Effective Indexes for Beginners

-
I've created a presentation for the August SQL User Group which is about using 'sys.dm_db_index_usage_stats' DMV in order to evaluate your index usage.

The presentation and code sample is available to download on the right.

Comments

Anonymous said…
Hi Amanda, thanks for making the defrag indexes document available for download.
I ran it for one of our databases. In the results grid are returned two tables - before and after. The first table has 110 rows and the second table has 644 rows. Do you know why the second table has more rows?
Jonathan
20 August 2009 at 09:33
Manda QoP said…
Hi Jonathan,

I'm assuming you've run the script to defrag all indices? The one
with the huge comment at the top? If this is the case then the final
result set will show all indices on your table. The reason for this
is that the first result set only shows you indices that are greater
than 5% fragmented so that you can see which indices need to be
defragged. The final result set shows ALL indices on your database so that you can check to make sure defragmentation has occurred
correctly. If it has and an index has been defragged to below 5%
then it would disappear from your results set if we didn't open it up
to show all indices.

Cheers,
Amanda
20 August 2009 at 10:31
Post a Comment

Popular posts from this blog

Yay - It works! Rebuild/Reorganize all indexes in one go - woo hoo

-
/*Version 1 of my script to fix all fragged indexes on a database */ /*Must be logged in as [sa] for this to work, if not, you will get permissions errors*/ /*You should be able to copy and paste this script in its entirity to your SQL 2005 or higher query window and run it without altering anything other than the USE .*/ /*Perform a 'USE ' to select the database in which to run the script.*/ USE AdventureWorks GO -- Make sure temp table doesn't exist IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tmp_fraglist]') AND type in (N'U')) DROP TABLE [dbo].[tmp_fraglist] GO -- Declare variables SET NOCOUNT ON DECLARE @tablename NVARCHAR (255) DECLARE @indexname NVARCHAR (255) DECLARE @indextype NVARCHAR (255) DECLARE @execstr NVARCHAR (255) DECLARE @pagecounts INT DECLARE @frag DECIMAL DECLARE @reorgFragSize DECIMAL DECLARE @rebldFragSize DECIMAL DECLARE @numrecords INT DECLARE @rowcount INT DECLARE @errorMessage
Read more

The Grace Jones

-
Well, we finished recording the CD and now all the hard work is starting, the editing, mixing, production etc... We've also got some guys working on a video for us which sounds as though it's going to be interesting. Time to sell the house in order to pay for the tour of Ireland next year I guess. :)
Read more

What is a geek?

-
Someone raised an interesting point on Monday night at a GGD dinner and I feel they have missed the entire point of Girl Geek Dinners and have also, with their comments, seriously undermined other women who are looking to come out of their shell and interact with other 'geeks'. If you don't agree with what we're doing then don't come to a Girl GEEK dinner, and certainly don't turn up and throw cold water on people, make belittling comments and then moan that it was too technical and you didn't enjoy it. So what is a geek? There seemed to be some confusion. These women throwing around the derogatory comments seem especially confused. So let's refresh everyones' minds. You don't need to be in IT to be a geek folks! It's not an exclusive club limited to women who don't baulk at the thought of writing code. We're a diverse crowd and we celebrate each others geekiness, even if it isn't something we're into. We certainly
Read more