code: public void setSizeRefsByMsgSize(boolean sizeByMsgSize)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "setSizeRefsByMsgSize", Boolean.valueOf(sizeByMsgSize));
  
          this._sizeRefsByMsgSize = sizeByMsgSize;
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "setSizeRefsByMsgSize");
      }
docs: PK57207 Called when adding this reference to a
  reference stream when to specify that
  sib.msgstore.jdbcSpillSizeRefsByMsgSize has been enabled