公司所有的DG环境都用到了BROKER这个东西，今天我也在VM来测试一下这个玩意。不过听说在生产中用得比较少，不知道我们公司为什么全部上的这个东西。
测试环境：OS RedHat 5.6 X86_64 ,DB 11.2.0.2
DG的测试参考之前写的文章：Oracle 11GR2 搭建活动的物理DG/DataGuard (READ ONLY模式)http://www.linuxidc.com/Linux/2012-09/70101.htm
1，修改dg_broker_config_file参数。如果是在RAC环境中，这个把这个文件把到共享的存储上面，如果有ASM可以放到ASM中。
主库：
#这里跟官方给的名字有一点不一样htz1.dat这里官方要求是drc.dat，但是我这里也没有报错。 SQL> alter system set dg_broker_config_file1='/u01/app/oracle/oradata/htz/htz1.dat'; System altered. SQL> SQL> alter system set dg_broker_config_file2='/u01/app/oracle/oradata/htz/htz2.dat'; System altered.
备库：
SQL> alter system set dg_broker_config_file1='/u01/app/oracle/oradata/htz/htz1.dat'; System altered. SQL> alter system set dg_broker_config_file2='/u01/app/oracle/oradata/htz/htz2.dat'; System altered.
启用BROKER：
在两个数据库上面都执行：
SQL> alter system set dg_broker_start=true scope=both; System altered.
在其中任意一台做下面的操作就可以了，另它安装了client的客户端也是可以的.
[oracle@11g admin]$ dgmgrl
DGMGRL for Linux: Version 11.2.0.2.0 - 64bit Production
Copyright (c) 2000, 2009, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
#连接数据库
DGMGRL> connect sys/oracle@htz
Connected.
#help是帮忙命令，这点做得很好，不像sqlplus中。
DGMGRL> help create
Creates a broker configuration
Syntax:
CREATE CONFIGURATION AS
PRIMARY DATABASE IS
CONNECT IDENTIFIER IS ;
#创建一个配置文件，这里一定要记得是连接到当前的主数据库
DGMGRL> create configuration htz as primary database is htz connect identifier is htz;
Configuration "htz" created with primary database "htz"
#启用配置文件
DGMGRL> enable configuration;
Enabled.
#增加备库到配置文件中
DGMGRL> help add
Adds a standby database to the broker configuration
Syntax:
ADD DATABASE
[AS CONNECT IDENTIFIER IS ]
[MAINTAINED AS {PHYSICAL|LOGICAL}];
DGMGRL> add database htzb as connect identifier is htzb;
Database "htzb" added
#启用备库
DGMGRL> enable database htzb;
Enabled.
#查看配置文件
DGMGRL> show configuration
Configuration - htz
Protection Mode: MaxAvailability
Databases:
htz - Primary database
htzb - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
#查看某个数据库的配置消息，其中很多参数我们都可以在sqlplus修改的。
DGMGRL> show database verbose htz;
Database - htz
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
htz
Properties:
DGConnectIdentifier = 'htz'
ObserverConnectIdentifier = ''
LogXptMode = 'SYNC'
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
MaxConnections = '1'
ReopenSecs = '300'
NetTimeout = '30'
RedoCompression = 'DISABLE'
LogShipping = 'ON'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyParallel = 'AUTO'
StandbyFileManagement = 'MANUAL'
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '4'
LogArchiveMinSucceedDest = '1'
DbFileNameConvert = '/u01/app/oracle/oradata/htz/, /u01/app/oracle/oradata/htz/'
LogFileNameConvert = '/u01/app/oracle/oradata/htz/, /u01/app/oracle/oradata/htz/'
FastStartFailoverTarget = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
SendQEntries = '(monitor)'
LogXptStatus = '(monitor)'
RecvQEntries = '(monitor)'
SidName = 'htz'
#这里要注意了。broker里面的连接的service_name是_DGMGRL,因为我们
#静态监听中的GLOBAL_NAME是DB_UNIQUE_NAME，所以这里我们要修改StaticConnectIdentifier #不然在切换的时候会报错的。
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=11g)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=HTZ_DGMGRL)(INSTANCE_NAME=htz)(SERVER=DEDICATED)))'
StandbyArchiveLocation = '/u01/app/oracle/arch/htz/'
AlternateLocation = ''
LogArchiveTrace = '0'
LogArchiveFormat = '%t_%s_%r.dbf'
TopWaitEvents = '(monitor)'
Database Status:
SUCCESS
DGMGRL> show database verbose htzb;
Database - htzb
Role: PHYSICAL STANDBY
Intended State: APPLY-ON
Transport Lag: 0 seconds
Apply Lag: 0 seconds
Real Time Query: ON
Instance(s):
htz
Properties:
DGConnectIdentifier = 'htzb'
ObserverConnectIdentifier = ''
LogXptMode = 'SYNC'
DelayMins = '0'
Binding = 'OPTIONAL'
MaxFailure = '0'
MaxConnections = '1'
ReopenSecs = '300'
NetTimeout = '30'
RedoCompression = 'DISABLE'
LogShipping = 'ON'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyParallel = 'AUTO'
StandbyFileManagement = 'MANUAL'
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '4'
LogArchiveMinSucceedDest = '1'
DbFileNameConvert = '/u01/app/oracle/oradata/htz/, /u01/app/oracle/oradata/htz/'
LogFileNameConvert = '/u01/app/oracle/oradata/htz/, /u01/app/oracle/oradata/htz/'
FastStartFailoverTarget = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
SendQEntries = '(monitor)'
LogXptStatus = '(monitor)'
RecvQEntries = '(monitor)'
SidName = 'htz'
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=11gdg)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=HTZB_DGMGRL)(INSTANCE_NAME=htz)(SERVER=DEDICATED)))'
StandbyArchiveLocation = '/u01/app/oracle/arch/htz/'
AlternateLocation = ''
LogArchiveTrace = '0'
LogArchiveFormat = '%t_%s_%r.dbf'
TopWaitEvents = '(monitor)'
Database Status:
SUCCESS
修改StaticConnectIdentifier参数，记得两个数据库都要修改。
DGMGRL> edit database htz set property StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.100.30)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=htz)(INSTANCE_NAME=htz)(SERVER=DEDICATED)))'; Property "staticconnectidentifier" updated DGMGRL> edit database htzb set property StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.100.31)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=htzb)(INSTANCE_NAME=htz)(SERVER=DEDICATED)))'; Property "staticconnectidentifier" updated
开始切换：
DGMGRL> show configuration Configuration - htz Protection Mode: MaxAvailability Databases: #注意这里hta是主数据库 htz - Primary database htzb - Physical standby database Fast-Start Failover: DISABLED Configuration Status: SUCCESS #开始切换 DGMGRL> switchover to htzb; Performing switchover NOW, please wait... New primary database "htzb" is opening... Operation requires shutdown of instance "htz" on database "htz" Shutting down instance "htz"... ORACLE instance shut down. Operation requires startup of instance "htz" on database "htz" Starting instance "htz"... ORACLE instance started. Database mounted. Database opened. Switchover succeeded, new primary is "htzb" #查看状态 DGMGRL> show configuration; Configuration - htz Protection Mode: MaxAvailability Databases: #htzb已经切换成主数据库了，切换成功 htzb - Primary database htz - Physical standby database Fast-Start Failover: DISABLED Configuration Status: SUCCESS 