2
votes
1answer
60 views

Clustered Index / Index Oriented Table performance in join, worse than nonclustered?

Can a clustered index (or IOT in Oracle) be detrimental, when to be used on a very "broad" table, but only few columns are used? In this case, the "Product" table is used only like a junction table ...
1
vote
0answers
115 views

Why does removing a RID by creating a clustered index lose parallelism and slow down execution by 2X

If I remove a RID lookup by replacing 2 non-clustered indices (non unique) with 2 identical clustered indicies (non-unique) where there weren't any before, why does this query slow down by a factor ...
4
votes
2answers
130 views

If I update a column record in a table, will indexes that do NOT have this column in it be affected?

In terms of performance if I have a table like so: CREATE TABLE [TESTDATA].[TableA]( [Col1] [nchar](5) NOT NULL, [Col2] [nchar](2) NULL, [Col3] [float] NULL CONSTRAINT [TableA_PK] PRIMARY ...