code: void becomeActive()
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "becomeActive", this);
  
          _logFileHeader.changeStatus(LogFileHeader.STATUS_ACTIVE);
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "becomeActive");
      }
docs: Called by the controlling logic to inform this file handle that it represents
  a brand new file that has been selected to recieve the first data written to
  the log. This method will only be called during a cold start when there are
  no existing log files available for recovery. Both file handles that make up
  the log have been pre-set to INACTIVE state and this method is used to set
  one (and only one) to ACTIVE state.