Oracle从执行计划的预估行数看执行计划是否正确
Tags： Oracle
从执行计划的预估行数可以看出执行计划是否正确，作为优化的你曾经注意到了么？
今天在监控系统垃圾sql语句的时候发现一个sql语句跑了10个小时了，凭直觉这个sql肯定哪里出现问题了，好吧，老规矩，先看看内存中执行计划和具体的sql语句吧，这里的sql语句：
INSERT /*+ append */ INTO CJG_MID_ACCT(ACCT,PARTY_NO,CHINESE_NAME,DATE_OPENED,RMB_CURRENT_BAL,BILL_DATE,RMB_CRLIM,AI_LAST,PSTL_CD,BIRTHDAY,GENDER,APPLICATION_NO,RMB_BLOCK_CODE_1,RMB_BLOCK_CODE_1_MEMO,RMB_BLOCK_CODE_2,RMB_BLOCK_CODE_2_MEMO,USD_CURRENT_BAL,USD_BLOCK_CODE_1,USD_BLOCK_CODE_1_MEMO,USD_BLOCK_CODE_2,USD_BLOCK_CODE_2_MEMO,DATE_ACTIVE,CURRENT_CARD_CNT,EDUCATION_DEGREE,INDUSTRY_TYPE,COMPANY_ATTRIBUTE,SALES_CODE,ANNUAL_INCOME,SOURCE_CODE,UTILIZATION_FLAG,CURRENT_FLAG,MOB,AGE,SFNAME,CITY,AI_FIRST) SELECT A.*,C.ACCT_ACTIVE_DATE AS DATE_ACTIVE, B.CURRENT_CARD_CNT,D.EDUCATION_DEGREE, D.INDUSTRY_TYPE,D.COMPANY_ATTRIBUTE,D.SALES_CODE,D.ANNUAL_INCOME,D.SOURCE_CODE, 'N' AS CURRENT_FLAG,'N' AS CURRENT_CURRENT_FLAG, TRUNC(MONTHS_BETWEEN(TO_DATE(SUBSTR(:B1 ,1,6),'yyyymm'),TO_DATE(SUBSTR(DATE_OPENED,1,6),'yyyymm')),0) AS MOB, FLOOR((TO_DATE(:B1 ,'yyyymmdd')-TO_DATE(A.BIRTHDAY,'yyyymmdd'))/365) AS AGE, NVL(E.SFNAME,'其他') AS SFNAME,NVL(E.QXNAME,'其他') AS CITY,D.AI AS AI_FIRST FROM TEMP_MID_ACCT_TMP02 A LEFT JOIN TEMP_MID_ACCT_CARDCNT B ON A.ACCT=B.ACCT LEFT JOIN TEMP_MID_ACCT_ACTIVED C ON A.ACCT=C.POST_TO_ACCT LEFT JOIN RISKREPT.RKO_CDM_PROCESS D ON A.APPLICATION_NO=D.APPLICATION_NO LEFT JOIN DIC_ZIP_CODE E ON SUBSTR(A.PSTL_CD,1,4)=E.ZIPCODE;
执行：SELECT *** FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR('djmga872c636s',0,'advanced')); 得到执行计划如下图：**
