物理DG主备切换小结

检查两RAC的参数文件配置

SQL> show parameter spfile;

SQL>show parameter fal;

lsnrctl status 查看RAC环境中监听状态

tnsping 查看TNS的连通情况

如果需要RAC作为备库执行如下步骤

①.为RAC环境添加standby redolog,而且作为备库redolog group数要多于或等于主库:

SQL>alter database add standby logfile thread 1 group 5 size 50M ,group 6 size 50M ,group 7 size 50M ;

单实例添加方法:

SQL>alter database add standby logfile group 7 '/oradata/racdb/onlinelog/group_7.log' size 50M;

②.配置RAC环境中以下两个参数指定到自己的文件路径

SQL> alter system set db_file_name_convert='+DATA/phydb/','+DATA/racdb/' sid='*' scope=spfile;

SQL> alter system set  log_file_name_convert='+DATA/phydb/','+DATA/racdb/' sid='*' scope=spfile;

检查standby数据库
SQL> select status from v$instance;
 SQL> select open_mode from v$database;
 SQL> select member from v$logfile;

如果没有standby redolog需要创建,语法如下:

SQL>alter database add standby logfile group 7 '/oradata/racdb/onlinelog/group_7.log' size 50M;

SQL> select name from v$datafile;

SQL> select name from v$tempfile;

SQL> show parameter control;

正常切换

①. 切换前检查RAC环境中数据库状态

SQL> select dbid,name,protection_mode,database_role,open_mode,switchover_status from gv$database;

关闭任一节点数据库

SQL> shutdown immediate;

②.将主库切换为备库

SQL>alter database commit to switchover to physical standby with session shutdown;

切换过程中查看数据库状态

③.备库将已经完成传输的日志应用完成,确保数据不会丢失

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

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

SQL> alter database recover managed standby database cancel;

④. 断开所有连接会话(或者重启备库到mount状态),切换至主库

SQL> alter database commit to switchover to primary;(mount状态)

⑤.打开数据库,查看新主库的状态是否正常

SQL>alter database open;

SQL> select dbid,name,protection_mode,database_role,open_mode,switchover_status from v$database;

主库故障无法修复,快速切换备库为主库

启动备库到mount状态,查看数据库standby信息:

SQL>startup mount;

启动日志应用,确保最大限度的可以日志应用完成后,再开始切换

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

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

SQL> alter database recover managed standby database cancel;

SQL>select thread#,low_sequence#,high_sequence from v$archive_gap;

确保日志传输完成,如果有返回记录,需要去主库上将该文件copy至备库相应目录下,并执行以下语句使之生效

SQL> alter database register physical logfile 'filespecl';

主备库上都查询一下归档的最大序列号,确保主库的归档备库上都有,如果发现备库没有的,需要手动的复制至备库。查询语句如下:

SQL> select distinct thread#,max(sequence#) over(partition by thread#) a from v$archived_log;

停止当前的RFS进程,并立即执行failover

SQL> alter database recover managed standby database finish force;

切换备库为主库,并打开数据库

SQL> alter database commit to switchover to primary;

SQL> alter database open;

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