diff --git a/redolog_freq_switch.sql b/redolog_freq_switch.sql
new file mode 100644
index 0000000..c77080b
--- /dev/null
+++ b/redolog_freq_switch.sql
@@ -0,0 +1,71 @@
+--
+--  affichage de la rotation des redelog par jour et par heure
+--
+
+set head off
+select max('Taille des fichiers redolog (Mo) : ' || bytes/1024/1024) from v$log;
+
+set head on
+set pages 999 lines 200
+col Date for a12
+col Total for 9999
+col 00 for 999
+col 01 for 999
+col 02 for 999
+col 03 for 999
+col 04 for 999
+col 05 for 999
+col 06 for 999
+col 07 for 999
+col 08 for 999
+col 09 for 999
+col 10 for 999
+col 11 for 999
+col 12 for 999
+col 13 for 999
+col 14 for 999
+col 15 for 999
+col 16 for 999
+col 17 for 999
+col 18 for 999
+col 19 for 999
+col 20 for 999
+col 21 for 999
+col 22 for 999
+col 23 for 999
+col 24 for 999
+
+
+select to_char(first_time, 'YYYY/MM/dd') "Date",
+count(1) "Total",
+sum(decode(to_char(first_time, 'hh24'),'00',1,0)) "00",
+sum(decode(to_char(first_time, 'hh24'),'01',1,0)) "01",
+sum(decode(to_char(first_time, 'hh24'),'02',1,0)) "02",
+sum(decode(to_char(first_time, 'hh24'),'03',1,0)) "03",
+sum(decode(to_char(first_time, 'hh24'),'04',1,0)) "04",
+sum(decode(to_char(first_time, 'hh24'),'05',1,0)) "05",
+sum(decode(to_char(first_time, 'hh24'),'06',1,0)) "06",
+sum(decode(to_char(first_time, 'hh24'),'07',1,0)) "07",
+sum(decode(to_char(first_time, 'hh24'),'08',1,0)) "08",
+sum(decode(to_char(first_time, 'hh24'),'09',1,0)) "09",
+sum(decode(to_char(first_time, 'hh24'),'10',1,0)) "10",
+sum(decode(to_char(first_time, 'hh24'),'11',1,0)) "11",
+sum(decode(to_char(first_time, 'hh24'),'12',1,0)) "12",
+sum(decode(to_char(first_time, 'hh24'),'13',1,0)) "13",
+sum(decode(to_char(first_time, 'hh24'),'14',1,0)) "14",
+sum(decode(to_char(first_time, 'hh24'),'15',1,0)) "15",
+sum(decode(to_char(first_time, 'hh24'),'16',1,0)) "16",
+sum(decode(to_char(first_time, 'hh24'),'17',1,0)) "17",
+sum(decode(to_char(first_time, 'hh24'),'18',1,0)) "18",
+sum(decode(to_char(first_time, 'hh24'),'19',1,0)) "19",
+sum(decode(to_char(first_time, 'hh24'),'20',1,0)) "20",
+sum(decode(to_char(first_time, 'hh24'),'21',1,0)) "21",
+sum(decode(to_char(first_time, 'hh24'),'22',1,0)) "22",
+sum(decode(to_char(first_time, 'hh24'),'23',1,0)) "23",
+sum(decode(to_char(first_time, 'hh24'),'24',1,0)) "24"
+from v$log_history
+group by to_char(first_time, 'YYYY/MM/dd')
+order by to_char(first_time, 'YYYY/MM/dd')
+;
+
+exit