SQL Server Articles


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Improving 2D Range Query Performance in SQL Server

When using the BETWEEN operator on multiple columns, you are likely using a 2D range query.  Such queries perform very poorly in SQL Server.   This article will tell you how you can often use additional information to rewrite such queries for much better performance.  We’ll conclude by rewriting an actual BETWEEN query in a manner […]

Controlling Growth of a msdb Database

I recently encountered a situation where the drive hosting Sharepoint Databases in a Staging environment ran out of space. I logged onto the server and found that the msdb database has itself occupied 38 GB of the total disk space. Msdb database generally contain maintenance information for the database such as backups, log shipping and […]

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 […]

Shopping Basket Analysis in SQL Server

A famous super market chain in USA once observed that men who are buying beer for weekend tend to buy nappies for their kids. This revelation enabled the chain in increase sales volume and revenue by placing the items in close proximity to eachother. An alternative approach would have been to move the items apart […]

Replicating A Volume Of Large Data via Transactional Replication

During weekend maintainence, members of the support team executed an UPDATE statement against the database on the OLTP Server. This database was a part of Transactional Replication and the database on the subscriber was used by the SSRS reports. The UPDATE statement impacted around 3500000 records. Once the UPDATE statement was executed, the Replication procedure […]

SQL Server Performance Tuning – Index Tuning

In earlier installments of this series we looked at T-SQL Performance optimizations along with different T-SQL practices, we can now turn our attention to the second part of this series which is index Tuning In looking into Views we will break the article into two sections : Basic Index Tuning using DTA (Database Tuning Advisor) […]

Common Table Expressions (CTE) for SQL Server Developers

What is A CTE? A CTE is a temporary view that exists only in the scope of running query. A CTE is similar to a view but a CTE is embedded into the query. CTEs can be used in Stored Procedures, User Define Functions (UDFs), Triggers and Views but not in Indexed Views. Below is […]

Using Decision Trees in SQL Server

As a practical introduction to decision imagine you are assessing the risk of a PC being infected with a virus. The below data on factors influencing affecting the risk of a PC being infected with a virus is available on MSDN. Shares files Uses scanner Infected before Risk Yes Yes No High Yes No No […]

Does Transactional Replication Include Structural Changes Made to a Database

We typically use Transactional Replication for Reporting purposes. In Transactional Replication, the idea is to replicate the changes done on the Publisher Database (OLTP) onto the Subscriber Database (Reporting).  The main challenge in Replication is whether it will replicate the structural changes made on the Publisher database successfully onto the Subscriber database. For Demonstration purposes, […]

Does LogShipping Include the Structural Changes Made to the Database?

Recently a client asked me “ Does LogShipping ship the Create Table, Alter Table, Drop Table commands onto the Secondary Server?”. Obviously the answer to his question was “Yes” but I wanted to be 101% sure before committing something to him. In this article we are going to prove that LogShipping not only propogates the […]

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