DataGuard - physical standby failover切换过程

1.failover前检查

#如果有多个standby数据库,查看哪个standby接收的redo最新。
SQL> select * from v$archive_dest_status;

#查看standby库接收到的最新的SCN
SQL> select thread#,sequence#,last_change#,last_time from v$standby_log;

   THREAD#  SEQUENCE# LAST_CHANGE# LAST_TIME
---------- ---------- ------------ --------------
         1       7128    126385274 25-4月 -16
         1          0            0
         1          0            0

SQL>

2.执行failover

#停止MRP(关闭主动应用)
SQL> alter database recover managed standby database cancel;

#重启启动MRP,完成redo应用(手动应用)。如果有gap,finish会fail。执行结束后,保护模式变成最大性能
SQL> alter database recover managed standby database finish;

SQL> alter database commit to switchover to primary with session shutdown;
SQL> alter database open;
时间: 2024-10-01 07:58:05

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