官方文件原文:
The COMPATIBLE database initialization parameter must be set to 11.0 or higher to use
the real-time query feature of the Active Data Guard option.
A physical standby database instance cannot be opened if Redo Apply is active on a
mounted instance of that database. Use the following SQL statements to stop Redo
Apply, open a standby instance read-only, and restart Redo Apply:
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
SQL> ALTER DATABASE OPEN;
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;

測試：（RAC的DG端每個節點都要執行）
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
MOUNTED
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
Database altered.
SQL> ALTER DATABASE OPEN;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ ONLY
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ ONLY WITH APPLY

Oracle 11g rac 的 active dataguard的啟動步驟

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