A type of index mostly used in SQL-Server, which aligns the data of a table with the index.
15
votes
4answers
993 views
Is 'Avoid creating a clustered index based on an incrementing key' a myth from SQL Server 2000 days?
Our databases consist of lots of tables, most of them using an integer surrogate key as a primary key. About half of these primary keys are on identity columns.
The database development started in ...
9
votes
2answers
5k views
What is a Clustered Index?
I need a short explaining of clustered index.
What is a clustered index?
What are best practices for using the clustered index?
4
votes
1answer
268 views
Storage order vs Result order
This is a spin-off question from Sort order specified in primary key, yet sorting is executed on SELECT.
@Catcall says this on the subject of storage order (clustered index) and the output order
...
11
votes
2answers
803 views
Is there any tangible difference between a unique clustered index and a clustered primary key?
I understand that there may be a difference in meaning or intent between the two, but are there any behavioral or performance differences between a clustered primary key and a clustered unique index?
7
votes
1answer
371 views
What factors go into an Indexed View's Clustered Index being selected?
Breifly
What factors go into they query optimizer's selection of an indexed view's index?
For me, indexed views seem to defy what I understand about how the Optimizer picks indexes. I've seen this ...
5
votes
2answers
752 views
Why index REBUILD does not reduce index fragmentatation?
I have used ALTER INDEX REBUILD to remove index fragmentation. In some cases REBUILD does not seem to remove this fragmentation. What are the reasons why REBUILD does not remove fragmentation? It ...
3
votes
0answers
205 views
Why are runtimes different for a table including a primary key versus a table with a clustered unique index added after population
When I create a temporary table with a PK defined from the outset like this I get great performance in subsequent joins on that key:
create table #temp (
field1 int not null
field2 int ...
7
votes
1answer
1k views
noexpand hint for non-enterpise edition and performance
I have to use Indexed views to reach performance. As I can see from this comparison table standard edition does not support indexed views. But BOL says:
Indexed views can be created in any
...
4
votes
2answers
130 views
Need for reaching data through clustered index with a non-clustered index
I have found that when a table has both clustered and non-clustered indexes (on different columns), the leaf level non-clustered pages, instead of pointing to the data row, point to the node of the ...
