Making trace files available

There is an undocumented parameter _trace_files_public that if set to true changes the file permissions in the user_dump_dest directory when trace files are created to allow everyone to read them. This parameter can be checked with the following SQL. You can set this parameter by adding the following line to the init.ora file:
# allow trace files to be created with public permissions
_trace_files_public=true
SQL to check the value of this parameter:
SQL> select x.ksppinm name,y.ksppstvl value
from sys.x$ksppi x,sys.x$ksppcv y
where x.inst_id=userenv('Instance')
and y.inst_id=userenv('Instance')
and x.indx=y.indx
and x.ksppinm='_trace_files_public';