Need suggestions for imporving data load performance via SQL Loader

Hi,
Our requirement is to load 512 (1 GB each) files in Oracle database.
We are using SQL loaders to load files into the DB (A partitioned table) and have tried almost all the possible options that come with sql loaders (Direct load path, parallel=true, multithreading=true, unrecoverable)
As the tables is growing bigger in size, each file load time is increasing (It started with 5 minutes per file and has reached 2 hours per 3 files now and is increasing with every batch- Note we are loading 3 files concurrently on the target table using the parallel = true oprion of sql loader)
Questions 1:
My problem is that somehow multithreading is not working for us (we have multi CPU server and have enabled multithreading=true). Could it be something to do with DB setting which might be hindering the data load to be done in multiple threads?
Question 2:
Would gathering stats on the target table and it's partitions help improve load performance ? I'm not sure if stats improve DML's, they would definitely improve sql queries. Any thoughts?
Question 3:
What would be the best strategy to gather stats on this table (which would end up having 512 GB data) ?
Question 4:
Do you think insertions in a partitioned table (with growing sizes) would have poor performance as compared to a non-partitioned table ?
Any other suggestions to improve performace are most welcome !!
Thanks,
Sachin
Edited by: Sachin Tiwari on Mar 13, 2013 6:29 AM

2 hours to load just 3 GB of data seems unreasonable regardless of the SQL Loader settings. It seems likely to me that the problem is not with SQL Loader but somewhere else.
Have you generated a Statspack/ AWR/ ASH report to see where all that time is being spent? Are there triggers on the table? Are there bitmap indexes?
Is your table partitioned in a way that is designed to improve the efficiency of loads so that all the data from one file goes into one partition? Or is data from each file getting inserted into many different partitions.
Justin

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Regards,
Venkat

Need suggestions for imporving data load performance via SQL Loader

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