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Sparse Columns
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Sparse Columns
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Saurabh Dwivedy
Saurabh Dwivedy
Posted Thursday, March 04, 2010 8:32 PM
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Comments posted to this topic are about the item
Sparse Columns
Saurabh Dwivedy
___________________________________________________________
My Blog:
http://tinyurl.com/dwivedys
For better, quicker answers, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537
Be Happy!
Post #877349
bitbucket-25253
bitbucket-25253
Posted Thursday, March 04, 2010 9:48 PM
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Good question .... learned something from it ...
Thanks
If everything seems to be going well, you have obviously overlooked something.
Ron
Please help us, help you -before posting a question please
read
Before posting a performance problem please
read
Post #877361
SQLRNNR
SQLRNNR
Posted Thursday, March 04, 2010 10:10 PM
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Thanks Saurabh, I learned something about sparse columns today.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #877369
jshailendra
jshailendra
Posted Friday, March 05, 2010 12:13 AM
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Good question....learnt from it...tnx
Post #877427
keyur.patel
keyur.patel
Posted Friday, March 05, 2010 12:25 AM
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I can get clear idea for this.
Thanks,
Keyur Patel
Post #877432
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Friday, March 05, 2010 12:25 AM
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Nice question about a seldom-used part of SQL Server.
Learned something new myself.
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #877433
ziangij
ziangij
Posted Friday, March 05, 2010 3:50 AM
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sorry for sounding stupid, but has anybody implemented sparse in his/her code ?
what was the reasoning behind.. is it really worth ?
Post #877511
Cliff Jones
Cliff Jones
Posted Friday, March 05, 2010 7:52 AM
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This is good information. Thanks for the question.
Post #877657
Jamie Longstreet-481950
Jamie Longstreet-481950
Posted Friday, March 05, 2010 9:22 AM
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Guess I am a bit confused by the question
A sparse column must be nullable and cannot have the ROWGUIDCOL or IDENTITY properties. A sparse column cannot be of the following data types: text, ntext, image, timestamp, user-defined data type, geometry, or geography; or have the FILESTREAM attribute.
I'm not sure how something is "defined on them", it may have had a meaning different than the one I read into it. It is clear that a Sparse Column cannot have a Filestream attribute.
There have been times in the past when my sparse sql skills prompted me to look at a Union statement when trying to compare two values that would have best been seen in a left join. The sparse column would have come in handy. It is a good topic. I wonder if we can just reword it slightly... maybe "Can a sparse column have a FileStream Attibute?"
Jamie
Post #877739
Oleg Netchaev
Oleg Netchaev
Posted Friday, March 05, 2010 7:04 PM
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ziangij (3/5/2010)
sorry for sounding stupid, but has anybody implemented sparse in his/her code ?
what was the reasoning behind.. is it really worth ?
Implementation of the sparse column makes sense only if the data in the column is, well, sparse. This is because it takes more space to store not null values in the sparse columns. For example, character types, such as char and varchar need twice as many bytes to store not null data if the column is defined as sparse. For those types only if 60% or more of all records are nulls then it makes sense to define the respective columns as sparse. For example, many databases storing consumer/customer/person records might end up having a column storing data for so-called
address line 2
which will not have any data in the majority of records, which makes such column a good candidate to be defined as sparse.
Oleg
Post #878045
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