Data Guard 环境下主备库Redo log 的添加与删除

原创：/article/1363114.html

Standby redo的大小要和redo 的一致，所以主备库都要调整。

一. 主库操作

1.1 查看redo
信息

SQL> select group#,type, member from v$logfile;

GROUP# TYPE MEMBER

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

3 ONLINE /u01/app/oracle/oradata/xezf/redo03.log

2 ONLINE /u01/app/oracle/oradata/xezf/redo02.log

1 ONLINE /u01/app/oracle/oradata/xezf/redo01.log

4 STANDBY /u01/app/oracle/oradata/xezf/redo04.log

5 STANDBY /u01/app/oracle/oradata/xezf/redo05.log

6 STANDBY /u01/app/oracle/oradata/xezf/redo06.log

7 STANDBY /u01/app/oracle/oradata/xezf/redo07.log

7 rows selected.

SQL> select group#,thread#,archived,status, bytes/1024/1024 M from v$log;

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES INACTIVE 50

2 1 NO CURRENT 50

3 1 YES INACTIVE 50

1.2 修改standby redo

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.

SQL> alter database drop logfile group 7;

Database altered.

#rm -rf redo04.log redo05.log redo06.log redo07.log

SQL> select group#,type, member from v$logfile;

GROUP# TYPE MEMBER

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

3 ONLINE /u01/app/oracle/oradata/xezf/redo03.log

2 ONLINE /u01/app/oracle/oradata/xezf/redo02.log

1 ONLINE /u01/app/oracle/oradata/xezf/redo01.log

添加standby redo

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 4 ('/u01/app/oracle/oradata/xezf/std_redo04.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 5 ('/u01/app/oracle/oradata/xezf/std_redo05.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 6 ('/u01/app/oracle/oradata/xezf/std_redo06.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 7 ('/u01/app/oracle/oradata/xezf/std_redo07.log') size 100M;

Database altered.

SQL> select group#,type, member from v$logfile;

GROUP# TYPE MEMBER

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

3 ONLINE /u01/app/oracle/oradata/xezf/redo03.log

2 ONLINE /u01/app/oracle/oradata/xezf/redo02.log

1 ONLINE /u01/app/oracle/oradata/xezf/redo01.log

4 STANDBY /u01/app/oracle/oradata/xezf/std_redo04.log

5 STANDBY /u01/app/oracle/oradata/xezf/std_redo05.log

6 STANDBY /u01/app/oracle/oradata/xezf/std_redo06.log

7 STANDBY /u01/app/oracle/oradata/xezf/std_redo07.log

7 rows selected.

1.3 修改Online redo

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES INACTIVE 50

2 1 NO CURRENT 50

3 1 YES INACTIVE 50

先处理inactive，它表示已经完成规定的，可以删除。

SQL> alter database drop logfile group 1;

Database altered.

SQL> alter database drop logfile group 3;

alter database drop logfile group 3

*

ERROR at line 1:

ORA-01567: dropping log 3 would leave less than 2 log files for instance xezf

(thread 1)

ORA-00312: online log 3 thread 1: '/u01/app/oracle/oradata/xezf/redo03.log'

-- 至少要2个redo组，看来还是只能慢慢来了。

SQL> alter database add logfile
group 1 ('/u01/app/oracle/oradata/xezf/redo01.log') size 100M;

alter database add logfile group 1 ('/u01/app/oracle/oradata/xezf/redo01.log') size 100M

*

ERROR at line 1:

ORA-00301: error in adding log file '/u01/app/oracle/oradata/xezf/redo01.log' -

file cannot be created

ORA-27038: created file already exists

Additional information: 1

-- 物理文件没有删除，手工的把物理文件删除后，在创建：

SQL> alter database add logfile group 1 ('/u01/app/oracle/oradata/xezf/redo01.log') size 100M;

Database altered.

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES UNUSED 100

2 1 NO CURRENT 50

3 1 YES INACTIVE 50

group1 搞定了。

SQL> alter database drop logfile group 3;

Database altered.

删除对应的物理文件，在添加

SQL> alter database add logfile group 3 ('/u01/app/oracle/oradata/xezf/redo03.log') size 100M;

Database altered.

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES UNUSED 100

2 1 NO CURRENT 50

3 1 YES UNUSED 100

group3 搞定。

切换一下logfile，在删除group2

SQL> alter system switch logfile;

System altered.

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 NO CURRENT 100

2 1 YES ACTIVE
50

-- group
正在归档，我们等会在看一下

3 1 YES UNUSED 100

几分钟之后：

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 NO CURRENT 100

2 1 YES
INACTIVE 50

3 1 YES UNUSED 100

SQL> alter database drop logfile group 2;

Database altered.

删除物理文件，在创建

SQL> alter database add logfile group 2 ('/u01/app/oracle/oradata/xezf/redo02.log') size 100M;

Database altered.

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 NO CURRENT 100

2 1 YES UNUSED 100

3 1 YES UNUSED 100

主库搞定。

二. 备库操作

2.1 查看信息

SQL> select group#,type, member from v$logfile;

GROUP# TYPE MEMBER

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

3 ONLINE /u01/app/oracle/oradata/xezf/redo03.log

2 ONLINE /u01/app/oracle/oradata/xezf/redo02.log

1 ONLINE /u01/app/oracle/oradata/xezf/redo01.log

4 STANDBY /u01/app/oracle/oradata/xezf/redo04.log

5 STANDBY /u01/app/oracle/oradata/xezf/redo05.log

6 STANDBY /u01/app/oracle/oradata/xezf/redo06.log

7 STANDBY /u01/app/oracle/oradata/xezf/redo07.log

7 rows selected.

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES CLEARING_CURRENT 50

3 1 YES CLEARING 50

2 1 YES CLEARING 50

2.2 处理standby redo

对于standby 上redo的处理之前，我们要先停掉redo 的apply：

SQL> alter database recover managed standby database cancel;

不然会报如下错误：

SQL> alter database drop logfile group 2;

alter database drop logfile group 2

*

ERROR at line 1:

ORA-01156: recovery in progress may need access to files

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.

SQL> alter database drop logfile group 7;

Database altered.

$ rm redo04.log

$ rm redo05.log

$ rm redo06.log

$ rm redo07.log

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 4 ('/u01/app/oracle/oradata/xezf/std_redo04.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 5 ('/u01/app/oracle/oradata/xezf/std_redo05.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 6 ('/u01/app/oracle/oradata/xezf/std_redo06.log') size 100M;

Database altered.

SQL> ALTER DATABASE ADD STANDBY LOGFILE GROUP 7 ('/u01/app/oracle/oradata/xezf/std_redo07.log') size 100M;

Database altered.

SQL> select group#,type, member from v$logfile;

GROUP# TYPE MEMBER

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

3 ONLINE /u01/app/oracle/oradata/xezf/redo03.log

2 ONLINE /u01/app/oracle/oradata/xezf/redo02.log

1 ONLINE /u01/app/oracle/oradata/xezf/redo01.log

4 STANDBY /u01/app/oracle/oradata/xezf/std_redo04.log

5 STANDBY /u01/app/oracle/oradata/xezf/std_redo05.log

6 STANDBY /u01/app/oracle/oradata/xezf/std_redo06.log

7 STANDBY /u01/app/oracle/oradata/xezf/std_redo07.log

7 rows selected.

2.3 处理online redo

先将standby_file_management设为手动：

SQL> alter system set standby_file_management=manual;

System altered.

不然会报错：

SQL> alter database drop logfile group 2;

alter database drop logfile group 2

*

ERROR at line 1:

ORA-01275: Operation DROP LOGFILE is not allowed if standby file management is automatic.

在Oracle 官网上搜了一下，找到了一篇文章：

How to Add/Drop/Resize Redo Log with Physical Standby in place. [ID 473442.1]

http://blog.csdn.net/tianlesoftware/archive/2010/12/08/6063677.aspx

SQL> SELECT GROUP#, STATUS FROM V$LOG;

GROUP# STATUS

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

1 CLEARING_CURRENT

3 CLEARING

2 CLEARING

SQL>

SQL> alter database clear logfile group 2;

alter database clear logfile group 2

*

ERROR at line 1:

ORA-19527: physical standby redo log must be renamed

ORA-00312: online log 2 thread 1: '/u01/app/oracle/oradata/xezf/redo02.log'

ORA-19527:	physical standby redo log must be renamed
Cause:	The CLEAR LOGFILE command was used at a physical standby database. This command cannot be used at a physical standby database unless the LOG_FILE_NAME_CONVERT initialization parameter is set. This is required to avoid overwriting the primary database's logfiles.
Action:	Set the LOG_FILE_NAME_CONVERT initialization parameter.

我们需要设置LOG_FILE_NAME_CONVERT
参数，才能使用clear logfile命令。 参考：

ORA-00313, ORA-00312, ORA-27037 in Standby Database [ID 601835.1]

http://blog.csdn.net/tianlesoftware/archive/2010/12/08/6063749.aspx

解决方法如下：

SQL> shutdown immediate

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

在pfile里添加参数：

语法：*.log_file_name_convert = '<location on primary>','<location on standby>'

*.log_file_name_convert ='/u01/app/oracle/oradata/xezf/','/u01/app/oracle/oradata/xezf/'

用pfile
启动备库：

SQL> startup nomount pfile='/u01/app/oracle/product/10.2.0/db_1/dbs/initxezf.ora';

ORACLE instance started.

Total System Global Area 1610612736 bytes

Fixed Size 2096632 bytes

Variable Size 385876488 bytes

Database Buffers 1207959552 bytes

Redo Buffers 14680064 bytes

SQL> alter database mount standby database;

Database altered.

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

GROUP# STATUS

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

1 CLEARING

3 CLEARING

2 CLEARING_CURRENT

SQL> show parameter log_file_name_convert

NAME TYPE VALUE

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

log_file_name_convert string /u01/app/oracle/oradata/xezf, /u01/app/oracle/oradata/xezf/

SQL> alter database clear logfile group 1;

Database altered.

SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='MANUAL';

System altered.

SQL> alter database drop logfile group 1;

Database altered.

删除物理文件：

$ rm redo01.log

创建新的日志组：

SQL> alter database add logfile group 1 ('/u01/app/oracle/oradata/xezf/redo01.log') size 100M;

Database altered.

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

GROUP# STATUS

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

1 UNUSED

3 CLEARING

2 CLEARING_CURRENT

处理下一个redo
日志：

SQL> alter database clear logfile group 3;

Database altered.

SQL> alter database drop logfile group 3;

Database altered.

删除物理文件：

$ rm redo03.log

SQL> alter database add logfile group 3 ('/u01/app/oracle/oradata/xezf/redo03.log') size 100M;

Database altered.

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

GROUP# STATUS

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

1 UNUSED

3 UNUSED

2 CLEARING_CURRENT

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES UNUSED 100

3 1 YES UNUSED 100

2 1 YES CLEARING_CURRENT 50

还有最后一个redo
组没有处理，这个要先切换过来：

（1）在备库启动recover
进程：

SQL> alter database recover managed standby database disconnect from session;

SQL>ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='AUTO';

（2）到主库手动切换几次redo

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

在查看备库的redo：

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='MANUAL';

System altered.

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

GROUP# STATUS

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

1 UNUSED

3 CLEARING_CURRENT

2 CLEARING

SQL> alter database clear logfile group 2;

Database altered.

SQL> alter database drop logfile group 2;

Database altered.

物理删除文件：

[oracle@qs-xezf-db2 xezf]$ rm redo02.log

添加redo：

SQL> alter database add logfile group 2 ('/u01/app/oracle/oradata/xezf/redo02.log') size 100M;

Database altered.

查看：

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

GROUP# THREAD# ARC STATUS BYTES/1024/1024

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

1 1 YES UNUSED 100

3 1 YES CLEARING_CURRENT 100

2 1 YES UNUSED 100

搞定，最后启动recover，验证：

SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='AUTO';

System altered.

SQL> alter database recover managed standby database disconnect from session;

Database altered.

主库：

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> select max(sequence#) from v$archived_log;

MAX(SEQUENCE#)

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

15

备库：

SQL> select sequence#,applied from v$archived_log;

SEQUENCE# APP

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

2 YES

3 YES

5 YES

4 YES

7 YES

6 YES

8 YES

9 YES

13 YES

10 YES

11 YES

SEQUENCE# APP

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

12 YES

14 YES

15 YES

14 rows selected.

同步正常。 ok。