Pass

Sul canale SQLPASS TV è stata pubblicata la sessione “Skewed Data, Poor Cardinality Estimates, and Plans Gone Bad” tenuta da Kimberly Tripp (@KimberlyLTripp) durante lo scorso PASS Summit 2013.

Abstract

When data distribution is heavily skewed, cardinality estimation (how many rows the query optimizer expects each operator to process) can be wildly incorrect, resulting in poor quality query plans and degraded performance. You’ve probably seen the advice to update all statistics if a query plan looks wrong - but is that the right advice? In many cases, no! These are “sledgehammer” approaches, and while they might solve some problems (usually parameter sniffing problems), they don’t solve the actual problem. In this session, you’ll learn a generalized yet tailored-to-the-table way to solve query plan quality problems for very large tables (VLTs). Topics will include creating, using, and updating filtered statistics; using forced parameterization and templatized plan guides; and understanding stored procedures and how they can leverage filtered statistics.

Sul canale SQLPASS TV è stata pubblicata la sessione Building Your T-SQL Tool Kit: Window Function Fundamentals tenuta da Christina E. Leo (@christinaleo) durante lo scorso PASS Summit 2013.

Abstract

Have you pulled a script to identify duplicates from a blog post but couldn’t quite get it to work because you weren’t sure what that ROW_NUMBER() function was doing? Maybe you heard talk about creating running totals without using subqueries, but you got frustrated when the groups weren’t totaling correctly. Or maybe, you’ve never even heard of window functions. All are good reasons to attend this all-demo session, which demystifies this versatile T-SQL tool. First, we’ll break apart the OVER clause, the key to understanding how window functions work. Then we’ll expand on each group of functions that can use the OVER clause: ranking, aggregate, and analytic functions. Finally, we’ll look at real scenarios where this tool works and talk about performance considerations. When you leave, you’ll have the fundamentals you need to fully develop your mastery of window functions.

Sul canale SQLPASS TV è stata pubblicata la sessione Automate Your ETL Infrastructure with SSIS and PowerShell tenuta da Allen White (@SQLRunr) durante lo scorso PASS Summit 2013.

Abstract

Much of your ETL process flow consists of packages that are very similar in structure, capturing data from a single source and transferring that to a single destination. Creating the individual packages can be tedious, and it’s easy to miss something in the process of generating the same basic package over and over again. BI Markup Language makes it easy to build new packages, and PowerShell makes creating the BIML scripts easy. In this session, we’ll see how you can use PowerShell to generate dozens of SSIS packages doing similar tasks from a defined set of ETL sources.

Sul canale PASStv è stata pubblicata la sessione How to Use DMVs to Diagnose Performance Issues tenuta da Glenn Berry durante lo scorso PASS Summit.

Le DMVs (DMV + DMF) forniscono informazioni sullo stato di salute dell’istanza SQL Server. Permettono di diagnosticare problemi di performance e rappresentano uno strumento utilissimo sia per i DBA che per gli sviluppatori; aumentano ad ogni versione di SQL Server e dopo averle toccate con mano non potrete più farne a meno vi consiglio quindi di non perdervi questa sessione!

Segnalo i prossimi appuntamenti live, dedicati alla Business Intelligence con SQL Server, che PASS Business Intelligence Virtual Chapter, ha schedulato per il mese di Novembre 2013.

The “Accidental Business Intelligence Project Manager”

Date: Thursday 7th November - 8:00 PM GMT / 3:00 PM EST / Noon PST Speaker: Jen Stirrup URL: https://attendee.gotowebinar.com/register/5018337449405969666

• You’ve watched the Apprentice with Donald Trump and Lord Alan Sugar. You know that the Project Manager is usually the one gets fired