Oracle Redo Management

1. Classification

Several types of log files in Oracle

• Redo log files–> Online redo log

• Archive Log files–> Archive logs

• Alert Log files–> Alarm logs

• Trace files–> trace log

• User_dump_dest–> User trace log

• Backupground_dump_dest–> Process trace Log

2. Operation

View Redo Groups

SELECT group#,sequence#,members,bytes,status,archived FROM v$log;

View details of members within a redo group
select * from v$logfile
Add Group

alter  database add  logfile group 4 (‘/opt/oradata/orcl/redo04.log‘) size 52428800;

Delete a group

alter database drop logfile group 4;

Add Member
““
ALTER DATABASE ADD LOGFILE MEMBER '/opt/oradata/orcl/redo04a.log ' to GROUP 4;

警告日志

SELECT * from V$diag_info;
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Oracle Redo Management