1、创建新的日志组
1.alter database add logfile group 4 (‘/u01/app/oracle/oradata/jian/redo04.log’) size 1024k;
2.alter database add logfile group 5 （‘/u01/app/oracle/oradata/jian/redo05.log’) size 1024k;
2、切换当前日志到新的日志组
1.alter system switch logfile;
2.alter system switch logfile;
3、删除旧的日志组
1.alter database drop logfile group 1;
2.alter database drop logfile group 2;
3.alter database drop logfile group 3;
4、操作系统下删除原日志组1、2、3中的文件
5、重建日志组1、2、3
1.alter database add logfile group 1 (’/u01/app/oracle/oradata/jian/redo01.log’) size 10M;
2.alter database add logfile group 2 (’/u01/app/oracle/oradata/jian/redo02.log’) size 10M;
3.alter database add logfile group 3 (’/u01/app/oracle/oradata/jian/redo03.log’) size 10M;
6、切换日志组
1.alter system switch logfile;
2.alter system switch logfile;
3.alter system switch logfile;
7、删除日志组4、5
1.alter database drop logfile group 4;
2.alter database drop logfile group 5;
8、到操作系统下删除原日志组4、5中的文件
9、备份当前的最新的控制文件
SQL> alter database backup controlfile to trace resetlogs
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