Secondary XML Indexes

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Secondary XML Indexes

Steve Jones - SSC Editor

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March 13, 2015 at 12:13 am

#74424

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March 13, 2015 at 3:48 am

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Koen Verbeeck SSC Guru Points: 259115 More actions · Answer 1

Nice question, thanks.

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Ed Wagner SSC Guru Points: 287026 More actions · Answer 2

I must admit that I don't use XML very much. It's does store very flexible data structure, but it just doesn't perform well. Thanks for the question.

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SqlMel SSCrazy Points: 2901 More actions · Answer 3

Thanks for the question, Steve.

---------------
Mel. 😎

RK Mandava SSCarpal Tunnel Points: 4153 More actions · Answer 4

RK Mandava

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March 13, 2015 at 7:23 am

#1783854

Nice question, thanks

Revenant SSC-Forever Points: 42467 More actions · Answer 5

Revenant

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Points: 42467

March 13, 2015 at 9:22 am

#1783926

Simple and nice. Thanks, Steve!

TomThomson SSC Guru Points: 104773 More actions · Answer 6

Nice and simple. But I avoid XML like the plague.

Tom

Jeff Moden SSC Guru Points: 1004378 More actions · Answer 7

Ed Wagner (3/13/2015)
I must admit that I don't use XML very much. It's does store very flexible data structure, but it just doesn't perform well. Thanks for the question.

TomThomson (3/14/2015)
Nice and simple. But I avoid XML like the plague.

Heh... ditto those especially Tom's. A better question would be why would anyone in their right mind store XML in a database ever?

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TomThomson SSC Guru Points: 104773 More actions · Answer 8

Jeff Moden (3/14/2015)
Ed Wagner (3/13/2015)
I must admit that I don't use XML very much. It's does store very flexible data structure, but it just doesn't perform well. Thanks for the question.
TomThomson (3/14/2015)
Nice and simple. But I avoid XML like the plague.
Heh... ditto those especially Tom's. A better question would be why would anyone in their right mind store XML in a database ever?

Actually there can be good reasons to store XML in a database - just as there can be reasons to store text strings. I imagine that Neos Interactive is now storing XAML in SQL Server databases, because the Beirut team was heading that way (with encouragement from me) when I handed over all tecnical responsability to them - not that the database will be looking into the XAML, I hope, just holding it and delivering it when the presentation layer wants something like "the string used for the XYX field in the UVW screen of the RST GUI in the OPQ language as spoken in LMN coutry/region". Of course the XAML fields will be held as NVARCHAR(3600) and the database will not be aware that these fields contain values in an XML-based language, and although XML is OK when used appropriately (in this instance as part of a GUI implementation using WPF) there can be no excuse for having any XML indexes or being able to treat XML within the database as anything other than an atomic string attribute with no internal structure. We were using NVARCHAR(3600) strings of text in English, French, German, two varieties of Chinese, and Russian up to 2009 but decided to upgrade to using WPF (and hence XAML) at the same time as upgrading from SQL Server 2000 to 2008 (or 2008 R2).

Tom

Hany Helmy SSChampion Points: 13921 More actions · Answer 9

Ed Wagner (3/13/2015)
I must admit that I don't use XML very much. It's does store very flexible data structure, but it just doesn't perform well. Thanks for the question.

+ 1 🙂

Thanks & Best Regards,
Hany Helmy
SQL Server Database Consultant