Oracle Database Log Switch Intervals :

Hourly Log Switch breakdown :

SELECT * FROM (
SELECT * FROM (
SELECT   TO_CHAR(FIRST_TIME, 'DD/MM') AS "DAY"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '00', 1, 0)), '99') "00:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '01', 1, 0)), '99') "01:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '02', 1, 0)), '99') "02:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '03', 1, 0)), '99') "03:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '04', 1, 0)), '99') "04:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '05', 1, 0)), '99') "05:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '06', 1, 0)), '99') "06:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '07', 1, 0)), '99') "07:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '08', 1, 0)), '99') "08:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '09', 1, 0)), '99') "09:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '10', 1, 0)), '99') "10:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '11', 1, 0)), '99') "11:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '12', 1, 0)), '99') "12:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '13', 1, 0)), '99') "13:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '14', 1, 0)), '99') "14:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '15', 1, 0)), '99') "15:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '16', 1, 0)), '99') "16:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '17', 1, 0)), '99') "17:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '18', 1, 0)), '99') "18:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '19', 1, 0)), '99') "19:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '20', 1, 0)), '99') "20:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '21', 1, 0)), '99') "21:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '22', 1, 0)), '99') "22:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '23', 1, 0)), '99') "23:00"
    FROM V$LOG_HISTORY
    WHERE extract(year FROM FIRST_TIME) = extract(year FROM sysdate)
GROUP BY TO_CHAR(FIRST_TIME, 'DD/MM')
) ORDER BY TO_DATE(extract(year FROM sysdate) || DAY, 'YYYY DD/MM') DESC
) WHERE ROWNUM < 30
/

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