How to make trace files visible to all users?

To make trace files visible to all users, set the parameter _TRACE_FILES_PUBLIC=TRUE, this is undocumented parameter. This parameter requires a restart of instance to take into effect. SQL> alter system set “_TRACE_FILES_PUBLIC”=true scope=spfile; System altered. Shows the trace file is accessible by all users, you may have change permissions on the user_dump_dest folder -rw-r–r– 1…