ITL flag的含义



ITL flag的含义

        . Flags :
                . C : transaction has finished (committed) (set during a cleanout).   ==》commit


                . B : the field  UBA points to the undo operation of the modification made
                                    to the ITL itself (in the case of an index split)     ==> UBA point to UBA of ITL


                . U : associated with the flag C: the SCN is not exact, it is an upper estimate.  ==> commit with UpperBound Scn

                . T : the transaction was active during the last cleanout.
                       (only in the case of cleanout in mode CR