Data Guard 环境下 主备库Redo log 的添加与删除

 

 

 

       刚搭建完一个Data Gard 环境。 在服务器上弄的，过几天要上生产线。 安装的时候redo 默认了50M。 而且standby redo 也是50M。 和同事讨论之后，还是把改成100M。50M 确实小了点。

       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 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.

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.

 

[oracle@qs-xezf-db2 xezf]$ rm redo04.log

[oracle@qs-xezf-db2 xezf]$ rm redo05.log

[oracle@qs-xezf-db2 xezf]$ rm redo06.log

[oracle@qs-xezf-db2 xezf]$ 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：

[oracle@qs-xezf-db2 xezf]$ 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：

[oracle@qs-xezf-db2 xezf]$ 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。

 

 

 

 

 

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