x$ktfbue:kernel transaction, file bitmap free extents,Free extent bitmap in file header for LMT (equivalent to fet$ in DMT); check dba_free_space view definition,ktfb –space/spcmgmt support for bitmapped space manipulation of files/tablespaces
KTFBFE means K[Kernel] T[Transaction] F[File] B[Bitmap] F[Free] E[Extents]
SQL> desc x$ktfbfe; Name ----------------------------------------- ADDR N/A INDX N/A INST_ID N/A KTFBFETSN TS# containing this free extent KTFBFEFNO Relative number of the file containing the free extent KTFBFEBNO Starting block number of the free extent KTFBFEBLKS Size of the extent in ORACLE blocks
不能详细点么