ORA-10485: Real-Time Query cannot be enabled while applying migration redo

情景：利用Dataguard滾動方式升級資料庫後，備庫應用redo報錯：ORA-10485

MRP0: Background Media Recovery terminated with error 10485
Errors in file /home/u01/app/diag/rdbms/orcl11g/ORCL/trace/ORCL_pr00_1644.trc:
ORA-10485: Real-Time Query cannot be enabled while applying migration redo.
Managed Standby Recovery not using Real Time Apply
Recovery interrupted!
MRP0: Background Media Recovery process shutdown (ORCL)

[oracle@app scripts]$ oerr ora 10485
10485, 00000, "Real-Time Query cannot be enabled while applying migration redo."
// *Cause: The Real-Time Query feature was enabled when an attempt was made
// to recover through migration redo generated during primary upgrades or
// downgrades.
// *Action: Close the standby database in order to recover through
// migration redo. Reenable the Real-Time Query feature afterwards.

原因：在應用migration redo的時候不能開啟實時查詢(即，在主庫進行升級時候，備庫不能開啟實時查詢）

解決方法：

shutdown immediate;

startup mount;

alter database recover managed standby database disconnect from session;

--待migration redo 相關的日誌應用了後再開啟實時apply

alter database recover managed standby database cancel;

alter database open;

alter database recover managed standby database using current logfile disconnect from session;