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  • Visualizing Data File Layout III

    This is part three of a blog series illustrating a method to render the file structure of a SQL Server database into a graphic visualization. Previous Installments: Part 1 Part 2 Those that have been reading this series might be be thinking, “Is he going to go there?” Well, the answer is “Yes.” This is the GUID clustered index post that had to ...
    Posted to Merrill Aldrich (Weblog) by merrillaldrich on January 29, 2013
  • Optimizing T-SQL queries that change data

    Most tuning efforts for data-changing operations concentrate on the SELECT side of the query plan. Sometimes people will also look at important storage engine considerations like locking and transaction log throughput that can have dramatic effects. As a consequence, a number of common practices have emerged, such as avoiding large numbers of ...
    Posted to Page Free Space (Weblog) by Paul White on January 25, 2013
  • Visualizing Data File Layout II

    Part 2 of a blog series visually demonstrating the layout of objects on data pages in SQL Server Part 1 In Part 1 of this series, I introduced a little demo app that renders the layout of pages in SQL Server files by object. Today I’ll put that app through its paces to show, in vivid color (well, teal, anyway) the destructive power of the famous ...
    Posted to Merrill Aldrich (Weblog) by merrillaldrich on January 23, 2013
  • Visualizing Data File Layout I

    Part 1 of a blog series visually demonstrating the layout of objects on data pages in SQL Server Some years ago a gentleman called Danny Gould created a free tool called Internals Viewer for SQL Server. I’m a visual sort of guy, and I always thought it would be fun and educational to make a simple visualizer, like the one he created, in order to ...
    Posted to Merrill Aldrich (Weblog) by merrillaldrich on January 22, 2013
  • Geek City: Accessing Distribution Statistics

    Distribution statistics are one of the most important sources of information that the Query Optimizer uses to determine a good query plan. In this post, I’m not going to tell you everything about distribution statistics. I’m just going to show you a few tricks for getting access to the statistics. If you want a deeper understanding of what the ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on January 18, 2013
  • Geek City: What Triggered This Post?

    I’d really like to get another post up onto my much neglected blog before the end of 2012. This will also start one of my New Year’s resolutions, which is to write at least one blog post a month. I’m going to tell you about a change in SQL Server that wasn’t announced in any “What’s New” list that I ever saw, perhaps because it was just a chance ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on December 31, 2012
  • Learn More About SQL Server IO and Query Tuning in These Webcasts

    I'm doing two new webcasts next week on Wednesday, December 19th, one in the morning and the other after lunch.   SSDs are a Game Changer for SQL Server Storage No, session is not exclusively about SSDs.  But this is my first session on IO and storage tuning that emphasizes SSDs over hard disks.  As Bob Dylan said ''Times, they ...
    Posted to Kevin Kline (Weblog) by KKline on December 14, 2012
  • Beware of SQL Server and PerfMon differences in disk latency calculation

    Recently sp_blitz procedure on one of my OLTP servers returned alarming notification about high latency on one of the disks (more than 100ms per IO). Our chief storage guy didn’t understand what I was talking about – according to his measures, average latency is only about 15ms. In order to investigate the issue, I’ve recorded 2 snapshots of ...
    Posted to Michael Zilberstein (Weblog) by mz1313 on November 27, 2012
  • Temporary Table Caching Explained

    SQL Server 2005 onward caches temporary tables and table variables referenced in stored procedures for reuse, reducing contention on tempdb allocation structures and catalogue tables.  A number of things can prevent this caching (none of which are allowed when working with table variables): Named constraints (bad idea anyway, since ...
    Posted to Page Free Space (Weblog) by Paul White on August 16, 2012
  • One Week Until Louisville!

    Louisville has a special place in my heart because it was my brother's home for more than 15 years. I spent a lot of time on I-65 traveling from my home town of Huntsville, AL to visit my bro in Louisville and New Albany, after he bought a place on the north side of the mighty Ohio River. It's always felt like a home away from home, ...
    Posted to Kevin Kline (Weblog) by KKline on July 9, 2012
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