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

oracle 11g dataguard，备库启动alter database open read only;

1、alter database open read only

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

2、sql>alter database recover managed standby database cancel;

Database altered.

3、sql>alter database open read only;

Database altered.

4、sql>alter database recover managed standby database using current logfile disconnect;

Database altered.

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