备库报ORA-10456错误

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本文记录了解决Oraclestandby数据库无法打开的问题过程。在尝试打开standby数据库时遇到ORA-10456错误，通过取消正在进行的媒体恢复会话并使用当前日志文件断开连接，成功解决了问题，使数据库恢复正常运行。

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ORA-10456: cannot open standby database; media recovery session may be in progress

SQL> select * from hr.aa;
select * from hr.aa
*
ERROR at line 1:
ORA-01219: database not open: queries allowed on fixed tables/views only

SQL> select name,open_mode from v$database;
NAME OPEN_MODE
--------- --------------------
NOIDA MOUNTED

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-10456: cannot open standby database; media recovery session may be in progress

SQL> alter database recover managed standby database cancel;
Database altered.

SQL> alter database open;
Database altered.

SQL> alter database recover managed standby database using current logfile disconnect ;
Database altered.