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 ...
I have a large table, the row count of the table is more than 3 billion, the data space for this table is about 120 GB. And Intel Xeon CPU E5645 @2.4GHz(2 processors), 24 CPUs, 64G memory, 64bit ...
We're using a proprietary application based on SQL Server 2005, which has many HEAP based tables (that is, no Clustered index). Over the years, these tables have grown badly fragmented (e.g. 99% ...
Say I have a table clustered on PrimaryKey, and in all cases I want my results to be ordered by PrimaryKey so I additionally always ORDER BY PrimaryKey in all queries. Does this ORDER BY affect ...
I have a SQL statement that inserts rows into a table with a clustered index on the column TRACKING_NUMBER. E.G.: INSERT INTO TABL_NAME (TRACKING_NUMBER, COLB, COLC) SELECT TRACKING_NUMBER, COL_B, ...
I have a table with field Id (bigint, IDENTITY) as primary key and clustered index on it. I inserted 400 rows and saw execution plan. I got: the relative query cost for this insertion 36% and for this ...
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 ...