修改Oracle redo.log文件的大小

1.查看当前日志组成员：

SQL> select member from v$logfile;

MEMBER

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

C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO01.LOG

C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO02.LOG

C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO03.LOG

2.查看当前日志组状态：

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

GROUP# MEMBERS BYTES/1024/1024 STATUS

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

1 1 50 INACTIVE

2 1 50 INACTIVE

3 1 50 CURRENT

现有三个日志组，每个组内有一个成员，每个成员的大小为50MB，现在想把此三个日志组的成员大小都改为100MB ，步骤如下：

1、创建2个新的日志组

SQL> alter database add logfile group 4 ('C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO04.LOG') size 100M;

SQL> alter database add logfile group 5 ('C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO05.LOG') size 100M;

2、切换当前日志到新的日志组

SQL> alter system switch logfile;

SQL> alter system switch logfile;

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

GROUP# MEMBERS BYTES/1024/1024 STATUS

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

1 1 50 ACTIVE

2 1 50 ACTIVE

3 1 50 ACTIVE

4 1 100 CURRENT

5 1 100 ACTIVE

3、删除旧的日志组

SQL> alter database drop logfile group 1;

SQL> alter database drop logfile group 2;

SQL> 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REDO01.LOG、REDO02.LOG、REDO03.LOG。

5、重建日志组1、2、3

SQL> alter database add logfile group 1 ('C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO01.LOG') size 100M;

SQL> alter database add logfile group 2 ('C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO02.LOG') size 100M;

SQL> alter database add logfile group 3 ('C:\ORACLE\PRODUCT\10.2.0\ORADATA\FYDB\REDO03.LOG') size 100M;

6、切换日志组

SQL> alter system switch logfile;

SQL> alter system switch logfile;

7、删除中间过渡用的日志组4、5

SQL> alter database drop logfile group 4;

SQL> alter database drop logfile group 5;

SQL> select group#,status from v$log;

GROUP# STATUS

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

1 UNUSED

2 UNUSED

3 UNUSED

4 INACTIVE

5 CURRENT

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> conn / as sysdba

SQL> alter database backup controlfile to trace resetlogs;