以RW及只读模式打开物理standby数据库并恢复为打开前状态

一、用Read only方式打开standby db，做一些查询，然后恢复到打开前的状态(standby db的报表用途)。

在备库上进行操作。首先取消恢复应用

SYS@dg2>recover managed standby database cancel;

Media recovery complete.

SYS@dg2>alter database open;

Database altered.

SYS@dg2>select open_mode from v$database;

OPEN_MODE

--------------------
READ ONLY

SYS@dg2>conn bys/bys

Connected.

BYS@dg2>select * from tab;

TNAME                          TABTYPE  CLUSTERID

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

TEST                           TABLE

BYS@dg2>select * from test;

         A

----------

       999

       111

关闭并重新打开数据库到MOUNT状态，执行恢复应用：alter database recover managed standby database disconnect  from session;

二、用R/W方式打开standby数据库，创建一个对象，然后通过flashback database将standby db恢复到打开前的状态（standby db的应用测试用途）。

1.在dg2上打开闪回区：

SYS@dg2>startup mount;

ORACLE instance started.

Total System Global Area  418484224 bytes

Fixed Size                  1336932 bytes

Variable Size             281020828 bytes

Database Buffers          130023424 bytes

Redo Buffers                6103040 bytes

Database mounted.

SYS@dg2>alter database recover managed standby database disconnect from session;

Database altered.

SYS@dg2>alter database recover managed standby database cancel;

Database altered.

SYS@dg2>alter system set db_recovery_file_dest_size=2G;

System altered.

2.需要提前建好目录，设置好目录权限。

SYS@dg2>alter system set db_recovery_file_dest='/u01/flashback_log';

System altered.

SYS@dg2>select flashback_on from v$database;

FLASHBACK_ON

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

NO

SYS@dg2>alter database flashback on;

Database altered.

SYS@dg2>select flashback_on from v$database;

FLASHBACK_ON

------------------
YES

3.创建还原点，名字为bys0802

SYS@dg2>create restore point bys0802 guarantee flashback database;

Restore point created.

#################################################################
在dg1上操作

SYS@dg1>alter system archive log current;

System altered.

SYS@dg1>alter system set log_archive_dest_state_2=defer;

System altered.

#################################

4.在dg2上打开数据库为RW模式并在数据库中进行创建表等操作

SYS@dg2>alter database activate standby database;

Database altered.

SYS@dg2>alter database open;

Database altered.

SYS@dg2>select open_mode from v$database;

OPEN_MODE

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

READ WRITE

在dg2上建一个表：

SYS@dg2>conn bys/bys

Connected.

BYS@dg2>create table test1 as select * from test;

Table created.

BYS@dg2>select * from tab;

TNAME                          TABTYPE  CLUSTERID

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

TEST                           TABLE

TEST1                          TABLE

BYS@dg2>conn / as sysdba

Connected.

SYS@dg2>shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SYS@dg2>startup mount;

ORACLE instance started.

Total System Global Area  418484224 bytes

Fixed Size                  1336932 bytes

Variable Size             281020828 bytes

Database Buffers          130023424 bytes

Redo Buffers                6103040 bytes

Database mounted.

#############################################

4.闪回到上面设置的还原点，并转换为物理standby并打开应用--在MOUNT状态下

SYS@dg2>flashback database to restore point bys0802;

Flashback complete.

SYS@dg2>alter database convert to physical standby;

Database altered.

SYS@dg2>startup mount force;

ORACLE instance started.

Total System Global Area  418484224 bytes

Fixed Size                  1336932 bytes

Variable Size             281020828 bytes

Database Buffers          130023424 bytes

Redo Buffers                6103040 bytes

Database mounted.
SYS@dg2>alter database recover managed standby database disconnect from session;

Database altered.

################################################
在dg1上打开到归档目录2的日志

SYS@dg1>alter system set log_archive_dest_state_2=enable;

System altered.

#########################################

5.重新恢复备库为STANDBY后查询主备库日志应用状态：

dg1查询：

SYS@dg1>select protection_mode,database_role,protection_level from v$database;

PROTECTION_MODE      DATABASE_ROLE    PROTECTION_LEVEL

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

MAXIMUM AVAILABILITY PRIMARY          MAXIMUM AVAILABILITY

SYS@dg1>select open_mode from v$database;

OPEN_MODE

--------------------
READ WRITE

SYS@dg1>select max(sequence#) from v$archived_log;

MAX(SEQUENCE#)

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

            64

SYS@dg1>select sequence#,status,thread#,block# from v$managed_standby;

 SEQUENCE# STATUS          THREAD#     BLOCK#

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

        62 CLOSING               1          1

        58 CLOSING               1       2049

        55 CLOSING               1          1

        64 CLOSING               1          1

        65 WRITING               1       1470

SYS@dg1>select process,status from v$managed_standby;

PROCESS   STATUS

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

ARCH      CLOSING

ARCH      CLOSING

ARCH      CLOSING

ARCH      CLOSING

LGWR      WRITING

dg2查询：

SYS@dg2>select protection_mode,database_role,protection_level from v$database;

PROTECTION_MODE      DATABASE_ROLE    PROTECTION_LEVEL

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

MAXIMUM AVAILABILITY PHYSICAL STANDBY MAXIMUM AVAILABILITY

SYS@dg2>select open_mode from v$database;

OPEN_MODE

--------------------
MOUNTED

SYS@dg2>select max(sequence#) from v$archived_log;

MAX(SEQUENCE#)

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

            64

SYS@dg2>select sequence#,status,thread#,block# from v$managed_standby;

 SEQUENCE# STATUS          THREAD#     BLOCK#

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

        64 CLOSING               1          1

         0 CONNECTED             0          0

         0 CONNECTED             0          0

        63 CLOSING               1          1

        65 WAIT_FOR_LOG          1          0

        65 IDLE                  1       1233

         0 IDLE                  0          0

         0 IDLE                  0          0

         0 IDLE                  0          0