刚刚监控到一条SQL占用了大量的I/O，SQL如下： SELECT ORD_ID, UNT_PRD_ID, ORD_QTY, STKO_WH_NO, ORD_WH_NO, ORD_MDA_CD, STOCK_MDA_CD from (SELECT ORD_ID, UNT_PRD_ID, SUM(ORD_QTY) ORD_QTY, STKO_WH_NO, ...