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Indexing


Indexing

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Steve Jones
Steve Jones
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Group: Administrators
Points: 401791 Visits: 20456
A request from a user:
==
I second the request for more articles on indexing! As junior-ish DBA to a new company (and the only real DBA), I had to evaluate various performance bottlenecks fairly quickly. Turns out that indexing was a major issue, with the most important table having over 55 indexes, and the top 10 tables having over 20 indexes each. I really could not find any solid information on how to begin to attack this problem - each article I came across gave me only bits and pieces of the puzzle. Specifically, which metrics to look at when evaluating, tuning existing indexes, and how to choose which ones to kill. I was eventually able to come up with a game plan, but something comprehensive might help someone else in the future!
==

I think there's room for a few articles here, tackling this from new angles.

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David Fundakowski
David Fundakowski
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Group: General Forum Members
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I would like to write an article for this. I recently had to address a real world issue regarding latching and blocking that was caused by parallelism resulting from poor indexing on tables. Things that would be covered in this article:
-Index scans vs seeking
-MaxDOP/Threads/Parallelism
-Wait Statistics
-Graphical execution plans in SSMS
-DMV's to find cached sprocs using specific indexes, amount of times a sproc executed
-DMV's to find indexes on tables, how many times indexes are utilized in execution plans, and seeks/updates/scans per index

The items listed above would be covered in respect to ID'ing parallelism, diagnosing it as the bottleneck, and remedying it with indexes.

Thanks

David Fundakowski
Steve Jones
Steve Jones
SSC Guru
SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)SSC Guru (401K reputation)

Group: Administrators
Points: 401791 Visits: 20456
Love to see it. Focus down on your problem, not generally how other systems might work. IF you can mock your situation, and process for solving, that's a great learning piece.

Follow me on Twitter: @way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
My Blog: www.voiceofthedba.com
David Fundakowski
David Fundakowski
Right there with Babe
Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)Right there with Babe (760 reputation)

Group: General Forum Members
Points: 760 Visits: 536
I have sent a PM with the article.
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