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Clustered Index Internals
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Clustered Index Internals
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Brandon Forest
Brandon Forest
Posted Tuesday, December 08, 2009 9:49 PM
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Group: General Forum Members
Last Login: Friday, May 17, 2013 11:29 AM
Points: 60,
Visits: 303
Comments posted to this topic are about the item
Clustered Index Internals
Post #831157
vk-kirov
vk-kirov
Posted Wednesday, December 09, 2009 12:43 AM
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Last Login: Today @ 12:59 AM
Points: 3,188,
Visits: 4,141
Terribly phrased options to choose.
A clustered index physically rearanges data on disk.
rea
rr
anges?
I think this option should look like this: "
When created or rebuilded
, a clustered index physically rearranges data on disk".
A quote from the explanation (and from the Delaney's book):
Once created, a clustered index is maintained
logically
rather than physically.
...
After that (after creation), maintaining the clustered index is a
logical
operation.
Another option from the question:
Dropping a rebuilding a clustered index on a partition scheme will move disk to other drives.
Maybe, "Dropping
and
rebuilding"?
"Move disk to other drives" – what is the meaning of this? Sounds like abracadabra for me
Maybe, it means "moving logical disks C:, D:, E: to other hard disk drives"?
Post #831200
Carlo Romagnano
Carlo Romagnano
Posted Wednesday, December 09, 2009 1:14 AM
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vk-kirov, I agree with you. Question and answer is incomprehensible!!!!
Post #831205
Toreador
Toreador
Posted Wednesday, December 09, 2009 2:19 AM
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"Dropping a rebuilding a clustered index on a partition scheme will move disk to other drives."
I have no idea what this means, and the answer doesn't seem to mention it.
Can someone explain please?!
Post #831219
jts_2003
jts_2003
Posted Wednesday, December 09, 2009 2:40 AM
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Group: General Forum Members
Last Login: Yesterday @ 3:53 PM
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This reminded me of something that has been puzzling me recently about clustered indexes. If the leaf level of a clustered index actually is the table's data itself, does this mean the table data only exists in the index, or is there another copy somewhere else?
e.g. if a table without a clustered index has one created, does all the table data get copied into the leaf level of the clustered index, or does it get 'moved'.
Post #831225
hakan.winther
hakan.winther
Posted Wednesday, December 09, 2009 2:49 AM
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Last Login: Monday, May 06, 2013 5:31 AM
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"Dropping a rebuilding a clustered index on a partition scheme will move disk to other drives."
Are you serious? What if I only have one disk (physical or logical (like in a SAN))? Where will it move? To Limbo or what?
I would say that the answer is wrong, becuase data will only be moved to other drives if the partition scheme uses a File group that is placed on another drive.
/Håkan Winther
MCITP:Database Developer 2008
Post #831232
ChiragNS
ChiragNS
Posted Wednesday, December 09, 2009 3:29 AM
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Group: General Forum Members
Last Login: Wednesday, April 24, 2013 5:02 AM
Points: 2,365,
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"Dropping a rebuilding a clustered index on a partition scheme will move disk to other drives." - Very confusing.
"Keep Trying"
Post #831256
Bhavesh_Patel
Bhavesh_Patel
Posted Wednesday, December 09, 2009 3:38 AM
SSChasing Mays
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Last Login: Friday, January 11, 2013 12:41 PM
Points: 621,
Visits: 297
the options where bit confusing
Bhavesh Patel
http://bhaveshgpatel.wordpress.com/
Post #831260
RichB
RichB
Posted Wednesday, December 09, 2009 3:55 AM
Ten Centuries
Group: General Forum Members
Last Login: Friday, May 17, 2013 8:59 AM
Points: 1,026,
Visits: 750
This last answer would make perfect sense if it was phrased as 'May' instead of 'Will'.
Poorly worded question - especially given how many of the questions on here are irritatingly pernickety about this type of pedantic points.
Post #831275
adrian.buzila
adrian.buzila
Posted Wednesday, December 09, 2009 4:43 AM
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Last Login: Friday, April 05, 2013 8:40 AM
Points: 907,
Visits: 173
This is false:
A clustered index physically rearanges data on disk.
Post #831291
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