table variables and the Union command. Temp Tables and Table Variables Most database developers are used to breaking down code into small chunks using  temp tables or table variables  […]

SQL Server T-SQL Tuning -TVF and Scalar Functions

In the first of this series we looked at TSQL tuning for temp tables, table variables and the Union command , we now turn our attention to User Defined Functions – either Table-Valued Functions or Scalar Functions. A UDF is very convenient for centralising business logic as we can specify a set of business logic […]

TroubleShooting SQL Server Memory Consumption

Recently on one of our staging servers had a memory consumption issue and even 32 GB of RAM was looking insufficient and application performance was being impaired. Initially I thought the cause would be poorly designed queries, but after a thorough investigation this turned out not to be the case. I noticed that whenever the […]

Performance Tuning Re-indexing and Update Statistics – A Case Study

Recently we started experiencing a very strange issue in our production reporting environment where the Re-indexing and Update Statistics operation suddenly began taking more than 2 days to complete and was thus causing blockage in the database which in turn caused impairment in application performance. Reporting Server Configuration Details: SQL Server Version: SQL Server 2005 […]

Tuning your SQL Query – Generating a Proper Execution Plan.

Recently one of my developers came to and complained of slow performance on a particular query. During the investigation I noticed that the primary cause was the poor query execution plan. In this article, I will discuss the approach which I used to improve the execution plan. For demonstration purpose, I will be creating a […]

Tips For Minimizing Deadlocks in SQL Server

A deadlock or fatal embrace is a situation which occurs when the a process is waiting for the resource that is locked by a second process and that second process is waiting for a resource that is locked by the first process. In this article, we will learn about ways to minimise deadlocks. Tips for […]

Manage and Monitor Identity Ranges in SQL Server Transactional Replication

Problem When using transactional replication to replicate data in a one way topology from a publisher to a read-only subscriber(s) there is no need to manage identity ranges. However, when using  transactional replication to replicate data in a two way replication topology – between two or more servers there is a need to manage identity […]

Practical Introduction to XML Manipulation Using XQuery in SQL Server

XQuery was developed by W3C as a query language designed to programmatically interact with and manipulate Extensible Markup Language (XML).  XQuery uses XPath methods and expressions to search and retrieve XML data.  In this article, I’d like to show a few simple, practical examples of these implementations. First, let’s create a table to hold sample […]
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