【ORACLE】oracle 日志文件管理

修改Oracle重做日志文件大小

创建新的日志组1

删除旧的日志组0（旧的日志组状态需要是INACTIVE）

创建新的日志组2，组名为旧的日志组0的组名

删除日志组1

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具体操作步骤：

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1. 创建3个新的日志组

ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;

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

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

查看日志组

select * from v$logfile;

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;

切到要删除为INCACTIVE才行

select group#,sequence#,bytes,members,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

alter database drop logfile group 1;

Database altered.

4. 查看是否删除了日志组

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

GROUP# SEQUENCE# BYTES MEMBERS STATUS
---------- ---------- ---------- ---------- ----------------
4 140 524288000 1 INACTIVE
5 141 524288000 1 CURRENT
6 136 524288000 1 INACTIVE

5. 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]$ 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

6. 重建日志组 1、2、3

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

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

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#,sequence#,bytes,members,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

select group#,sequence#,bytes,members,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

alter database backup controlfile to trace resetlogs  ;

【ORACLE】oracle 日志文件管理

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