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Redo log switching tips
Oracle Database Tips by Donald BurlesonFebruary 3, 2015
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Question: How do I force a redo log
switch. I need a script to see when my redo logs are
switching and I want to know the command to make Oracle
switch log files.
Answer: To switch the log file, simply issues
the
alter system switch logfile command.
Oracle provides data dictionary
views for the online redo logs as seen in this table:
v$log
- Lists information about each member of each online redo
log group.
v$logfile
- Provides redo log file name information
If you query v$log, you will see
information about each redo log group, including the size of
each member and how many members in each log group. Most
importantly, you can find out which log group is the CURRENT
redo log group. Remember the alter system switch logfile
command in the case that you want to change it.
Here is a dictionary query to
display the redo logs switching by date and time.
Please see
the
Oracle script
collection for a complete set of redo log scripts:
set lines 120;
set pages 999;
select
substr(time,1,5) day,
to_char(sum(decode(substr(time,10,2),'00',1,0)),'99')
"00",
to_char(sum(decode(substr(time,10,2),'01',1,0)),'99')
"01",
to_char(sum(decode(substr(time,10,2),'02',1,0)),'99')
"02",
to_char(sum(decode(substr(time,10,2),'03',1,0)),'99')
"03",
to_char(sum(decode(substr(time,10,2),'04',1,0)),'99')
"04",
to_char(sum(decode(substr(time,10,2),'05',1,0)),'99')
"05",
to_char(sum(decode(substr(time,10,2),'06',1,0)),'99')
"06",
to_char(sum(decode(substr(time,10,2),'07',1,0)),'99')
"07",
to_char(sum(decode(substr(time,10,2),'08',1,0)),'99')
"08",
to_char(sum(decode(substr(time,10,2),'09',1,0)),'99')
"09",
to_char(sum(decode(substr(time,10,2),'10',1,0)),'99')
"10",
to_char(sum(decode(substr(time,10,2),'11',1,0)),'99')
"11",
to_char(sum(decode(substr(time,10,2),'12',1,0)),'99')
"12",
to_char(sum(decode(substr(time,10,2),'13',1,0)),'99')
"13",
to_char(sum(decode(substr(time,10,2),'14',1,0)),'99')
"14",
to_char(sum(decode(substr(time,10,2),'15',1,0)),'99')
"15",
to_char(sum(decode(substr(time,10,2),'16',1,0)),'99')
"16",
to_char(sum(decode(substr(time,10,2),'17',1,0)),'99')
"17",
to_char(sum(decode(substr(time,10,2),'18',1,0)),'99')
"18",
to_char(sum(decode(substr(time,10,2),'19',1,0)),'99')
"19",
to_char(sum(decode(substr(time,10,2),'20',1,0)),'99')
"20",
to_char(sum(decode(substr(time,10,2),'21',1,0)),'99')
"21",
to_char(sum(decode(substr(time,10,2),'22',1,0)),'99')
"22",
to_char(sum(decode(substr(time,10,2),'23',1,0)),'99')
"23"
from v$log_history
group
by substr(time,1,5);
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