修改dataguard主库redo组数和大小

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标题:修改dataguard主库redo组数和大小

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

在一个dg环境中,配置的是实时同步,需要增加主库的redo大小和组数,本来是一个很简单的问题,解决思路是:先备库增加standby redo删除老standby redo,然后主库增加redo删除老redo,备库增加新redo删除老redo,最后主库增加standby redo。但是在实施过程中,遇到了一些细节性的问题,主要是学习到了log_file_name_convert如果不配置,将导致备库redo 文件不能被删除

standby redo log管理
增加standby redo log

SQL> alter database add standby logfile group 8 ('/data/oradata/wasudb/st_redo08.log') size 200M; 
alter database add standby logfile group 8 ('/data/oradata/wasudb/st_redo08.log') size 200M
*
ERROR at line 1:
ORA-01156: recovery in progress may need access to files

SQL> alter database recover managed standby database cancel;

Database altered.

SQL> alter database add standby logfile group 9 ('/data/oradata/wasudb/st_redo09.log') size 200M; 

Database altered.

SQL> alter database add standby logfile group 10 ('/data/oradata/wasudb/st_redo10.log') size 200M; 

Database altered.

SQL> alter database add standby logfile group 11 ('/data/oradata/wasudb/st_redo11.log') size 200M; 

Database altered.

SQL> alter database add standby logfile group 12 ('/data/oradata/wasudb/st_redo12.log') size 200M; 

Database altered.

删除standby redo log

SQL> alter database drop logfile group 4;
alter database drop logfile group 4
*
ERROR at line 1:
ORA-00261: log 4 of thread 1 is being archived or modified
ORA-00312: online log 4 thread 1: '/data/oradata/wasudb/st_redo04.log'


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.

--在主库多次执行switch logfile

SQL>  alter database drop logfile group 4;

Database altered.

主库redo log 管理
增加redo log

SQL> alter database add logfile group 21 ('/data/oradata/wasudb/redo21.log') size 200m;

Database altered.

SQL> alter database add logfile group 22 ('/data/oradata/wasudb/redo22.log') size 200m; 

Database altered.

SQL> alter database add logfile group 23 ('/data/oradata/wasudb/redo23.log') size 200m; 

Database altered.

SQL> alter database add logfile group 24 ('/data/oradata/wasudb/redo24.log') size 200m;

Database altered.

删除redo log

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;

Database altered.
--这里涉及到多次switch logfile,需要确定redo是inactive才能够删除

备库redo log管理
增加redo log

SQL> alter database add logfile group 21 ('/data/oradata/wasudb/redo21.log') size 200m; 
alter database add logfile group 21 ('/data/oradata/wasudb/redo21.log') size 200m
*
ERROR at line 1:
ORA-01275: Operation ADD LOGFILE is not allowed if standby file management is automatic.


SQL>  alter system set standby_file_management=manual;

System altered.

SQL> alter database add logfile group 21 ('/data/oradata/wasudb/redo21.log') size 200m;

Database altered.

SQL> alter database add logfile group 22 ('/data/oradata/wasudb/redo22.log') size 200m; 

Database altered.

SQL> alter database add logfile group 23 ('/data/oradata/wasudb/redo23.log') size 200m; 

Database altered.

SQL> alter database add logfile group 24 ('/data/oradata/wasudb/redo24.log') size 200m;

Database altered.

删除redo log

SQL> alter database drop logfile group 1;
alter database drop logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of instance wasudb (thread 1)
ORA-00312: online log 1 thread 1: '/data/oradata/wasudb/redo01.log'

SQL>  ALTER DATABASE CLEAR LOGFILE GROUP 1;
 ALTER DATABASE CLEAR LOGFILE GROUP 1
*
ERROR at line 1:
ORA-19527: physical standby redo log must be renamed
ORA-00312: online log 1 thread 1: '/data/oradata/wasudb/redo01.log'

SQL> show parameter NAME_CONVERT

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
log_file_name_convert                string

SQL> alter system set log_file_name_convert='/data/oradata/wasudb','/data/oradata/wasudb' scope=spfile;

System altered.

SQL>  alter system set db_file_name_convert='/data/oradata/wasudb','/data/oradata/wasudb' scope=spfile;

System altered.

--重启数据库

SQL> show parameter file_name_convert;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string      /data/oradata/wasudb, /data/or
                                                 adata/wasudb
log_file_name_convert                string      /data/oradata/wasudb, /data/or
                                                 adata/wasudb

SQL> alter database drop logfile group 1;
alter database drop logfile group 1
*
ERROR at line 1:
ORA-01624: log 1 needed for crash recovery of instance wasudb (thread 1)
ORA-00312: online log 1 thread 1: '/data/oradata/wasudb/redo01.log'

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;

Database altered.

SQL> alter database drop logfile group 1;

Database altered.

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 2;

Database altered.

SQL> alter database drop logfile group 2;

Database altered.

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 3;

Database altered.

SQL> alter database drop logfile group 3;

Database altered.

主库standby redo log管理
增加standby redo

SQL> alter database add logfile group 21 ('/data/oradata/wasudb/redo21.log') size 200m;

Database altered.

SQL> alter database add logfile group 22 ('/data/oradata/wasudb/redo22.log') size 200m; 

Database altered.

SQL> alter database add logfile group 23 ('/data/oradata/wasudb/redo23.log') size 200m; 

Database altered.

SQL> alter database add logfile group 24 ('/data/oradata/wasudb/redo24.log') size 200m;

Database altered.

删除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.

后续工作

SQL> alter system set standby_file_management=auto;

System altered.

SQL> alter database recover managed standby database using current logfile disconnect from session;

Database altered.

至此修改dataguard环境中的redo大小和增加redo组数的操作基本完成.在这里主要修正了自己以前对log_file_name_convert的认识,我以前以为如果我的主备库redo对应的目录一致不用配置该参数,今天通过查询MOS发现从10.2开始数据库为了能实现dg的快速切换在mrp启动的时候会去尝试清理备库redo,如果备库没有redo,或者log_file_name_convert配置不正确导致不能正常执行这个清理工作,数据库就会报ORA-19527,特别是在mrp进程启动之时.对于本次出现执行CLEAR LOGFILE命令也出现该问题,确实有点过犹不及了.这里也就是提醒我们:就算redo file,datafile主备位置相同,也建议配置log_file_name_convert和db_file_name_convert参数,提高dg健壮性.

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修改dataguard主库redo组数和大小》有 10 条评论

  1. 惜分飞 说:

    都是asm,你可以不用写,因为omf方式管理,你直接指定log和db默认磁盘组就可以了

    您好,这边咨询一件事情
    alter system set log_file_name_convert=\’+DATANEW/rrswldbdg/\’,\’+DATANEW/rrswldb/\’ scope=spfile;
    alter system set db_file_name_convert=\’+DATANEW/rrswldbdg/\’,\’+DATANEW/rrswldb/\’ scope=spfile;
    最后我多加了一个/ 发现现在数据文件主备库能自动创建而LOGFILE就不行了

      [引用]  [回复]

  2. chengyu yang 说:

    您好,这边咨询一件事情
    alter system set log_file_name_convert=\’+DATANEW/rrswldbdg/\’,\’+DATANEW/rrswldb/\’ scope=spfile;
    alter system set db_file_name_convert=\’+DATANEW/rrswldbdg/\’,\’+DATANEW/rrswldb/\’ scope=spfile;
    最后我多加了一个/ 发现现在数据文件主备库能自动创建而LOGFILE就不行了

      [引用]  [回复]

  3. 惜分飞 说:

    确保在任何情况下,都有足够的standby redo log来写对应的redo数据。
    如果standby redo log和redo log相等,那可能在redo切换的时候,standby redo没有及时写,从而出现异常

      [引用]  [回复]

  4. lory 说:

    飞总,请教一个问题,number of standby redo log file groups 就这个为啥一定要比主库的redo log group数目要多呢

      [引用]  [回复]

  5. 惜分飞 说:

    standby_file_management

    standby_file_management 管理的是文件级别的,对于你对数据库非关于数据文件,redo文件的操作语句,不会有影响。也就是说,一般的dml,ddl是没有影响的

      [引用]  [回复]

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