【测试】手工搭建DG

前言：（一）准备工作：

1.数据库要处于归档模式；

2.监听参数：local_listener 默认值为空--1521

3.关闭闪回（可能会触发数据库的bug，备库不能开闪回）

4.如果有外部表，外部表要删除。

（二）环境描述：

192.168.206.8 主库 ORA11GR2

192.168.206.9 备库 SBDB

一，将数据库处于归档模式：

SQL> alter database archivelog;

Database altered.

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            /u01/app/oracle/product/11.2.0/dbhome_1/dbs/arch

Oldest online log sequence     5

Next log sequence to archive   7

Current log sequence           7

二，查看本地监听，默认值为空：

SQL> show parameter local_listener;

NAME                                 TYPE        VALUE

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

local_listener                       string

三，关闪回（可能会触发数据库bug，备库不能开闪回）

查看显示关闭：

SQL> select flashback_on from v$database;

FLASHBACK_ON

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

NO

四，生成一个文本参数文件修改参数文件：

SQL> create pfile from spfile;

File created.

[oracle@host08 ~]$ cd $ORACLE_HOME/dbs

[oracle@host08 dbs]$ ls

hc_ORA11GR2.dat  init.ora  initORA11GR2.ora  lkORA11GR2  orapwORA11GR2  spfileORA11GR2.ora

[oracle@host08 dbs]$ vi initORA11GR2.ora

（将一下参数加入）

DB_NAME=ORA11GR2

DB_UNIQUE_NAME=ORA11GR2

LOG_ARCHIVE_CONFIG='DG_CONFIG=(ORA11GR2,SBDB)'

CONTROL_FILES='/u01/app/oracle/oradata/ORA11GR2/control01.ctl','/u01/app/oracle/oradata/ORA11GR2/control02.ctl'

LOG_ARCHIVE_DEST_1=

 'LOCATION=/u01/arch1/ORA11GR2/

  VALID_FOR=(ALL_LOGFILES,ALL_ROLES)

  DB_UNIQUE_NAME=ORA11GR2'

LOG_ARCHIVE_DEST_2=

 'SERVICE=SBDB ASYNC

  VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)

  DB_UNIQUE_NAME=SBDB'

LOG_ARCHIVE_DEST_STATE_1=ENABLE

LOG_ARCHIVE_DEST_STATE_2=ENABLE

REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE

LOG_ARCHIVE_FORMAT=%t_%s_%r.arc

LOG_ARCHIVE_MAX_PROCESSES=30

FAL_SERVER=SBDB

DB_FILE_NAME_CONVERT='SBDB','ORA11GR2'

LOG_FILE_NAME_CONVERT=

 '/u01/app/oracle/oradata/SBDB/','/u01/app/oracle/oradata/ORA11GR2/'

STANDBY_FILE_MANAGEMENT=AUTO

创建参数中涉及到的目录：

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle/admin/ORA11GR2/adump

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle/oradata/ORA11GR2/

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle/oradata/ORA11GR2/

[oracle@host08 dbs]$ mkdir -p /u01/arch1/ORA11GR2/

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle/oradata/SBDB/

[oracle@host08 dbs]$ mkdir -p /u01/app/oracle/oradata/ORA11GR2/

五，开启force logging

SQL> alter database FORCE LOGGING;

Database altered.

SQL> select FORCE_LOGGING from v$database;

FOR

---

YES

六，查看日志文件及大小，并增加standby logfile：

SQL> select GROUP#,MEMBER from v$logfile;

    GROUP# MEMBER

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

         3 /u01/app/oracle/oradata/ORA11GR2/redo03.log

         2 /u01/app/oracle/oradata/ORA11GR2/redo02.log

         1 /u01/app/oracle/oradata/ORA11GR2/redo01.log

SQL> alter database add standby logfile group 4('/u01/app/oracle/oradata/ORA11GR2/redo401_std.log','/u01/app/oracle/oradata/ORA11GR2/redo402_std.log') size 50M;

Database altered.

SQL> c/4/5

  1* alter database add standby logfile group 5('/u01/app/oracle/oradata/ORA11GR2/redo401_std.log','/u01/app/oracle/oradata/ORA11GR2/redo402_std.log') size 50M

SQL> c/4/5

  1* alter database add standby logfile group 5('/u01/app/oracle/oradata/ORA11GR2/redo501_std.log','/u01/app/oracle/oradata/ORA11GR2/redo402_std.log') size 50M

SQL> c/4/5

  1* alter database add standby logfile group 5('/u01/app/oracle/oradata/ORA11GR2/redo501_std.log','/u01/app/oracle/oradata/ORA11GR2/redo502_std.log') size 50M

SQL> /

Database altered.

SQL> c/5/6

  1* alter database add standby logfile group 6('/u01/app/oracle/oradata/ORA11GR2/redo501_std.log','/u01/app/oracle/oradata/ORA11GR2/redo502_std.log') size 50M

SQL> c/5/6

  1* alter database add standby logfile group 6('/u01/app/oracle/oradata/ORA11GR2/redo601_std.log','/u01/app/oracle/oradata/ORA11GR2/redo502_std.log') size 50M

SQL> c/5/6

  1* alter database add standby logfile group 6('/u01/app/oracle/oradata/ORA11GR2/redo601_std.log','/u01/app/oracle/oradata/ORA11GR2/redo602_std.log') size 50M

SQL> /

Database altered.

SQL> c/6/7

  1* alter database add standby logfile group 7('/u01/app/oracle/oradata/ORA11GR2/redo601_std.log','/u01/app/oracle/oradata/ORA11GR2/redo602_std.log') size 50M

SQL> c/6/7

  1* alter database add standby logfile group 7('/u01/app/oracle/oradata/ORA11GR2/redo701_std.log','/u01/app/oracle/oradata/ORA11GR2/redo602_std.log') size 50M

SQL> c/6/7

  1* alter database add standby logfile group 7('/u01/app/oracle/oradata/ORA11GR2/redo701_std.log','/u01/app/oracle/oradata/ORA11GR2/redo702_std.log') size 50M

SQL> /

Database altered.

SQL> select GROUP#,MEMBER from v$logfile;

    GROUP# MEMBER

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

         3 /u01/app/oracle/oradata/ORA11GR2/redo03.log

         2 /u01/app/oracle/oradata/ORA11GR2/redo02.log

         1 /u01/app/oracle/oradata/ORA11GR2/redo01.log

         4 /u01/app/oracle/oradata/ORA11GR2/redo401_std.log

         4 /u01/app/oracle/oradata/ORA11GR2/redo402_std.log

         5 /u01/app/oracle/oradata/ORA11GR2/redo501_std.log

         5 /u01/app/oracle/oradata/ORA11GR2/redo502_std.log

         6 /u01/app/oracle/oradata/ORA11GR2/redo601_std.log

         6 /u01/app/oracle/oradata/ORA11GR2/redo602_std.log

         7 /u01/app/oracle/oradata/ORA11GR2/redo701_std.log

         7 /u01/app/oracle/oradata/ORA11GR2/redo702_std.log

11 rows selected.

七，将主库参数文件和口令文件传给备库：

[oracle@host08 dbs]$ ls

hc_ORA11GR2.dat  init.ora  initORA11GR2.ora  lkORA11GR2  orapwORA11GR2  spfileORA11GR2.ora

[oracle@host08 dbs]$ scp initORA11GR2.ora orapwORA11GR2 192.168.206.9:/u01/app/oracle/product/11.2.0/dbhome_1/dbs

The authenticity of host '192.168.206.9 (192.168.206.9)' can't be established.

RSA key fingerprint is 3b:3d:b7:e2:77:91:2d:27:57:87:96:96:b6:56:d2:1e.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.206.9' (RSA) to the list of known hosts.

oracle@192.168.206.9's password:

initORA11GR2.ora                                                                                                                     100% 1610     1.6KB/s   00:00

orapwORA11GR2                                                                                                                        100% 1536     1.5KB/s   00:00

八，修改备库参数文件：（此时备库的DB_NAME 应该跟主库一致）

DB_NAME=ORA11GR2

DB_UNIQUE_NAME=SBDB

LOG_ARCHIVE_CONFIG='DG_CONFIG=(SBDB,ORA11GR2)'

CONTROL_FILES='/u01/app/oracle/oradata/SBDB/control01.ctl','/u01/app/oracle/oradata/SBDB/control02.ctl'

LOG_ARCHIVE_DEST_1=

 'LOCATION=/u01/arch1/SBDB/

  VALID_FOR=(ALL_LOGFILES,ALL_ROLES)

  DB_UNIQUE_NAME=SBDB'

LOG_ARCHIVE_DEST_2=

 'SERVICE=ORA11GR2 ASYNC

  VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)

  DB_UNIQUE_NAME=ORA11GR2'

LOG_ARCHIVE_DEST_STATE_1=ENABLE

LOG_ARCHIVE_DEST_STATE_2=ENABLE

REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE

LOG_ARCHIVE_FORMAT=%t_%s_%r.arc

LOG_ARCHIVE_MAX_PROCESSES=30

FAL_SERVER=ORA11GR2

DB_FILE_NAME_CONVERT='ORA11GR2','SBDB'

LOG_FILE_NAME_CONVERT=

 '/u01/app/oracle/oradata/ORA11GR2/','/u01/app/oracle/oradata/SBDB/'

STANDBY_FILE_MANAGEMENT=AUTO

九，创建参数中涉及到的目录：

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle/admin/SBDB/adump

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle/oradata/SBDB/

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle/oradata/SBDB/

[oracle@host09 dbs]$ mkdir -p /u01/arch1/SBDB/

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle/oradata/ORA11GR2/

[oracle@host09 dbs]$ mkdir -p /u01/app/oracle/oradata/SBDB/

十，配置网络监听：

主库：

①[oracle@host08 admin]$ vi listener.ora 

# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora

# Generated by Oracle configuration tools.

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = host08)(PORT = 1521))

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))

    )

  )

ADR_BASE_LISTENER = /u01/app/oracle

SID_LIST_LISTENER=

   (SID_LIST=

       (SID_DESC=

          (GLOBAL_DBNAME=ORA11GR2)

          (SID_NAME=ORA11GR2)

          (ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1)

        )

    )

②[oracle@host08 admin]$ vi tnsnames.ora 

SBDB=

  (DESCRIPTION=

     (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.206.9)(PORT=1521))

    (CONNECT_DATA=

     (SERVER=DEDICATED)

     (SERVICE_NAME=SBDB)

    )

  )

③查看状态并验证是否ping通：

LSNRCTL> status

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=host08)(PORT=1521)))

STATUS of the LISTENER

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

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production

Start Date                24-OCT-2016 11:17:20

Uptime                    0 days 0 hr. 0 min. 49 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora

Listener Log File         /u01/app/oracle/diag/tnslsnr/host08/listener/alert/log.xml

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=host08)(PORT=1521)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))

Services Summary...

Service "ORA11GR2" has 1 instance(s).

  Instance "ORA11GR2", status UNKNOWN, has 1 handler(s) for this service...

The command completed successfully

[oracle@host08 admin]$ tnsping SBDB

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 24-OCT-2016 11:23:18

Copyright (c) 1997, 2013, Oracle.  All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias

Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.206.9)(PORT=1521)) (CONNECT_DATA= (SERVER=DEDICATED) (SERVICE_NAME=SBDB)))

OK (10 msec)

[oracle@host08 admin]$ sqlplus sys/oracle@SBDB as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Mon Oct 24 11:23:37 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL>

备库：

①[oracle@host09 admin]$ vi listener.ora

# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora

# Generated by Oracle configuration tools.

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = host09)(PORT = 1521))

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))

    )

  )

ADR_BASE_LISTENER = /u01/app/oracle

SID_LIST_LISTENER=

   (SID_LIST=

       (SID_DESC=

          (GLOBAL_DBNAME=SBDB)

          (SID_NAME=SBDB)

          (ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1)

        )

)

②[oracle@host09 admin]$ vi tnsnames.ora 

ORA11GR2=

  (DESCRIPTION=

     (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.206.8)(PORT=1521))

    (CONNECT_DATA=

     (SERVER=DEDICATED)

     (SERVICE_NAME=ORA11GR2)

    )

  )

③查看状态并验证是否ping通：

LSNRCTL> status

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=host09)(PORT=1521)))

STATUS of the LISTENER

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

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 11.2.0.4.0 - Production

Start Date                24-OCT-2016 11:17:47

Uptime                    0 days 0 hr. 7 min. 0 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora

Listener Log File         /u01/app/oracle/diag/tnslsnr/host09/listener/alert/log.xml

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=host09)(PORT=1521)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))

Services Summary...

Service "SBDB" has 1 instance(s).

  Instance "SBDB", status UNKNOWN, has 1 handler(s) for this service...

The command completed successfully

oracle@host09 admin]$ tnsping ORA11GR2

TNS Ping Utility for Linux: Version 11.2.0.4.0 - Production on 24-OCT-2016 11:25:09

Copyright (c) 1997, 2013, Oracle.  All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias

Attempting to contact (DESCRIPTION= (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.206.8)(PORT=1521)) (CONNECT_DATA= (SERVER=DEDICATED) (SERVICE_NAME=ORA11GR2)))

OK (10 msec)

[oracle@host09 admin]$ sqlplus sys/oracle@ORA11GR2 as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Mon Oct 24 11:25:45 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>

十一，复制主库生成备库：

①此时将备库起到nmount状态

SQL> startup nomount

ORACLE instance started.

Total System Global Area  830930944 bytes

Fixed Size                  2257800 bytes

Variable Size             536874104 bytes

Database Buffers          285212672 bytes

Redo Buffers                6586368 bytes
②根据pfile创建spfile：

SQL> create pfile from spfile;

File created.

③生成备库：

[oracle@host08 admin]$ rman target / auxiliary sys/oracle@SBDB

Recovery Manager: Release 11.2.0.4.0 - Production on Mon Oct 24 11:32:11 2016

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

connected to target database: ORA11GR2 (DBID=242597878)

connected to auxiliary database: ORA11GR2 (not mounted)

RMAN> duplicate target database for standby from active database;

Starting Duplicate Db at 24-OCT-16

using target database control file instead of recovery catalog

allocated channel: ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: SID=10 device type=DISK

contents of Memory Script:

{

   backup as copy reuse

   targetfile  '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/orapwORA11GR2' auxiliary format

 '/u01/app/oracle/product/11.2.0/dbhome_1/dbs/orapwSBDB'   ;

}

executing Memory Script

Starting backup at 24-OCT-16

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=22 device type=DISK

Finished backup at 24-OCT-16

contents of Memory Script:

{

   backup as copy current controlfile for standby auxiliary format  '/u01/app/oracle/oradata/SBDB/control01.ctl';

   restore clone controlfile to  '/u01/app/oracle/oradata/SBDB/control02.ctl' from

 '/u01/app/oracle/oradata/SBDB/control01.ctl';

}

executing Memory Script

Starting backup at 24-OCT-16

using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile copy

copying standby control file

output file name=/u01/app/oracle/product/11.2.0/dbhome_1/dbs/snapcf_ORA11GR2.f tag=TAG20161024T113255 RECID=2 STAMP=926076778

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07

Finished backup at 24-OCT-16

Starting restore at 24-OCT-16

using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: copied control file copy

Finished restore at 24-OCT-16

contents of Memory Script:

{

   sql clone 'alter database mount standby database';

}

executing Memory Script

sql statement: alter database mount standby database

contents of Memory Script:

{

   set newname for tempfile  1 to

 "/u01/app/oracle/oradata/SBDB/temp01.dbf";

   switch clone tempfile all;

   set newname for datafile  1 to

 "/u01/app/oracle/oradata/SBDB/system01.dbf";

   set newname for datafile  2 to

 "/u01/app/oracle/oradata/SBDB/sysaux01.dbf";

   set newname for datafile  3 to

 "/u01/app/oracle/oradata/SBDB/undotbs01.dbf";

   set newname for datafile  4 to

 "/u01/app/oracle/oradata/SBDB/users01.dbf";

   set newname for datafile  5 to

 "/u01/app/oracle/oradata/SBDB/example01.dbf";

   backup as copy reuse

   datafile  1 auxiliary format

 "/u01/app/oracle/oradata/SBDB/system01.dbf"   datafile

 2 auxiliary format

 "/u01/app/oracle/oradata/SBDB/sysaux01.dbf"   datafile

 3 auxiliary format

 "/u01/app/oracle/oradata/SBDB/undotbs01.dbf"   datafile

 4 auxiliary format

 "/u01/app/oracle/oradata/SBDB/users01.dbf"   datafile

 5 auxiliary format

 "/u01/app/oracle/oradata/SBDB/example01.dbf"   ;

   sql 'alter system archive log current';

}

executing Memory Script

executing command: SET NEWNAME

renamed tempfile 1 to /u01/app/oracle/oradata/SBDB/temp01.dbf in control file

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting backup at 24-OCT-16

using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile copy

input datafile file number=00001 name=/u01/app/oracle/oradata/ORA11GR2/system01.dbf

output file name=/u01/app/oracle/oradata/SBDB/system01.dbf tag=TAG20161024T113314

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:45

channel ORA_DISK_1: starting datafile copy

input datafile file number=00002 name=/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

output file name=/u01/app/oracle/oradata/SBDB/sysaux01.dbf tag=TAG20161024T113314

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:35

channel ORA_DISK_1: starting datafile copy

input datafile file number=00005 name=/u01/app/oracle/oradata/ORA11GR2/example01.dbf

output file name=/u01/app/oracle/oradata/SBDB/example01.dbf tag=TAG20161024T113314

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:01:05

channel ORA_DISK_1: starting datafile copy

input datafile file number=00003 name=/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf

output file name=/u01/app/oracle/oradata/SBDB/undotbs01.dbf tag=TAG20161024T113314

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15

channel ORA_DISK_1: starting datafile copy

input datafile file number=00004 name=/u01/app/oracle/oradata/ORA11GR2/users01.dbf

output file name=/u01/app/oracle/oradata/SBDB/users01.dbf tag=TAG20161024T113314

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:04

Finished backup at 24-OCT-16

sql statement: alter system archive log current

contents of Memory Script:

{

   switch clone datafile all;

}

executing Memory Script

datafile 1 switched to datafile copy

input datafile copy RECID=2 STAMP=926077082 file name=/u01/app/oracle/oradata/SBDB/system01.dbf

datafile 2 switched to datafile copy

input datafile copy RECID=3 STAMP=926077082 file name=/u01/app/oracle/oradata/SBDB/sysaux01.dbf

datafile 3 switched to datafile copy

input datafile copy RECID=4 STAMP=926077082 file name=/u01/app/oracle/oradata/SBDB/undotbs01.dbf

datafile 4 switched to datafile copy

input datafile copy RECID=5 STAMP=926077082 file name=/u01/app/oracle/oradata/SBDB/users01.dbf

datafile 5 switched to datafile copy

input datafile copy RECID=6 STAMP=926077082 file name=/u01/app/oracle/oradata/SBDB/example01.dbf

Finished Duplicate Db at 24-OCT-16

（11）备库起到open：

SQL> startup

ORACLE instance started.

Total System Global Area  830930944 bytes

Fixed Size                  2257800 bytes

Variable Size             536874104 bytes

Database Buffers          285212672 bytes

Redo Buffers                6586368 bytes

Database mounted.

Database opened.

应用日志：

SQL> recover managed standby database using current logfile disconnect from session;

Media recovery complete.

SQL> recover managed standby database cancel;

Media recovery complete.

（11）查看主库切换状态：

SQL> select switchover_status from v$database;

SWITCHOVER_STATUS

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

TO STANDBY

（12）查看备库切换状态：

SQL> select switchover_status from v$database;

SWITCHOVER_STATUS

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

NOT ALLOWED

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