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;
 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


  1. 不能详细点么

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