Comments on: Overhead in Non-Unique Clustered Indexes http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/ Adventures in SQL Tuning - a blog for the rest of us Thu, 04 Feb 2010 08:21:02 -0700 http://wordpress.org/?v=2.9.1 hourly 1 By: Undocumented Function in SQL 2008 : SQL Fool http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/comment-page-1/#comment-4923 Undocumented Function in SQL 2008 : SQL Fool Wed, 02 Sep 2009 01:39:57 +0000 http://sqlfool.com/?p=961#comment-4923 [...] by rolling up your sleeves and getting into the nitty-gritty of data pages (i.e. see my post on Overhead in Non-Unique Clustered Indexes). So imagine how happy I was when my co-worker Jeff shared an undocumented function with me today [...] [...] by rolling up your sleeves and getting into the nitty-gritty of data pages (i.e. see my post on Overhead in Non-Unique Clustered Indexes). So imagine how happy I was when my co-worker Jeff shared an undocumented function with me today [...]

]]> By: Rob Boek http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/comment-page-1/#comment-3987 Rob Boek Sun, 24 May 2009 20:29:49 +0000 http://sqlfool.com/?p=961#comment-3987 Great post. Thanks! Great post. Thanks!

]]> By: Log Buffer #147: a Carnival of the Vanities for DBAs | Pythian Group Blog http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/comment-page-1/#comment-3899 Log Buffer #147: a Carnival of the Vanities for DBAs | Pythian Group Blog Fri, 22 May 2009 16:54:17 +0000 http://sqlfool.com/?p=961#comment-3899 [...] Ufford, the SQL Fool, covers overhead in non-unique clustered indexes, giving a walk-through of scenarios in which the DBA will encounter [...] [...] Ufford, the SQL Fool, covers overhead in non-unique clustered indexes, giving a walk-through of scenarios in which the DBA will encounter [...]

]]> By: Jack Corbett http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/comment-page-1/#comment-3898 Jack Corbett Fri, 22 May 2009 16:06:41 +0000 http://sqlfool.com/?p=961#comment-3898 Great post clearly explaining how clustered indexes work. Great post clearly explaining how clustered indexes work.

]]> By: Paul Randal http://sqlfool.com/2009/05/overhead-i-non-unique-clustered-indexes/comment-page-1/#comment-3840 Paul Randal Thu, 21 May 2009 14:17:42 +0000 http://sqlfool.com/?p=961#comment-3840 Hey Michelle, Actually in the case where there's no duplicate in the non-unique clustered index, the UNIQUIFIER column is actually NULL, not 0 - otherwise it would have to take up space in the record. When I wrote DBCC PAGE, I decided to dump it out as a zero, to make more sense in the progression of UNIQUIFIER values when there are duplicates. Thanks Hey Michelle,

Actually in the case where there’s no duplicate in the non-unique clustered index, the UNIQUIFIER column is actually NULL, not 0 – otherwise it would have to take up space in the record. When I wrote DBCC PAGE, I decided to dump it out as a zero, to make more sense in the progression of UNIQUIFIER values when there are duplicates.

Thanks

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