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在物理DG主备库切换时遇到ORA-16139: media recovery required错误
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY
*
ERROR at line 1:
ORA-16139: media recovery required
解决办法：
--如果报ORA-16139: media recovery required，可能是由于未应用日志引起，可先执行
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
然后再执行该命令
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