In every 1 month i did data refresh from production to quality .......Offline Backup take 4 hour (data size 380 GB) database db2 9.7 fp5....and once i put for restore it always takes 20 hours to restore ....what may be the problem.
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this is very difficult to say with limited information.
Maybe start of by checking the network speed to the quality system, you could check the disks,