The Ultimate Index Lister (Non-Pivoted)

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The Ultimate Index Lister (Non-Pivoted)

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YeshuaAgapao

Posted Sunday, August 03, 2008 9:18 PM

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Comments posted to this topic are about the item The Ultimate Index Lister (Non-Pivoted)

Post #545864

wchaster

Posted Tuesday, October 07, 2008 9:17 AM

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Where does this SP need to be created, I created it in Master and it only returns result from the dbo or sys schema's.

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Post #581910

YeshuaAgapao

Posted Tuesday, October 07, 2008 10:22 AM

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You need to place it in the database you need to get results for. Had to make it that way to be sure to be able to get table names.

Post #581975

Manie Verster

Posted Friday, October 10, 2008 2:16 AM

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Great article! This came at just the right time for me! I was trying to do exactly this but got stuck but now, thanks to you!, I don't need to battle anymore. I have one question. I am trying to understand exactly what indexes are and what impact they can have on the database and yes, I think I have that but what I don't quite get is the Included Columns. What impact can they have on a table or the database as a whole? I have, with the help of your sp, identified a table of which the indexes looks cosher but one index have nearly all of the table's columns as included columns. Is this right?

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Post #583805

YeshuaAgapao

Posted Friday, October 10, 2008 10:47 AM

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Included columns are available only to cover to query (prevent bookmark lookups), but not for seeks. Included columns can assist in exploiting the fact that clustered indexes append its key as seeks (non-unique indexes; it appends as includes for unique indexes) at the end by limiting columns only needed to prevent bookmark lookups to the leaf level. I have several indexes with one or two seek columns and 3+ include columns (for covering the query) that rely on the clustered index key for 3rd or 4th seek columns. If these 'cover the query' only columns were seeks, it would ruin clustered index exploitation for additional seek columns.

Post #584132

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