Hi Sylvain, Yes, async io is supported in 1159 / 9i . Its the DB feature and RHAS3.0 does support async io. init.ora parameter is disk_asynch_io . regards, santosh _____ From: ora-apps-dba-bounce@xxxxxxxxxxxxx [mailto:ora-apps-dba-bounce@xxxxxxxxxxxxx] Sent: Wednesday, October 25, 2006 18:30 To: ora-apps-dba@xxxxxxxxxxxxx Subject: ASYNCH IO + EBS11i Hi, We are running EBS11i 11.5.9 on linux RedHat AS 3.0 , and I 've just realized that ASYNCH IO are not enabled by default on our platform. Somebody knows if asynchronous IO is supported with E-Business 11i and Could tell me more about ( can we expect to increase performances ?) Thx, Sylvain Sylvain BRUNET (DOSI-Experts-DBA) Prestataire UNILOG - Logica CMG Consultant Technique