dataguard rac到单机之间的switch over

搭建参见文章http://snowhill.blog.51cto.com/339421/1923591,搭好后，做switch over:

1 检查参数fal_server,fal_client,log_archive_dest_2,log_file_name_convert,data_file_name_convert,

standby_file_management

源：

fal_server=standby

fal_cleint=db

alter system set db_file_name_convert='/data','+data' scope=spfile;alter system set log_file_name_convert='/data','+data' scope=spfile;

standby:

fal_server=db

fal_client=standby

standby_file_management=auto

2 切换前rac需关闭至一个实例

3 检查是否有gap

4 切换：

源：

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

这里切换后，源端全自动shutdown abort;

--standby

SQL>select name,open_mode,DATABASE_ROLE,PROTECTION_MODE,switchover_status from v$database;NAME      OPEN_MODE            DATABASE_ROLE    PROTECTION_MODE      SWITCHOVER_STATUS--------- -------------------- ---------------- -------------------- --------------------DB        READ ONLY WITH APPLY PHYSICAL STANDBY MAXIMUM AVAILABILITY TO PRIMARY

SQL>alter system set log_archive_dest_2="service=db lgwr sync affirm valid_for=(all_logfiles,all_roles) db_unique_name=db" scope=both;SQL>alter system set log_archive_dest_state_2=enable;SQL>alter database commit to switchover to primary with session shutdown;

--源

SQL>startup mountSQL>alter system set log_archive_dest_state_2=defer;SQL>select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$databaseNAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME--------- ------------ -------------------- ---------------- -------------------- ------------------------------DB        ARCHIVELOG   MOUNTED              PHYSICAL STANDBY RECOVERY NEEDED      dbSQL> alter database recover managed standby database cancel;SQL> alter database  open;SQL>  alter database recover managed standby database using current logfile disconnect;SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database; NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME--------- ------------ -------------------- ---------------- -------------------- ------------------------------DB        ARCHIVELOG   READ ONLY WITH APPLY PHYSICAL STANDBY TO PRIMARY           db

--standby

SQL>alter system set log_archive_dest_2="service=db lgwr sync affirm valid_for=(all_logfiles,all_roles) db_unique_name=db" scope=both;

SQL>alter system set log_archive_dest_state_2=enable scope=both;