Data Guard主库转备库，在转回去

select name, open_mode, db_unique_name, database_role from v$database;

select STATUS, GAP_STATUS from V$ARCHIVE_DEST_STATUS where DEST_ID = 2;

select NAME, VALUE, DATUM_TIME from V$DATAGUARD_STATS;

select SWITCHOVER_STATUS from V$DATABASE;

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

startup mount;

select SWITCHOVER_STATUS from V$DATABASE;

alter database commit to switchover to primary with session shutdown;

alter database open;

select name, open_mode, db_unique_name, database_role from v$database;

alter database recover managed standby database disconnect;

检查是否成功
Archive log list;

select process,status,sequence# from v$managed_standby;

Alter system switch logfile;


在切换回去

select database_role from v$database;

select database_role from v$database;

select SWITCHOVER_STATUS from V$DATABASE;

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

select SWITCHOVER_STATUS from V$DATABASE;

alter database commit to switchover to primary with session shutdown;

alter database open;

alter database recover managed standby database disconnect;