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oracle RAC切换归档

(转自leshami)   
RAC环境下的归档模式切换与单实例稍有不同,主要是共享存储所产生的差异。在这种情况下,我们可以将RAC数据库切换到非集群状态下,仅仅在一个实例上来实施归档模式切换即可完成RAC数据库的归档模式转换问题。本文主要描述了由非归档模式切换到归档模式,而由非归档切换的归档步骤相同,不再赘述。
 
1.1、主要步骤:  2. 备份spfile,以防止参数修改失败导致数据库无法启动  3. 修改集群参数cluster_database为false  4. 启动单实例到mount状态  5. 将数据库置于归档模式(alter database archivelog/noarchivelog)  6. 修改集群参数cluster_database为true  7. 关闭单实例  8. 启动集群数据库  9.  10.2、环境   11. oracle@bo2dbp:~> cat /etc/issue  12.  13. Welcome to SUSE Linux Enterprise Server 10 SP3 (x86_64) - Kernel \r (\l).  14.  15. oracle@bo2dbp:~> sqlplus -v  16.  17. SQL*Plus: Release 10.2.0.3.0 - Production  18.   19. 使用asm存储方式存放归档日志  20.  21.3、修改集群数据库到归档模式  22. oracle@bo2dbp:~> export ORACLE_SID=ora10g1  23. oracle@bo2dbp:~> sqlplus / as sysdba  24.  25. SQL*Plus: Release 10.2.0.3.0 - Production on Mon Dec 24 16:53:18 2012  26.  27. Copyright (c) 1982, 2006, Oracle.  All Rights Reserved.  28.  29. Connected to:  30. Oracle Database 10g Release 10.2.0.3.0 - 64bit Production  31. With the Real Application Clusters option  32.  33. SQL> archive log list;    -->查看当前数据库的归档模式  34. Database log mode              No Archive Mode          -->非归档模式  35. Automatic archival             Disabled  36. Archive destination            USE_DB_RECOVERY_FILE_DEST  37. Oldest online log sequence     59  38. Current log sequence           60  39.  40. SQL> select instance_name,host_name,status from gv$instance;  41.  42. INSTANCE_NAME    HOST_NAME            STATUS  43. ---------------- -------------------- ------------  44. ora10g1          bo2dbp               OPEN  45. ora10g2          bo2dbs               OPEN  46.  47. SQL> show parameter cluster      -->查看集群的参数,cluster_database为true表示为集群数据库,否则,非集群数据库  48.  49. NAME                                 TYPE        VALUE  50. ------------------------------------ ----------- ------------------------------  51. cluster_database                     boolean     TRUE  52. cluster_database_instances           integer     2  53. cluster_interconnects                string  54.  55. SQL> create pfile=/u01/oracle/db/dbs/ora10g_robin.ora from spfile;  -->先备份spfile  56.  57. File created.  58.  59. SQL> alter system set cluster_database=false scope=spfile sid=*;  -->修改为非集群数据库,该参数为静态参数,需要使用scope=spfile  60.  61. System altered.  62.  63. oracle@bo2dbp:~> srvctl stop database -d ora10g                        -->关闭数据库  64. oracle@bo2dbp:~> srvctl start instance -d ora10g -i ora10g1 -o mount   -->启动单个实例到mount状态  65. oracle@bo2dbp:~> sqlplus / as sysdba  66. SQL> select instance_name,status from v$instance;  67.  68. INSTANCE_NAME    STATUS  69. ---------------- ------------  70. ora10g1          MOUNTED  71.  72. SQL> alter database archivelog;                                       -->改变数据库到归档模式  73.  74. Database altered.  75.  76. SQL> alter system set cluster_database=true scope=spfile sid=*;    -->在将数据库改为集群模式  77.  78. System altered.  79.  80. SQL> ho srvctl stop instance -d ora10g -i ora10g1                     -->关闭当前实例  81.  82. SQL> ho srvctl start database -d ora10g                               -->启动集群数据库  83.    84. SQL> archive log list;  85. ORA-03135: connection lost contact  86. SQL> conn / as sysdba  87. Connected.  88. SQL> archive log list;                                                -->查看归档模式  89. Database log mode              Archive Mode                           -->已经处于归档模式  90. Automatic archival             Enabled                                -->自动归档  91. Archive destination            USE_DB_RECOVERY_FILE_DEST              -->归档位置为参数DB_RECOVERY_FILE_DEST的值  92. Oldest online log sequence     60                                     -->下面是sequence相关信息     93. Next log sequence to archive   61  94. Current log sequence           61  95.  96. SQL> show parameter db_recovery_file  97.  98. NAME                                 TYPE        VALUE  99. ------------------------------------ ----------- ------------------------------  100. db_recovery_file_dest                string      +REV  101. db_recovery_file_dest_size           big integer 2G  102.  

下面的方式修改也可以(推荐使用上面的方式,安全简单):

如果Oracle数据库运行在归档模式,当进行数据库维护时,可能需要暂停数据库的归档,在完成维护后,再重新启动归档模式。通过以下步骤可以从归档模式转换为非归档模式:
 
以下步骤在一台机器上操作。节点二保持down。在所有的操作完成后在打开节点二的数据库。。。SQLPLUS>connect SYS/PASSWORDSQLPLUS>ALTER SYSTEM SET CLUSTER_DATABASE=FALSE SCOPE=SPFILE;SQLPLUS>shutdown immediate;SQLPLUS>startup mount exclusive;SQLPLUS>alter database noarchivelog;SQLPLUS>ALTER SYSTEM SET CLUSTER_DATABASE=TRUE SCOPE=SPFILE;SQLPLUS>shutdown immediate;SQLPLUS>STARTUP 非归档改为归档SQLPLUS>connect SYS/PASSWORDSQLPLUS>ALTER SYSTEM SET CLUSTER_DATABASE=FALSE SCOPE=SPFILE;SQLPLUS>shutdown immediate;SQLPLUS>startup mount exclusive;SQLPLUS>alter database archivelog;SQLPLUS>ALTER SYSTEM SET CLUSTER_DATABASE=TRUE SCOPE=SPFILE;SQLPLUS>shutdown immediate;SQLPLUS>STARTUP

 

 

但是我经过测试发现,不需要修改参数database_cluster,直接两节点全部shutdown immediate,然后把一个节点启动到mount模式,直接改变归档alter database archivelog; 再执行shutdown immediate,然后把两个数据库都拉起来就可以!!! 

 
错误:
testdb101@db10a  /home/oracle$ srvctl stop instance -d testdb10 -i testdb101/u01/crs1020/jdk/jre/bin/java: error while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directoryalert日志里面db_recovery_file_dest_size of 2048 MB is 10.55% used. This is auser-specified limit on the amount of space that will be used by thisdatabase for recovery-related files, and does not reflect the amount ofspace available in the underlying filesystem or ASM diskgroup.

 解决:这是10g的一个bug,在srvctl脚本中加入

unset LD_ASSUME_KERNEL
就可以了。

oracle RAC切换归档