x$ktfbue:kernel transaction, file bitmap used extent,used extent bitmap in file header for LMT (equivalent to uet$ in DMT); check dba_extents view definition,ktfb –space/spcmgmt support for bitmapped space manipulation of files/tablespaces
KTFBUE means K[Kernel] T[Transaction] F[File] B[Bitmap] U[Used] E[Extents]
SQL> desc x$ktfbue; Name Meaning ADDR N/A INDX N/A INST_ID N/A KTFBUESEGTSN ts# containing this segment KTFBUESEGFNO Relative number of the file containing the segment header KTFBUESEGBNO segment header block number KTFBUEEXTNO Extent number KTFBUEFNO Relative number of the file containing the extent KTFBUEBNO Starting block number of the extent KTFBUEBLKS Size of the extent in ORACLE blocks KTFBUECTM commit_jtime,Commit Time of the undo in the extent expressed as Julian date KTFBUESTT commit_wtime,Commit Time of the undo in the extent expressed as wall clock time KTFBUESTA Transaction Status of the undo in the extent;1, 'ACTIVE', 2, 'EXPIRED', 3, 'UNEXPIRED', 0 for non-undo-extent
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