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is primary key compulsary in clustering?
is primary key compulsary in clustering?
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vnj
vnj
Posted Friday, January 13, 2012 1:28 AM
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Last Login: Friday, June 29, 2012 1:55 AM
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Can we fing clusters of following data?
Id P1 P2
x 5.6 4.5
x 1.6 4.5
y 5.6 4.5
having 2 clusters?
Post #1235426
azdzn
azdzn
Posted Friday, January 13, 2012 1:45 AM
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Last Login: Tuesday, April 30, 2013 12:46 PM
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- your primary key hasn't to be your clustered index
- only one clustered index per table.
Post #1235429
PaulB-TheOneAndOnly
PaulB-TheOneAndOnly
Posted Monday, January 16, 2012 9:10 AM
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vnj (1/13/2012)
Can we fing clusters of following data?
Id P1 P2
x 5.6 4.5
x 1.6 4.5
y 5.6 4.5
having 2 clusters?
I think original poster is referring to "clusters" on its data mining meaning, as in "data clustering" as opposed to "clustered/non-clustered indexes".
Having said that, PKs are created to enforce uniqueness on a column or combination of columns, more related to referential integrity than to data mining - you can do "data clustering" in an indexless, PKless table.
_____________________________________
Pablo (Paul) Berzukov
Author of
Understanding Database Administration
available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
Post #1236676
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