Archives of the TeradataForum
Message Posted: Thu, 18 Dec 2003 @ 19:36:50 GMT
I have a table called Table_x and it has 20 columns and 10 K rows. I have another table called Table_y and it has 7 columns and 10 Million rows. The Unique Primary index on Table_x is its column-1 and that is exactly the column-1 in Table-y. The unique primary Index of Table-y is its columns 1, 2, and 3. Columns 2,3 of Table-y not exists in Table-x.
In this case, the Load performance is the best and the skew factor in Table-y is 0.
The query performance is the worst in the above case when I join Table-x to Table-y. Then I changed the Unique Primary Index of Table-y to just Primary Index on column-1.
The query performance is the best in this case, but the load performance affected severely. The skew factor now is 22.
Could anybody who did this type of installation give me a better solution?
Many thanks in advance
|Copyright 2016 - All Rights Reserved|
|Last Modified: 23 Jun 2019|