问题描述：

Oracle 19 RAC+DG环境，有三个备节点，其中02备节点服务器宕机12个小时，恢复启动后02备节点同步异常。主节点上的archive log 只有当天的，之前的log已被清理。

主库上的日志状态：

SQL>  select group#,sequence#,status from v$log;

    GROUP#  SEQUENCE# STATUS
---------- ---------- ----------------
	 1	22639 CURRENT
	 2	22637 INACTIVE
	 3	22638 INACTIVE
	 4	22966 CURRENT
	 5	22964 INACTIVE
	 6	22965 INACTIVE

备库02上的同步时间点：

TO_CHAR(FIRST_TI DEL S
---------------- --- -
2024-06-16 13:19 NO  A
2024-06-16 13:48 NO  A
2024-06-16 14:12 NO  A
2024-06-16 14:24 NO  A
2024-06-16 15:16 NO  A
2024-06-16 15:37 NO  A
2024-06-16 16:16 NO  A
2024-06-16 16:51 NO  A
2024-06-16 17:09 NO  A
2024-06-16 17:37 NO  A
2024-06-16 17:48 NO  A

TO_CHAR(FIRST_TI DEL S
---------------- --- -
2024-06-16 18:40 NO  A

备库02上的进程状态：

SQL> select process,SEQUENCE#, status from v$managed_standby;

PROCESS    SEQUENCE# STATUS
--------- ---------- ------------
ARCH	       22966 CLOSING
DGRD		   0 ALLOCATED
DGRD		   0 ALLOCATED
ARCH		   0 CONNECTED
ARCH		   0 CONNECTED
ARCH		   0 CONNECTED
ARCH	       22635 CLOSING
MRP0	       22954 WAIT_FOR_GAP
RFS		   0 IDLE
RFS	       22967 IDLE
RFS		   0 IDLE

PROCESS    SEQUENCE# STATUS
--------- ---------- ------------
RFS	       22639 IDLE
RFS		   0 IDLE
RFS		   0 IDLE
RFS		   0 IDLE
RFS		   0 IDLE
RFS		   0 IDLE

17 rows selected.