这篇文章主要介绍了Oracle如何查询最近几天每小时归档日志产生数量，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

脚本如下所示：

SELECTSUBSTR(TO_CHAR(first_time,'MM/DD/RRHH:MI:SS'),1,5)Day,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'00',1,0))H00,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'01',1,0))H01,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'02',1,0))H02,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'03',1,0))H03,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'04',1,0))H04,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'05',1,0))H05,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'06',1,0))H06,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'07',1,0))H07,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'08',1,0))H08,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'09',1,0))H09,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'10',1,0))H10,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'11',1,0))H11,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'12',1,0))H12,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'13',1,0))H13,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'14',1,0))H14,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'15',1,0))H15,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'16',1,0))H16,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'17',1,0))H17,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'18',1,0))H18,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'19',1,0))H19,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'20',1,0))H20,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'21',1,0))H21,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'22',1,0))H22,SUM(DECODE(SUBSTR(TO_CHAR(first_time,'MM/DD/RRHH24:MI:SS'),10,2),'23',1,0))H23,COUNT(*)TOTALFROMv$log_historyaWHEREfirst_time>=to_char(sysdate-10)GROUPBYSUBSTR(TO_CHAR(first_time,'MM/DD/RRHH:MI:SS'),1,5)ORDERBYSUBSTR(TO_CHAR(first_time,'MM/DD/RRHH:MI:SS'),1,5)DESC;

修改天数，可以修改WHERE first_time>=to_char(sysdate-11)

执行结果

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