redo切換頻率查詢

raysuen發表於2016-12-23
SELECT 
to_char(first_time,'YYYY-MM-DD') day,   
to_char(sum(decode(to_char(first_time,'HH24'),'00',1,0)),'999') "00",   
to_char(sum(decode(to_char(first_time,'HH24'),'01',1,0)),'999') "01",   
to_char(sum(decode(to_char(first_time,'HH24'),'02',1,0)),'999') "02",   
to_char(sum(decode(to_char(first_time,'HH24'),'03',1,0)),'999') "03",   
to_char(sum(decode(to_char(first_time,'HH24'),'04',1,0)),'999') "04",   
to_char(sum(decode(to_char(first_time,'HH24'),'05',1,0)),'999') "05",   
to_char(sum(decode(to_char(first_time,'HH24'),'06',1,0)),'999') "06",   
to_char(sum(decode(to_char(first_time,'HH24'),'07',1,0)),'999') "07",   
to_char(sum(decode(to_char(first_time,'HH24'),'08',1,0)),'999') "08",   
to_char(sum(decode(to_char(first_time,'HH24'),'09',1,0)),'999') "09",   
to_char(sum(decode(to_char(first_time,'HH24'),'10',1,0)),'999') "10",   
to_char(sum(decode(to_char(first_time,'HH24'),'11',1,0)),'999') "11",   
to_char(sum(decode(to_char(first_time,'HH24'),'12',1,0)),'999') "12",   
to_char(sum(decode(to_char(first_time,'HH24'),'13',1,0)),'999') "13",   
to_char(sum(decode(to_char(first_time,'HH24'),'14',1,0)),'999') "14",   
to_char(sum(decode(to_char(first_time,'HH24'),'15',1,0)),'999') "15",   
to_char(sum(decode(to_char(first_time,'HH24'),'16',1,0)),'999') "16",   
to_char(sum(decode(to_char(first_time,'HH24'),'17',1,0)),'999') "17",   
to_char(sum(decode(to_char(first_time,'HH24'),'18',1,0)),'999') "18",   
to_char(sum(decode(to_char(first_time,'HH24'),'19',1,0)),'999') "19",   
to_char(sum(decode(to_char(first_time,'HH24'),'20',1,0)),'999') "20",   
to_char(sum(decode(to_char(first_time,'HH24'),'21',1,0)),'999') "21",   
to_char(sum(decode(to_char(first_time,'HH24'),'22',1,0)),'999') "22",   
to_char(sum(decode(to_char(first_time,'HH24'),'23',1,0)),'999') "23" 
from 
   v$log_history   
GROUP by 
   to_char(first_time,'YYYY-MM-DD') order by day desc;

來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/28572479/viewspace-2131281/,如需轉載,請註明出處,否則將追究法律責任。

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