目的:修改当前在线日志从默认50M增加至512M。

1.查看当前日志组的状态

SQL> select group#,members,bytes/1024/1024,status from v$log;

GROUP#    MEMBERS BYTES/1024/1024 STATUS

---------- ---------- --------------- ----------------

1          1              50 INACTIVE

2          1              50 CURRENT

3          1              50 INACTIVE

2.查看在线日志组的位置

SQL> select MEMBER from v$logfile;

MEMBER

--------------------------------------------------------------------------------

/u01/app/oradata/ARPDB/redo01.log

/u01/app/oradata/ARPDB/redo02.log

/u01/app/oradata/ARPDB/redo03.log

3.新增group 4-6日志组，大小为512M

alter database add logfile group 4 ('/u01/app/oradata/ARPDB/redo04.log') size 512M;

alter database add logfile group 5 ('/u01/app/oradata/ARPDB/redo05.log') size 512M;

alter database add logfile group 6 ('/u01/app/oradata/ARPDB/redo06.log') size 512M;

4.切换当前日志到新的日志组

alter system switch logfile;

alter system switch logfile;

---让在线日志组，变成inactive的方式，执行如下命令：

alter system checkpoint;

5.删除旧的日志组

alter database drop logfile group 1;

alter database drop logfile group 2;

alter database drop logfile group 3;

6.查看修改后的日志组的状态信息：

SQL> select group#,members,bytes/1024/1024,status from v$log;

GROUP#    MEMBERS BYTES/1024/1024 STATUS

---------- ---------- --------------- ----------------

4          1             512 INACTIVE

5          1             512 CURRENT

6          1             512 UNUSED

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