Thanks for your reply. I have checked in init.ora there were no parameter like _TRACE_FILES_PUBLIC has been set. More over oracle s/w have any special instructions or any background process while writing trace/alert log files to the unix folder, because I have noticed on some servers also, the trace files has been written to the disk with 640 permission only Regards, Naga On Tue, Dec 2, 2008 at 8:32 PM, Martin Berger <martin.a.berger@xxxxxxxxx>wrote: > Hi Naga, > you might want to check > _TRACE_FILES_PUBLIC > > best regards, > Martin > > -- > Martin Berger http://berx.at/ > > > > > I have clarification on file permissions written by oracle. I have an > oracle udump folder with 755 privilege, When i touched a file(test.sql) in > udump it created with 644 permission according to umask value.But when > oracle db generated trace files or alert logs it has been created with 640 > permission. Please clear my doubt how it is possible > > > >