[Amit Bansal]

You can use following query for monitoring archive generation on hourly basis

set linesize 140
set feedback off
set timing off
set pagesize 1000
col ARCHIVED format a8
col ins    format 99  heading "DB"
col member format a80
col status format a12
col archive_date format a20
col member format a60
col type   format a10
col group#  format 99999999
col min_archive_interval format a20
col max_archive_interval format a20
col h00 heading "H00" format  a3
col h01 heading "H01" format  a3
col h02 heading "H02" format  a3
col h03 heading "H03" format  a3
col h04 heading "H04" format  a3
col h05 heading "H05" format  a3
col h06 heading "H06" format  a3
col h07 heading "H07" format  a3
col h08 heading "H08" format  a3
col h09 heading "H09" format  a3
col h10 heading "H10" format  a3
col h11 heading "H11" format  a3
col h12 heading "H12" format  a3
col h13 heading "H13" format  a3
col h14 heading "H14" format  a3
col h15 heading "H15" format  a3
col h16 heading "H16" format  a3
col h17 heading "H17" format  a3
col h18 heading "H18" format  a3
col h19 heading "H19" format  a3
col h20 heading "H20" format  a3
col h21 heading "H21" format  a3
col h22 heading "H22" format  a3
col h23 heading "H23" format  a3
col total format a6
col date format a10

-- select * from v$logfile order by group#;
-- select * from v$log order by SEQUENCE#;

select max( sequence#) last_sequence, max(completion_time) completion_time, max(block_size) block_size from v$archived_log ;

SELECT instance ins,
log_date "DATE" ,
lpad(to_char(NVL( COUNT( * ) , 0 )),6,' ') Total,
lpad(to_char(NVL( SUM( decode( log_hour , '00' , 1 ) ) , 0 )),3,' ') h00 ,
lpad(to_char(NVL( SUM( decode( log_hour , '01' , 1 ) ) , 0 )),3,' ') h01 ,
lpad(to_char(NVL( SUM( decode( log_hour , '02' , 1 ) ) , 0 )),3,' ') h02 ,
lpad(to_char(NVL( SUM( decode( log_hour , '03' , 1 ) ) , 0 )),3,' ') h03 ,
lpad(to_char(NVL( SUM( decode( log_hour , '04' , 1 ) ) , 0 )),3,' ') h04 ,
lpad(to_char(NVL( SUM( decode( log_hour , '05' , 1 ) ) , 0 )),3,' ') h05 ,
lpad(to_char(NVL( SUM( decode( log_hour , '06' , 1 ) ) , 0 )),3,' ') h06 ,
lpad(to_char(NVL( SUM( decode( log_hour , '07' , 1 ) ) , 0 )),3,' ') h07 ,
lpad(to_char(NVL( SUM( decode( log_hour , '08' , 1 ) ) , 0 )),3,' ') h08 ,
lpad(to_char(NVL( SUM( decode( log_hour , '09' , 1 ) ) , 0 )),3,' ') h09 ,
lpad(to_char(NVL( SUM( decode( log_hour , '10' , 1 ) ) , 0 )),3,' ') h10 ,
lpad(to_char(NVL( SUM( decode( log_hour , '11' , 1 ) ) , 0 )),3,' ') h11 ,
lpad(to_char(NVL( SUM( decode( log_hour , '12' , 1 ) ) , 0 )),3,' ') h12 ,
lpad(to_char(NVL( SUM( decode( log_hour , '13' , 1 ) ) , 0 )),3,' ') h13 ,
lpad(to_char(NVL( SUM( decode( log_hour , '14' , 1 ) ) , 0 )),3,' ') h14 ,
lpad(to_char(NVL( SUM( decode( log_hour , '15' , 1 ) ) , 0 )),3,' ') h15 ,
lpad(to_char(NVL( SUM( decode( log_hour , '16' , 1 ) ) , 0 )),3,' ') h16 ,
lpad(to_char(NVL( SUM( decode( log_hour , '17' , 1 ) ) , 0 )),3,' ') h17 ,
lpad(to_char(NVL( SUM( decode( log_hour , '18' , 1 ) ) , 0 )),3,' ') h18 ,
lpad(to_char(NVL( SUM( decode( log_hour , '19' , 1 ) ) , 0 )),3,' ') h19 ,
lpad(to_char(NVL( SUM( decode( log_hour , '20' , 1 ) ) , 0 )),3,' ') h20 ,
lpad(to_char(NVL( SUM( decode( log_hour , '21' , 1 ) ) , 0 )),3,' ') h21 ,
lpad(to_char(NVL( SUM( decode( log_hour , '22' , 1 ) ) , 0 )),3,' ') h22 ,
lpad(to_char(NVL( SUM( decode( log_hour , '23' , 1 ) ) , 0 )),3,' ') h23
FROM   (
SELECT thread# INSTANCE ,
TO_CHAR( first_time , 'DD-MON-YY' ) log_date ,
TO_CHAR( first_time , 'hh24' ) log_hour
FROM   v$log_history
)
GROUP  BY INSTANCE ,
log_date
ORDER  BY INSTANCE ,
to_date(log_date,'DD-MON-YY');

11g introduces PIVOT function which lets you write cross-tabulation queries that rotate rows into columns, aggregating data in the process of the rotation. For 11g it can be re-written as

col 00 heading "00" format  999
col 01 heading "01" format  999
col 02 heading "02" format  999
col 03 heading "03" format  999
col 04 heading "04" format  999
col 05 heading "05" format  999
col 06 heading "06" format  999
col 07 heading "07" format  999
col 08 heading "08" format  999
col 09 heading "09" format  999
col 10 heading "10" format  999
col 11 heading "11" format  999
col 12 heading "12" format  999
col 13 heading "13" format  999
col 14 heading "14" format  999
col 15 heading "15" format  999
col 16 heading "16" format  999
col 17 heading "17" format  999
col 18 heading "18" format  999
col 19 heading "19" format  999
col 20 heading "20" format  999
col 21 heading "21" format  999
col 22 heading "22" format  999
col 23 heading "23" format  999
select * from (
SELECT thread# INSTANCE ,
TO_CHAR( first_time , 'DD-MON-YY' ) log_date ,
TO_CHAR( first_time , 'hh24' ) log_hour ,count(*) num_arch
FROM   v$log_history where first_time >sysdate -7 group by thread# ,TO_CHAR( first_time , 'DD-MON-YY' ),TO_CHAR( first_time , 'hh24' ) )
pivot (sum (num_arch) for log_hour in (00,01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,19,20,21,22,23)) order by log_date,instance;

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