Tuesday, August 16, 2011

Monitoring redo log switches

You can use the below query to find-out the number of redo log switches per hour in a day: -

select to_char(first_time,'DD-MON') day,  

sum(decode(to_char(first_time,'hh24'),'00',1,0)) "00",  
sum(decode(to_char(first_time,'hh24'),'01',1,0)) "01",  
sum(decode(to_char(first_time,'hh24'),'02',1,0)) "02",  
sum(decode(to_char(first_time,'hh24'),'03',1,0)) "03",  
sum(decode(to_char(first_time,'hh24'),'04',1,0)) "04",  
sum(decode(to_char(first_time,'hh24'),'05',1,0)) "05",  
sum(decode(to_char(first_time,'hh24'),'06',1,0)) "06",  
sum(decode(to_char(first_time,'hh24'),'07',1,0)) "07",  
sum(decode(to_char(first_time,'hh24'),'08',1,0)) "08",  
sum(decode(to_char(first_time,'hh24'),'09',1,0)) "09",  
sum(decode(to_char(first_time,'hh24'),'10',1,0)) "10",  
sum(decode(to_char(first_time,'hh24'),'11',1,0)) "11",  
sum(decode(to_char(first_time,'hh24'),'12',1,0)) "12",  
sum(decode(to_char(first_time,'hh24'),'13',1,0)) "13",  
sum(decode(to_char(first_time,'hh24'),'14',1,0)) "14",  
sum(decode(to_char(first_time,'hh24'),'15',1,0)) "15",  
sum(decode(to_char(first_time,'hh24'),'16',1,0)) "16",  
sum(decode(to_char(first_time,'hh24'),'17',1,0)) "17",  
sum(decode(to_char(first_time,'hh24'),'18',1,0)) "18",  
sum(decode(to_char(first_time,'hh24'),'19',1,0)) "19",  
sum(decode(to_char(first_time,'hh24'),'20',1,0)) "20",  
sum(decode(to_char(first_time,'hh24'),'21',1,0)) "21",  
sum(decode(to_char(first_time,'hh24'),'22',1,0)) "22",  
sum(decode(to_char(first_time,'hh24'),'23',1,0)) "23",  
count(to_char(first_time,'MM-DD')) Switches_per_day  
from v$log_history  
where trunc(first_time) between trunc(sysdate) - 6 and trunc(sysdate)  
group by to_char(first_time,'DD-MON')   
order by to_char(first_time,'DD-MON') ;  

Output would be like this : -



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