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  • Nested Loops Prefetching

    Nested loops join query plans can be a lot more interesting (and complicated!) than is commonly realized. One query plan area I get asked about a lot is prefetching. It is not documented in full detail anywhere, so this seems like a good topic to address in a blog post. The examples used in this article are based on questions asked by Adam ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on August 30, 2013
  • Join Performance, Implicit Conversions, and Residuals

    You probably already know that it’s important to be aware of data types when writing queries, and that implicit conversions between types can lead to poor query performance.  Some people have gone so far as to write scripts to search the plan cache for CONVERT_IMPLICIT elements, and others routinely inspect plans for that type of thing when ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on July 18, 2011
  • Heaps of Trouble?

    If you’re not already a regular reader of Brad Schulz’s blog, you’re missing out on some great material.  In his latest entry, he is tasked with optimizing a query run against tables that have no indexes at all.  The problem is, predictably, that performance is not very good.  The catch is that we are not allowed to create any ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on December 9, 2010
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