## 启动备库

STARTUP MOUNT;

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

或，如果使用实时同步，则运行以下

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE;

## 关闭备库操作

查看是否正在应用redo data，如果存在MRP0或者MRP

SELECT PROCESS, STATUS FROM V$MANAGED_STANDBY;

关闭redo apply

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

关闭备库

SHUTDOWN IMMEDIATE;

## 状态查询

主库：

动态性能视图：

v$archive_dest_status

RECOVERY_MODE 列表示是否是实时Redo Data同步。

## 启动同步

前台

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE;

后台

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT;

实时

LTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE

## 停止同步

ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

## 监控Redo同步

主库或备库运行

SELECT DATABASE_ROLE, DB_UNIQUE_NAME INSTANCE, OPEN_MODE,PROTECTION_MODE, PROTECTION_LEVEL, SWITCHOVER_STATUS FROM V$DATABASE;

查看fast-start failover

SELECT FS_FAILOVER_STATUS FSFO_STATUS, FS_FAILOVER_CURRENT_TARGET TARGET_STANDBY, FS_FAILOVER_THRESHOLD THRESHOLD, FS_FAILOVER_OBSERVER_PRESENT OBS_PRES FROM V$DATABASE;

备库上执行，查看Redo apply和redo transport service 活动

SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY;

备库执行，通过查看ARCHIVED_SEQ#和APPLIED_SEQ#对比备库和主库差距。

SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$ARCHIVE_DEST_STATUS;

备库上执行，是实时同步还是普通同步

SELECT RECOVERY_MODE FROM V$ARCHIVE_DEST_STATUS WHERE DEST_ID=2 ;

备库上执行，用于查看收到的redo log file情况

SELECT REGISTRAR, CREATOR, THREAD#, SEQUENCE#, FIRST_CHANGE#, NEXT_CHANGE# FROM V$ARCHIVED_LOG;

备库上执行，查看已经被应用的archive log file.

SELECT THREAD#, SEQUENCE#, FIRST_CHANGE#, NEXT_CHANGE# FROM V$LOG_HISTORY;

主库上运行，查看DG相关的警报日志。

SELECT MESSAGE FROM V$DATAGUARD_STATUS;

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