Search notes:

Oracle: X$KCCFN

select
   fn.addr,
   fn.indx,
   fn.inst_id,
   fn.con_id,
   fn.fnnum,
   fn.fntyp,     -- 4 = data file?
   fn.fnfno,     -- File number, join with sys.file$.file# or x$kcvfh.hxfil
   fn.fnfwd,
   fn.fnbwd,
   fn.fnflg,
   fn.fnnam,
   fn.fnonm,
   fn.fnbof,   -- Block size?
   fn.fnunn,
   fn.bytes
from
   x$kccfn fn;

See also

fixed table

Index