--1.增加4组大的日志文件

ALTER DATABASE ADD LOGFILE GROUP 6 ('/dev/vgdata3/rbill_log6') SIZE 2560M;
ALTER DATABASE ADD LOGFILE GROUP 7 ('/dev/vgdata3/rbill_log7') SIZE 2560M;
ALTER DATABASE ADD LOGFILE GROUP 8 ('/dev/vgdata4/rbill_log8') SIZE 2560M;
ALTER DATABASE ADD LOGFILE GROUP 9 ('/dev/vgdata4/rbill_log9') SIZE 2560M;

--2.切换current到新的组
alter system switch logfile;
select * from v$log;

--3.删除旧日志

alter database drop logfile group 1;
alter database drop logfile group 2;
alter database drop logfile group 3;
alter database drop logfile group 4;
alter database drop logfile group 5;

--4.切换测试

alter system switch logfile;
alter system checkpoint
--5.备份controlfile

alter database backup controlfile to trace ;

--6.修改DB的log_buffer

alter system set log_buffer=536870912 scope=spfle;

shutdown immediate;

startup