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  • T-SQL Tuesday: What kind of Bookmark are you using?

    I’m glad there is no minimum length requirement for T-SQL Tuesday blog posts, because this one will be short. I was in the classroom for almost 11 hours today, and I need to be back tomorrow morning at 7:30. Way long ago, back in SQL 2000 (or was it earlier?) when a query indicated that SQL Server was going to use a nonclustered index to get ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on June 10, 2013
  • Geek City: Join With Me!

    I remember one of the most surprising changes in SQL Server 2000 2005 was how the graphical plans showed the use of a nonclustered index to seek, and the plan included something that looked like a JOIN to find rows in the base table.  Here’s an example. Although I used SQL Server 2008R2, the graphical plan will be pretty similar to what it ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on February 14, 2013
  • Geek City: Ordered Seeks and Scans

    I got a couple of really great questions during my SSWUG Workshop this morning, as I was discussing seeks and scans, and since the answers to the two questions are very related, I decided to address both of them in more detail in this blog post. Most people think about a seek operation as retrieving just one or a few rows, and a scan as ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on January 21, 2011
  • A Tale of Two Index Hints

    If you look up Table Hints in Books Online, you’ll find the following statement: If a clustered index exists, INDEX(0) forces a clustered index scan and INDEX(1) forces a clustered index scan or seek. If no clustered index exists, INDEX(0) forces a table scan and INDEX(1) is interpreted as an error. The interesting thing there is ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on September 22, 2010
  • The Impact of Non-Updating Updates

    From time to time, I encounter a system design that always issues an UPDATE against the database after a user has finished working with a record – without checking to see if any of the data was in fact altered.  The prevailing wisdom seems to be that “the database will sort it out”.  This raises an interesting question: how smart is SQL ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on August 10, 2010
  • Did You Know? I'm doing 3 more online seminars with SSWUG!

    As I told you in April, I recorded two more seminars with Stephen Wynkoop, on aspects of Query Processing. The first one will be broadcast on June 30 and the second on August 27. In between, we'll broadcast my Index Internals seminar, on July 23.  Workshops can be replayed for up to a week after the broadcast, and you can even buy a DVD of ...
    Posted to Kalen Delaney (Weblog) by Kalen Delaney on June 11, 2010
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