Performance problem with the bulk data

Hi,
I have created the mapping to load the fact table and succesfully deployed.
When i tried to do the Initial load with the 12 million records,it is taking arround 90 hours.
To reduce this time ,what performance measures we can take.
Following is the little brief about the fact table.
I am doing the outer join of two source tables.While loading the fact table ,i am doing a lookup into 4 dimension tables.For two dimension tables i am passing 17 fields to get the keys.We dont have indexes on the sources.
I would be thankful if you can help me out.
Thanks
Vinay

Hi Jean,
One point,i have not mentioned correctly.I am giving below the the answers to your questions again.
1.I am using SET based fail over to row based.
2.Yes,i can expect a decent load times on the unix.
3.I am not loading in parallel inserts.
4.Yes, i am disabling the constraints/indexes on the fact table when loading.
5.On the execution plan of the query, the joins being done are using NESTED_LOOPS and HASH_JOINS?
6.There is only one not null key in the 2 dimension table.To get this key , i am passing 17 fields from the source tables.I dont have the primary key/Foriegn key references betweeen the fact table and the dimension tables.
Hope i have given the complete information to you.
Thanks
Vinay

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