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]

KTFBFEBLKS Size of the extent in ORACLE blocks

本文转自maclean_007 51CTO博客，原文链接:
http://blog.51cto.com/maclean/1277820