Querying the amount of redo in Oracle Database Posted on December 13, 2018 Standard Reply When a database starts to churn more redo then normal, it is handy to be able to extract the amount of redo over time, to be able to plot this on a graph. The below query allows you to extract this info 🙂 Query for redo generation Query to obtain the amount of redo generation over time by hour and MB: set pages 999 lines 400 select to_char(trunc(first_time, 'HH24'), 'DD/MM/YYYY HH24:MI:SS') date_by_hour, sum(round(blocks*block_size/1024/1024)) CHURN_IN_MB from v$archived_log group by trunc(first_time, 'HH24') order by 1 /

Query to obtain the amount of redo generation over time by hour and MB:

set pages 999 lines 400
select to_char(trunc(first_time, 'HH24'), 'DD/MM/YYYY HH24:MI:SS') date_by_hour, sum(round(blocks*block_size/1024/1024)) CHURN_IN_MB
from v$archived_log
group by trunc(first_time, 'HH24')
order by 1
/