New Article – How expensive are column-side Implicit Conversions?

Last week I blogged about Implicit Conversions that cause Index Scans, and showed two charts for where implicit conversions could result in an index scan operation instead of an index seek during query execution.  As a part of writing that blog post I thought it would be interesting to also look at the performance overhead […]

New Article on SQLPerformance.com comparing “Observer Overhead” of Trace vs Extended Events

I have been so busy this week that I didn’t get a chance to blog about this yesterday when it happened, but I had a new article published on SQLPerformance.com that compares the performance impact or "observer overhead" of using SQL Trace and Extended Events.  I had a lot of fun running different benchmarks for […]

Announcing the SQLskills Availability Group Demonstrator

This spring at SQL Connections, I presented a pre-conference seminar with Kimberly on the new features in SQL Server 2012, including Availability Groups.  While on my flight to Las Vegas, I was working on an application in C# that motivated me to write a new demonstrator application for use with Availability Groups.  I spent a […]

Wow… An online calculator to misconfigure your SQL Server memory!

Properly configuring SQL Server is an important factor in having a stable environment that performs well.  While there is a lot of good guidance available for how to best configure SQL Server, the specifics of any given implementation is a very big “It Depends…” and one of the things that we do in our Immersion […]

Providing attribution when blogging is an easy way to avoid plagiarism

Plagiarism online is unfortunately a very common problem.  Over the last few years, there have been numerous circumstances where a blog or website has done a verbatim word for word copy of blog posts written by other authors/bloggers online.  These are clear-cut cases where plagiarism has occurred.  However, plagiarism doesn’t have to be a verbatim […]

How much memory does my SQL Server actually need?

Traditionally questions about how much memory SQL Server needs were aimed at how to appropriately set the 'max server memory' sp_configure option in SQL Server, and in my book the recommendation that I make is to reserve 1 GB of RAM for the OS, 1 GB for each 4 GB of RAM installed from 4–16 […]

Looking at External Disk Performance using USB 3.0 and eSATA with SSD

I recently did some drive upgrades in my personal laptops and as a result I had a couple of SSD drives sitting around that I wanted to make use of.  A few weeks ago I purchased a new OCZ Agility 3 240GB SATA III SSD from Newegg when it was on sale and at the […]

What a year it has been!

A year ago today, Paul Randal (Blog | Twitter) first blogged about my joining the SQLskills team as the first full time employee.  I can still remember the first time that I met Paul at SQL PASS in 2008, and I am still amazed that I work with the best in the industry over a […]

Network Binding Order Warning during SQL Server Failover Cluster Setup

Yesterday I was asked by email about a problem that someone encountered associated with a SQL Server Failover Cluster configuration that I have run into a number of times myself, and I have had questions about repeatedly in the past.  The problem is that during the SQL Server Setup Validation of the environment, a warning […]

New Article Online – Great SQL Server Debates: Buffer Cache Hit Ratio

My latest article on Simple-Talk was published this morning.  In this article I dig into the actual meaning of one of the performance counters I often see mentioned on the forums, but in a completely incorrect context. Great SQL Server Debates: Buffer Cache Hit Ratio

New Article Online – Great SQL Server Debates: Lock Pages in Memory

After a recent discussion about Lock Pages in Memory on Twitter, I wrote an article that talks about the history of Lock Pages in Memory and the differing opinions on the appropriate usage of Lock Pages in Memory for 64 bit instances of SQL Server.  Great SQL Server Debates: Lock Pages in Memory Thanks to […]

New AlwaysOn_health Extended Events Session in SQL Server 2012 RC0

While setting up my new Availability Group using SQL Server 2012 RC0 tonight, I noticed an interesting new addition to Extended Events associated with Availability Group configuration in the Release Candidate.  When you setup an Availability Group in RC0, another default Event Session is created on the servers that participate in the Availability Group to […]

SQL Server and VMware: A Potentially Fatal Combination? That’s Nonsense!

This morning Paul received an email from a member of the community that was asking if it is safe to run SQL Server inside of a VM and whether we would suggest running databases in virtual machines or not.  The root of the question being asked was an article that the person had read back […]

Just in time for PASS – Troubleshooting SQL Server: A Guide for the Accidental DBA

Just over two years ago, right before PASS Summit 2009, I got the insane idea after finishing Chapter 3 for the SQL Server 2008 Internals and Troubleshooting book that I wanted to write another book based on my experiences answering questions on the MSDN forums that would be based on the top 10 most frequently […]

Finding what queries in the plan cache use a specific index

In the last 48 hours I have seen two different people having the exact same problem so I thought that I would go about blogging some code I’ve had lying around for a while and been meaning to blog that would help them with finding the root cause of their problems.  In both cases, the […]

Building a Completely Free Playground for SQL Server – (1 of 3) – Downloading the Software and Setting up a Windows Server 2008R2 VM Template

For the last few years, I have always had a personal virtual playground for SQL Server setup on my laptop that allowed me to not only learn about new features in SQL Server, but also demonstrate complex topics hands on during presentations.  I recently had to rebuild my playground from the ground up and as […]

Certificate Signing Stored Procedures in Multiple Databases

Yesterday I received an email asking me a question related to my Using a Certificate Signed Stored Procedure to Execute sp_send_dbmail on SQL Server Central that intrigued me enough that I had to put a couple of minutes into actually figuring out what the problem the being encountered was.  In the article, I show how […]

Missing The Details Can Cause Such A Mess

This blog post is brought to you complements of tonight’s dinner meal.  My entire life I have been eating Greek food, mainly because I come from a Greek background on my fathers side, but also because its really good food.  I can’t tell you how many times in my life I have seen someone in […]

Reflecting on the MCM Exam Experience

When Microsoft announced that changes were being made to the Microsoft Certified Masters program for SQL Server 2008 last year I was initially pretty bummed out. I had been hoping to be able to attend one of the onsite MCM rotations at Microsoft. I wasn’t looking forward to the expense associated with that, but I […]

Does the tempdb Log file get Zero Initialized at Startup?

While working on a problem today I happened to think about what the impact to startup might be for a really large tempdb transaction log file.  Its fairly common knowledge that data files in SQL Server 2005+ on Windows Server 2003+ can be instant initialized, but the transaction log files can not.  If this is […]