Jakub, Thanks for your reply. The max of blob size is 1M and the average is 0.2M. Both initial and next extents are 1M. Our chunk size is 8K.David From: Jakub.Jalovec@xxxxxxxxxxxxxxxxx: davidb158@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxxxxxx: Thu, 7 Jun 2007 19:00:03 +0200Subject: RE: insert blob slow in 10g David, try to play with storage parameters of the LOB column - initial and next extent - enable/disale storage in row - chunk size What is average blob size? Cache helped me as well. it's old but useful http://www.oracle.com/technology/products/database/application_development/pdf/lob_performance_guidelines.pdf Jakub _________________________________________________________________ Make every IM count. Download Windows Live Messenger and join the i’m Initiative now. It’s free. http://im.live.com/messenger/im/home/?source=TAGWL_June07