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SQL Man of Mystery

Wes Brown is a PASS chapter leader and SQL Server MVP. He writes for SQL Server Central and maintains his blog at http://www.sqlserverio.com. Wes is Currently serving as a Senior Lead Consultant at Catapult Systems. Previous experiences include Product Manager for SQL Litespeed by Quest software and consultant to fortune 500 companies. He specializes in high availability, disaster recovery and very large database performance tuning. He is a frequent speaker at local user groups and SQLSaturdays.

SQLDIY: Statistics Information Including Last Update

One of the most important aspects of keeping your system running well is updating and managing your statistics. Since the optimizer relies on statistics to determine the best execution plan it is imperative that you keep an eye on them and maintain them just like you would indexes. One of the disappointing things in SQL Server 2005/2008 is the deprecation of some of the functionality of the sysindexes system view. In particular the rowmodctr column, since there is no equivalent in any of the new sys schema DMV’s. With that said, the GatherStatisticsInformation stored procedure listed here is missing that bit of information.What I do include is the last time the statistics were updated for a particular index. It is a rare thing to see information from SQL Server take a step backwards. Hopefully they will correct this mistake and add the modified row count back in to a DMV that is accessible.

Series to Date SQLDIY: Manage and Monitor SQL Server Yourself

Link to the script Gather Information On Statistics

I’m hosting all my scripts from this series on GitHub as I do with all my open source projects.

As always, if you find any bugs please let me know and I will correct them!

Your Homework:

Statistics Used by the Query Optimizer in Microsoft SQL Server 2008

SQL Server 2008 Statistics Jose Barreto (blog|twitter)

Lies, Damned Lies and Statistics Elisabeth Redei

How Stale are my Statistics? Kendra Little (blog|twitter)

And everything on SQL Skills


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