REDO LOG SWITCH FREQUENCY SCRIPT

Redo log switch frequency script to get high redo activity per hour



col Day form a3
col h0 format 99
col h1 format 99
col h2 format 99
col h3 format 99
col h4 format 99
col h5 format 999
col h6 format 999
col h7 format 999
col h8 format 999
col h9 format 999
col h10 format 999
col h11 format 999
col h12 format 999
col h13 format 999
col h14 format 999
col h15 format 999
col h16 format 999
col h17 format 999
col h18 format 999
col h19 format 999
col h20 format 999
col h21 format 999
col h22 format 999
col h23 format 999
select to_char(first_time,'DY') as DAY,
sum(case to_char(FIRST_TIME,'hh24') when '00' then 1 else 0 end ) as h0,
sum(case to_char(FIRST_TIME,'hh24') when '01' then 1 else 0 end ) as h1,
sum(case to_char(FIRST_TIME,'hh24') when '02' then 1 else 0 end) as h2,
sum(case to_char(FIRST_TIME,'hh24') when '03' then 1 else 0 end) as h3,
sum(case to_char(FIRST_TIME,'hh24') when '04' then 1 else 0 end) as h4,
sum(case to_char(FIRST_TIME,'hh24') when '05' then 1 else 0 end) as h5,
sum(case to_char(FIRST_TIME,'hh24') when '06' then 1 else 0 end) as h6,
sum(case to_char(FIRST_TIME,'hh24') when '07' then 1 else 0 end) as h7,
sum(case to_char(FIRST_TIME,'hh24') when '08' then 1 else 0 end) as h8,
sum(case to_char(FIRST_TIME,'hh24') when '09' then 1 else 0 end) as h9,
sum(case to_char(FIRST_TIME,'hh24') when '10' then 1 else 0 end) as h10,
sum(case to_char(FIRST_TIME,'hh24') when '11' then 1 else 0 end) as h11,
sum(case to_char(FIRST_TIME,'hh24') when '12' then 1 else 0 end) as h12,
sum(case to_char(FIRST_TIME,'hh24') when '13' then 1 else 0 end) as h13,
sum(case to_char(FIRST_TIME,'hh24') when '14' then 1 else 0 end) as h14,
sum(case to_char(FIRST_TIME,'hh24') when '15' then 1 else 0 end) as h15,
sum(case to_char(FIRST_TIME,'hh24') when '16' then 1 else 0 end) as h16,
sum(case to_char(FIRST_TIME,'hh24') when '17' then 1 else 0 end) as h17,
sum(case to_char(FIRST_TIME,'hh24') when '18' then 1 else 0 end) as h18,
sum(case to_char(FIRST_TIME,'hh24') when '19' then 1 else 0 end) as h19,
sum(case to_char(FIRST_TIME,'hh24') when '20' then 1 else 0 end) as h20,
sum(case to_char(FIRST_TIME,'hh24') when '21' then 1 else 0 end) as h21,
sum(case to_char(FIRST_TIME,'hh24') when '22' then 1 else 0 end) as h22,
sum(case to_char(FIRST_TIME,'hh24') when '23' then 1 else 0 end) as h23
from v$log_history
group by to_char(first_time,'DY')
order by case to_char(first_time,'DY')
when 'SUN' then 0
when 'MON' then 1
when 'TUE' then 2
when 'WED' then 3
when 'THU' then 4
when 'FRI' then 5
when 'SAT' then 6
end ASC;

Output:

DAY  H0  H1  H2  H3  H4   H5   H6   H7   H8   H9  H10  H11  H12  H13  H14  H15  H16  H17  H18  H19  H20  H21  H22  H23
--- --- --- --- --- --- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
SUN   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    3    0    0    0    0    0    0    3    0
MON   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    3    0    4    3   11    0    9   20   90
TUE  21   0   0   0   0    0    0    0    0    0    0    0    0    0    0    2    0   11    0    2    1    0   11    4
WED   1   0   0   0   0    0    0    0    0    0    0    0    0    1    0   10    3    0    0    3    1    0    6    0
THU   0   0   0   0   0    0    0    0    0    0    0    0    3    3    1    0    5    0    0    7    2    1    8   15
FRI   0   0   0   0   0    0    0    0    0    0    0    0    0    3    3    0    0    0    0    0    0    0    8    0
SAT   0   0   0   0   0    0    0    0    0    0    0    0    0    0    0    0    3    3    0    0    1    0    2    1

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