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  • SQL Intersection Conference, Las Vegas MGM Grand 10-13 November 2014

    I am very pleased to announce that I will be speaking at the SQL Intersection conference in Las Vegas again this year. This time around, I am giving a full-day workshop, "Mastering SQL Server Execution Plan Analysis" as well as a two-part session, "Parallel Query Execution" during the main conference. The workshop is a ...
    Posted to Page Free Space (Weblog) by Paul White on July 31, 2014
  • Geek City: A Hint of Degrees

    This is just a quick post to describe a test I just ran to satisfy my own curiosity. I remember when Microsoft first introduced the query hint OPTION (MAXDOP N). We already had the configuration option ‘max degree of parallelism’, so there were lots of questions about how the hint interacted with the configuration option. Some people thought the ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on June 3, 2014
  • Did You Know? What settings to always change

      A week ago, I taught my SQL Server 2012 Internals class to a great group of very interactive students. Even though a dozen of them were taking the class remotely, there were still lots of really great questions and and lots of discussion. One of the students asked if I could summarize all the settings that I recommended changing from the ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on June 25, 2013
  • Parallel Execution Plans Suck

    Summary: A deep dive into SQL Server parallelism, and a potential performance problem with parallel plans that use TOP. There was an interesting question asked by Mark Storey-Smith on back in October 2011.  He was looking at the execution plan for a query that counts a million rows from a virtual auxiliary table of ...
    Posted to Page Free Space (Weblog) by Paul White on May 2, 2012
  • Forcing a Parallel Query Execution Plan

    This post is for SQL Server developers who have experienced the special kind of frustration, which only comes from spending hours trying to convince the query optimizer to generate a parallel execution plan.  This situation often occurs when making an apparently innocuous change to the text of a moderately complex query; a change which ...
    Posted to Page Free Space (Weblog) by Paul White on December 22, 2011
  • How Parallelism Works in SQL Server

    You might have noticed that January was a quiet blogging month for me.  Part of the reason was that I was working on a series of articles for Simple Talk, examining how parallel query execution really works.  The first part is published today ...
    Posted to Page Free Space (Weblog) by Paul White on March 5, 2011
  • White Paper on Parallel Processing

      I just ran across what I think is a newly published white paper on parallel  processing in SQL Server 2008 R2. The date is October 2010 but this is the first time I have seen it so I am not 100% sure how new it really is. Maybe you have seen it already but if not I recommend taking a look. So far I haven’t had time to read it ...
    Posted to Andrew Kelly (Weblog) by Andrew Kelly on December 10, 2010
  • Myth: SQL Server Caches a Serial Plan with every Parallel Plan

    Many people believe that whenever SQL Server creates an execution plan that uses parallelism, an alternative serial plan is also cached.  The idea seems to be that the execution engine then decides between the parallel and serial alternatives at runtime. I’ve seen this on forums, in blogs, and even in books.  In fairness, a lot of the ...
    Posted to Page Free Space (Weblog) by Paul White on November 4, 2010
  • So when is Parallel SQL arriving? Denali?

    For some time, Intel C/C++ compilers addons had the ability to automaticly generate parallel code (as in the coder does not have to do it). I also recall hearing some thing about Parallel LINQ, but thats outside the scope of my narrow view of the world. I was just browsing a Sybase script (for the TPC-H benchmark) and notice the following, which ...
    Posted to Joe Chang (Weblog) by jchang on October 4, 2010
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