SQL Server Articles


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Monitor SQL Server Replication Jobs

The Replication infrastructure in SQL Server is implemented using SQL Server Agent to execute the various components involved in the form of a job (e.g. LogReader agent job, Distribution agent job, Merge agent job) SQL Server jobs execute a binary executable file which is basically C++ code. You can download all the scripts for this […]

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  […]

Multiple Table Queries in SQL Server – UNION, EXCEPT, INTERSECT, Subqueries, and Joins

There are several for creating queries that return data from multiple tables. The one you choose depends on your data retrieval requirements and the underlying structure of the database. In this three part article series, I will demonstrate how to combine data from multiple tables by using UNION, INTERSECT, and EXCEPT. You’ll perform advanced queries […]

SQL Server Logical Reads – What do they really tell us?

SQL Server trace, the most common tool DBAs use to evaluate query performance, provides the ‘logical reads’ counter on which many DBAs rely for evaluating a query’s I/O performance. In this article, we will examine this counter’s true meaning and provide examples that prove it can sometimes be quite misleading… I am sure you have […]

Primer on Selecting Data Using Entity Framework

This question about selecting data using Entity Framework on StackOverflow got me thinking that a lot of LINQ to Entities code samples show very little consistency in how data is selected. Find(), Single(), SingleOrDefault(), First(), and FirstOrDefault() are often used interchangeably. The first issue to address is using Where() in the data selection statement. Where() […]

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 […]

Monitoring Table Size Growth in SQL Server

General In this article I introduce a simple process that saves tables size information at points in time which latter allows for tracking down table growth over time. The process is useful in monitoring data growth over time and lets you see what tables are growing rapidly in what databases and can also help in […]

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 […]

Techniques to Monitor SQL Server memory usage

Memory has a dramatic impact on SQL Server Performance. Fortunately, in SQL Server you can either use DMVs, , Extended Events, sp_server_diagnostics system procedure or SQL Profiler to server memory usage and track down root cause of SQL Server memory bottlenecks. In this article, I will provide you high-level overview of these memory-related tools. Dynamic […]

Monitoring Transactional Replication – The Distribution Queue

Note : The scripts for this article can be downloaded here. Monitoring the distribution queue is an important link in the chain of transactions delivery over a replicated topology. A chain that includes the log reader agent scanning the published database’s transaction log for commands to be moved to the distribution database from which a […]