in

SQL Server Blogs

Voices from the UK SQL Server Community
All Tags » tsql » Query Plan (RSS)

Browse by Tags

  • Using a UDF as a SARG. Make a hash of it!

    I am somewhat uncomfortable blogging this, as I feel that it falls into “Polish a turd” category. Having said that, it is a particularly ugly turd and it does polish up rather well. Though as the saying goes, it is still a turd. The evils and inadequacies of UDF (User Defined Functions) in SqlServer...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Fri, Jul 2 2010

  • SQL 101 : Without “ORDER BY”, order is not guaranteed.

    It’s as simple as that. If you don’t specify ORDER BY, then the order of your result set is not guaranteed. Oh sure , there may be situations where the data looks like it is being returned ordered, but this is not really the case. So, for example : CREATE TABLE #Example ( row_id INTEGER ); GO INSERT...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Sun, Jun 27 2010

  • SQL and contiguous data ranges.

    As the saying goes "work smarter, not harder", this is definitely the case for SQL. If you have a poorly performing query, then you are not only affecting that one user but diverting precious machine resources needlessly. This is doubly true if its part of the 20% of code executed 80% of the...
    Posted to SQL and the like (Weblog) by Anonymous on Thu, Aug 27 2009

  • Optimal Query Plans With Unbalanced Data Loads

    Sql Server is great at producing and caching efficient query plans.  However these plans may not be the most efficient based upon the parameters passed into subsequent calls off a stored procedure. In this article I am assuming that you have read both of Erland Sommarskog’s articles The Curse and...
    Posted to SQL and the like (Weblog) by Anonymous on Thu, Aug 27 2009

  • Catch all queries and indexing

    Amongst many others, Gail Shaw has blogged on the subject of catch all queries . On many occasions I have needed to do something similar and found performance to be pretty dire on large tables. Typically I would use dynamic SQL to generate the query but there are occasions where that is not possible...
    Posted to SQL and the like (Weblog) by Anonymous on Thu, Aug 27 2009
Page 1 of 1 (5 items)
Powered by Community Server (Commercial Edition), by Telligent Systems