oracledg打开备库为读写数据库,慎重!

确保standby数据库置于flashback on 状态

--设置闪回恢复区

alter system set db_recovery_dest_size=2g;

alter system set db_recovery_file_dest='+DATA';

--取消备库的自动恢复状态

alter database recover managed standby database cancel;

--创建一个还原点

create restore point restore_point_test

--在主库归档当前日志,确保前一步创建还原点的scn的归档日志已经传到备库

alter system archive log current;

--将主库到备库的归档目的地状态设置为defer

alter system set log_archive_dest_state_2=defer;

--激活备库到read/write状态

alter database activate standby database;

alter database open;

--在备库上创建数据

create table t1 as select * from dba_objects where rownum<=10;

drop table t1;

--将数据库flashback回原来保存的还原点

startup mount force;

flashback database to restore point restore_point_test;

--转换成备库

alter database convert to physical standby;

--将备库至于自动恢复状态

startup mount force;

alter database recover managed;

--将主库到备库的归档目的地状设置为enable

alter system set log_archive_dest_state_2=enable;

--检查主库状态

select dest_name,status from v$archive_dest;

--检查备库状态

select process,status from managed_standby;

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