dg切換操作文件

SQL> SELECT TO_CHAR(STANDBY_BECAME_PRIMARY_SCN) FROM V$DATABASE;

TO_CHAR(STANDBY_BECAME_PRIMARY_SCN)

----------------------------------------

SQL> alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';

Session altered.

SQL> select oldest_flashback_scn,oldest_flashback_time from v$flashback_database_log;

OLDEST_FLASHBACK_SCN OLDEST_FLASHBACK_TI

-------------------- -------------------

    1202090 2019-05-05 04:01:45

SQL> recover managed standby database cancel;

Media recovery complete.

SQL> 

SQL> 

SQL> recover managed standby database finish force;

Media recovery complete.

SQL> select database_role from v$database;

DATABASE_ROLE

----------------

PHYSICAL STANDBY

SQL> select open_mode,database_role,protection_mode,protection_level,switchover_status from v$database;

OPEN_MODE     DATABASE_ROLE    PROTECTION_MODE   PROTECTION_LEVEL SWITCHOVER_STATUS

-------------------- ---------------- -------------------- -------------------- --------------------

READ ONLY     PHYSICAL STANDBY MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE TO PRIMARY

SQL> alter database commit to switchover to primary;

Database altered

SQL> 

SQL> select open_mode,database_role,protection_mode,protection_level,switchover_status from v$database;

OPEN_MODE     DATABASE_ROLE    PROTECTION_MODE   PROTECTION_LEVEL SWITCHOVER_STATUS

-------------------- ---------------- -------------------- -------------------- --------------------

MOUNTED     PRIMARY      MAXIMUM PERFORMANCE  UNPROTECTED NOT ALLOWED

SQL> SELECT TO_CHAR(STANDBY_BECAME_PRIMARY_SCN) FROM V$DATABASE;

TO_CHAR(STANDBY_BECAME_PRIMARY_SCN)

----------------------------------------

1330559

SQL> alter database open;

Database altered.

SQL> select open_mode,database_role,protection_mode,protection_level,switchover_status from v$database;

OPEN_MODE     DATABASE_ROLE    PROTECTION_MODE   PROTECTION_LEVEL SWITCHOVER_STATUS

-------------------- ---------------- -------------------- -------------------- --------------------

READ WRITE     PRIMARY      MAXIMUM PERFORMANCE  MAXIMUM PERFORMANCE NOT ALLOWED

SQL> SELECT TO_CHAR(STANDBY_BECAME_PRIMARY_SCN) FROM V$DATABASE;

TO_CHAR(STANDBY_BECAME_PRIMARY_SCN)

----------------------------------------

1330559

SQL> 

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