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Message Posted: Mon, 05 Mar 2007 @ 15:11:41 GMT
Can anyone please let me know if there is any way to improve the performance of a self join of large table? The size of this table is around 150 million records.
My query is something of this sort.
Select A.* ,value 1/ sum(value 2) over (partition by dim1, dim2, dim3, dim3 ) from ( select dim1, dim2, dim3, metric 1/ metric 2 as value 2 from A group by 1,2,3 ) B where A.dim1 = B.dim1 and A.dim2 = B.dim2 and A.dim3 = B.dim3
I am using a self join on table A with an OLAP function partition by. The performance is poor and looks like olap functions are not as fast they are supposed to be.
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