Hello,
I can see archived log file's size is 44 mega bytes and redo log file is 513 mega bytes lately.
[oracle@orcl28 arch]$ ls -lrth
total 1.4G
-rw-r----- 1 oracle oinstall 43M Jul 9 23:01 1_22298_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 9 23:49 1_22299_910276848.dbf
-rw-r----- 1 oracle oinstall 43M Jul 10 01:30 1_22300_910276848.dbf
-rw-r----- 1 oracle oinstall 54M Jul 10 03:00 1_22301_910276848.dbf
-rw-r----- 1 oracle oinstall 46M Jul 10 03:00 1_22302_910276848.dbf
-rw-r----- 1 oracle oinstall 54M Jul 10 03:36 1_22303_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 06:56 1_22304_910276848.dbf
-rw-r----- 1 oracle oinstall 43M Jul 10 08:00 1_22305_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 08:29 1_22306_910276848.dbf
-rw-r----- 1 oracle oinstall 46M Jul 10 08:36 1_22307_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 08:52 1_22308_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 09:07 1_22309_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 09:19 1_22310_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 09:31 1_22311_910276848.dbf
-rw-r----- 1 oracle oinstall 32M Jul 10 09:40 1_22312_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 09:51 1_22313_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 10:01 1_22314_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 10:12 1_22315_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 10:23 1_22316_910276848.dbf
-rw-r----- 1 oracle oinstall 46M Jul 10 10:31 1_22317_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 10:42 1_22318_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 10:51 1_22319_910276848.dbf
-rw-r----- 1 oracle oinstall 45M Jul 10 11:01 1_22320_910276848.dbf
-rw-r----- 1 oracle oinstall 45M Jul 10 11:11 1_22321_910276848.dbf
-rw-r----- 1 oracle oinstall 47M Jul 10 11:22 1_22322_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 11:35 1_22323_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 11:50 1_22324_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 12:08 1_22325_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 12:28 1_22326_910276848.dbf
-rw-r----- 1 oracle oinstall 44M Jul 10 12:49 1_22327_910276848.dbf
-rw-r----- 1 oracle oinstall 43M Jul 10 13:10 1_22328_910276848.dbf
-rw-r----- 1 oracle oinstall 43M Jul 10 13:32 1_22329_910276848.dbf
[oracle@orcl28 orcl28]$ ls -lrth redo0*
-rw-r----- 1 oracle oinstall 513M Jul 10 11:50 redo04.log
-rw-r----- 1 oracle oinstall 513M Jul 10 12:08 redo05.log
-rw-r----- 1 oracle oinstall 513M Jul 10 12:28 redo06.log
-rw-r----- 1 oracle oinstall 513M Jul 10 12:49 redo07.log
-rw-r----- 1 oracle oinstall 513M Jul 10 13:10 redo03.log
-rw-r----- 1 oracle oinstall 513M Jul 10 13:32 redo02.log
-rw-r----- 1 oracle oinstall 513M Jul 10 13:48 redo01.log
and I query dynamic performance view 'v$active_session_history' period at 13:40-13:50 wait event.
select event,wait_class,count(*) from v$active_session_history
where sample_time between to_date('20170710 13:40','yyyymmdd hh24:mi') and to_date('20170710 13:50','yyyymmdd hh24:mi')
and event is not null
and machine != 'orcl28'
group by event,wait_class
order by 1 desc,3 desc;
event wait_class count(*)
------------------------------------- ---------------- ------------
log file sync Commit 17
db file sequential read User I/O 5
SQL*Net more data to client Network 3
SQL*Net more data from client Network 3
flashback log file sync User I/O 1
log file sync is major problem? and how to solve it ?