调整ORACLE日志文件方法

方法一：

调整ORACLE日志文件为8个

默认下，oracle日志为3个，可以调整为8个以避免日志文件

1、创建5个新的日志组

ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo04.log') SIZE 50M;

ALTER DATABASE ADD LOGFILE GROUP 5 ('/u01/app/oracle/oradata/orcl/redo05.log') SIZE 50M;

ALTER DATABASE ADD LOGFILE GROUP 6 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 50M;

ALTER DATABASE ADD LOGFILE GROUP 7 ('/u01/app/oracle/oradata/orcl/redo07.log') SIZE 50M;

ALTER DATABASE ADD LOGFILE GROUP 8 ('/u01/app/oracle/oradata/orcl/redo08.log') SIZE 50M;

2、切换当前日志到新的日志组

alter system switch logfile;

alter system switch logfile;

alter system switch logfile;

alter system switch logfile;

alter system switch logfile;

3、查看每组状态的命令为：

select group#,sequence#,archived,members,status from v$log;

方法二：

方法二：

修改Oracle重做日志文件大小

1.创建3个新的日志组

SQL> ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo04.log') SIZE 500M;

SQL> ALTER DATABASE ADD LOGFILE GROUP 5 ('/u01/app/oracle/oradata/orcl/redo05.log') SIZE 500M;

SQL> ALTER DATABASE ADD LOGFILE GROUP 6 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;

查看日志组

SQL> select * from v$logfile;

2.切换当前日志到新的日志组

SQL> alter system switch logfile;

SQL> alter system switch logfile;

SQL> alter system switch logfile;

要删除为INCACTIVE状态才行

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

GROUP# SEQUENCE# BYTES MEMBERS STATUS

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

1 139 52428800 1 INACTIVE

2 137 52428800 1 INACTIVE

3 138 52428800 1 INACTIVE

4 140 524288000 1 ACTIVE

5 141 524288000 1 CURRENT

6 136 524288000 1 INACTIVE

3.删除旧的日志组

SQL> alter database drop logfile group 1;

Database altered.

SQL> alter database drop logfile group 2;

Database altered.

SQL> alter database drop logfile group 3;

查看是否删除了日志组

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

GROUP# SEQUENCE# BYTES MEMBERS STATUS

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

4 140 524288000 1 INACTIVE

5 141 524288000 1 CURRENT

6 136 524288000 1 INACTIVE

4.操作系统删除原日志组1、2、3中的文件

[oracle@oracle122 log]$ cd /u01/app/oracle/oradata/orcl

[oracle@oracle122 orcl]$

[oracle@oracle122 orcl]$ pwd

/u01/app/oracle/oradata/orcl

[oracle@oracle122 orcl]$ ls

control01.ctl example01.dbf redo01.log redo02.log redo03.log redo04.log redo05.log redo06.log sysaux01.dbf system01.dbf temp01.dbf undotbs01.dbf users01.dbf

[oracle@oracle122 orcl]$ rm -rf redo01.log

[oracle@oracle122 orcl]$ rm -rf redo02.log

[oracle@oracle122 orcl]$ rm -rf redo03.log

5.重建日志组1、2、3

SQL> ALTER DATABASE ADD LOGFILE GROUP 1 ('/u01/app/oracle/oradata/orcl/redo01.log') SIZE 500M;

SQL> ALTER DATABASE ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/orcl/redo02.log') SIZE 500M;

SQL> ALTER DATABASE ADD LOGFILE GROUP 3 ('/u01/app/oracle/oradata/orcl/redo03.log') SIZE 500M;

7.删除中间过渡用的日志组4、5、6 ，在删除时查询select group#,status from v$log; 删除组是否为INACTIVE，如果不是INACTIVE 就要执行alter system switch logfile;

查询看一下

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

GROUP# SEQUENCE# BYTES MEMBERS STATUS

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

1 148 524288000 1 CURRENT

2 143 524288000 1 INACTIVE

3 144 524288000 1 INACTIVE

4 146 524288000 1 INACTIVE

5 147 524288000 1 INACTIVE

6 145 524288000 1 INACTIVE

SQL> alter database drop logfile group 4;

Database altered.

SQL> alter database drop logfile group 5;

Database altered.

SQL> alter database drop logfile group 6;

Database altered.

8.到操作系统删除组4、5、6

[oracle@oracle122 orcl]$ rm -rf redo04.log

[oracle@oracle122 orcl]$ rm -rf redo05.log

[oracle@oracle122 orcl]$ rm -rf redo06.log

9.备份当前最新的控制文件

SQL> alter database backup controlfile to trace resetlogs ;

转自：

http://www.linuxidc.com/Linux/2014-11/109457.htm

（编辑：李大同）

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