Oracle RAC 11g DG Broker配置和测试
之前在《RHEL6.4 + Oracle 11g DG测试环境快速搭建参考》已经简单说过。
本篇在实验环境中实际配置
环境： RHEL 6.5 + Oracle 11.2.0.4 GI、DB + Primary RAC（2 nodes）+ Standby RAC（2 nodes）
该实验环境的搭建可参考：模拟生产搭建Standby RAC实验环境(11.2.0.4 DG)
配置并测试DG Broker步骤：
1.停止MRP
在备库停止MRP：
alter database recover managed standby database cancel;
2.修改 Listener.ora 文件
在各个节点grid用户的监听文件中，[grid@jyrac1 ~]$ cd $ORACLE_HOME/network/admin
[grid@jyrac1 admin]$ vi listener.ora
分别增加以下内容：
--Primary Node1
SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME=jyzhao1)(GLOBAL_DBNAME=jyzhao_dgmgrl)(ORACLE_HOME=/opt/app/oracle/product/11.2.0/dbhome_1)))
--Primary Node2
SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME=jyzhao2)(GLOBAL_DBNAME=jyzhao_dgmgrl)(ORACLE_HOME=/opt/app/oracle/product/11.2.0/dbhome_1)))
--Standby Node1
SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME=jyzhao1)(GLOBAL_DBNAME=mynas_dgmgrl)(ORACLE_HOME=/opt/app/oracle/product/11.2.0/dbhome_1)))
--Standby Node2
SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME=jyzhao2)(GLOBAL_DBNAME=mynas_dgmgrl)(ORACLE_HOME=/opt/app/oracle/product/11.2.0/dbhome_1)))
注：因为我这里的环境之前没有配置其他的静态监听，而且默认使用的监听名字是LISTENER，所以，只需要直接添加这一行配置即可。
添加完毕后分别在各节点重新启动监听：
--@all nodes
lsnrctl stop
lsnrctl start
3.修改参数文件
检查当前DG_BROKER_CONFIG_FILE和dg_broker_start配置：
--ON Primary:
SYS@jyzhao1 >show parameter dg_broker
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dg_broker_config_file1 string /opt/app/oracle/product/11.2.0
/dbhome_1/dbs/dr1jyzhao.dat
dg_broker_config_file2 string /opt/app/oracle/product/11.2.0
/dbhome_1/dbs/dr2jyzhao.dat
dg_broker_start boolean FALSE
--ON Standby:
SQL> show parameter dg_broker
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dg_broker_config_file1 string /opt/app/oracle/product/11.2.0
/dbhome_1/dbs/dr1mynas.dat
dg_broker_config_file2 string /opt/app/oracle/product/11.2.0
/dbhome_1/dbs/dr2mynas.dat
dg_broker_start boolean FALSE
需要把DG Broker配置文件的默认路径修改到ASM磁盘上，并将dg_broker_start修改为TRUE，具体操作如下：
--ON Primary:
ASMCMD>
mkdir +fra1/jyzhao/DATAGUARDCONFIG
mkdir +data1/jyzhao/DATAGUARDCONFIG
SQL>
ALTER SYSTEM SET DG_BROKER_CONFIG_FILE1='+fra1/jyzhao/DATAGUARDCONFIG/dgb_config1.ora' SCOPE=BOTH sid='*';
ALTER SYSTEM SET DG_BROKER_CONFIG_FILE2='+data1/jyzhao/DATAGUARDCONFIG/dgb_config2.ora' SCOPE=BOTH sid='*';
alter system set dg_broker_start=true scope=both sid='*';
show parameter dg_broker
--ON Standby:
ASMCMD>
mkdir +fra/mynas/DATAGUARDCONFIG
mkdir +data/mynas/DATAGUARDCONFIG
SQL>
ALTER SYSTEM SET DG_BROKER_CONFIG_FILE1='+fra/mynas/DATAGUARDCONFIG/dgb_config1.ora' SCOPE=BOTH sid='*';
ALTER SYSTEM SET DG_BROKER_CONFIG_FILE2='+data/mynas/DATAGUARDCONFIG/dgb_config2.ora' SCOPE=BOTH sid='*';
alter system set dg_broker_start=true scope=both sid='*';
show parameter dg_broker
此时，主备库的alert告警日志中都会有启动DG Broker的信息：
Sun Aug 13 16:45:27 2017
DMON started with pid=41, OS id=7432
Starting Data Guard Broker (DMON)
Sun Aug 13 16:45:49 2017
INSV started with pid=54, OS id=7459
4.创建配置
dgmgrl sys/oracle 在dgmgrl下创建配置：CREATE CONFIGURATION 'jydb' AS PRIMARY DATABASE IS 'jyzhao' CONNECT IDENTIFIER IS 'jyzhao';
ADD DATABASE 'mynas' AS CONNECT IDENTIFIER IS 'mynas';
实际操作如下：
DGMGRL> CREATE CONFIGURATION 'jydb' AS PRIMARY DATABASE IS 'jyzhao' CONNECT IDENTIFIER IS 'jyzhao';
Configuration "jydb" created with primary database "jyzhao"
DGMGRL> ADD DATABASE 'mynas' AS CONNECT IDENTIFIER IS 'mynas';
Database "mynas" added
5.启用配置
在dgmgrl下启用配置，查看配置：enable configuration;
show configuration;
show database verbose jyzhao
实际操作如下：
DGMGRL> enable configuration;
Enabled.
DGMGRL> show configuration;
Configuration - jydb
Protection Mode: MaxPerformance
Databases:
jyzhao - Primary database
mynas - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
DGMGRL> show database verbose jyzhao
Database - jyzhao
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
jyzhao1
jyzhao2
Properties:
DGConnectIdentifier = 'jyzhao'
ObserverConnectIdentifier = ''
LogXptMode = 'ASYNC'
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
MaxConnections = '1'
ReopenSecs = '300'
NetTimeout = '30'
RedoCompression = 'DISABLE'
LogShipping = 'ON'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyParallel = 'AUTO'
StandbyFileManagement = 'AUTO'
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '4'
LogArchiveMinSucceedDest = '1'
DbFileNameConvert = '+data/mynas, +data1/jyzhao'
LogFileNameConvert = '+data/mynas, +data1/jyzhao, +fra/mynas, +fra1/jyzhao'
FastStartFailoverTarget = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
SendQEntries = '(monitor)'
LogXptStatus = '(monitor)'
RecvQEntries = '(monitor)'
ApplyLagThreshold = '0'
TransportLagThreshold = '0'
TransportDisconnectedThreshold = '30'
SidName(*)
StaticConnectIdentifier(*)
StandbyArchiveLocation(*)
AlternateLocation(*)
LogArchiveTrace(*)
LogArchiveFormat(*)
TopWaitEvents(*)
(*) - Please check specific instance for the property value
Database Status:
SUCCESS
DGMGRL>
附一些常用的命令汇总：
show configuration;
show database jyzhao;
show database mynas;
show database verbose jyzhao;
show database verbose mynas;
show instance verbose jyzhao1 on database jyzhao;
show instance verbose jyzhao2 on database jyzhao;
show instance verbose jyzhao1 on database mynas;
show instance verbose jyzhao2 on database mynas;
这些常用命令的输出结果大家可以在自己的实验环境测试一下，我这里就不赘述了。
6.切换测试
我们配置DG Broker主要就是为了方便切换，在配置正确的环境中，只需要一条命令就可以switchover成功。 在dgmgrl下切换测试：--一条命令完成switchover主备切换：
switchover to mynas;
--一条命令完成switchover主备切回：
switchover to jyzhao;
来看看实际DG Broker的强大功能,以主备切换为例：
[oracle@jyrac1 ~]$ dgmgrl sys/oracle
DGMGRL for Linux: Version 11.2.0.4.0 - 64bit Production
Copyright (c) 2000, 2009, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
Connected.
DGMGRL> switchover to mynas;
Performing switchover NOW, please wait...
Operation requires a connection to instance "jyzhao2" on database "mynas"
Connecting to instance "jyzhao2"...
Connected.
New primary database "mynas" is opening...
Operation requires startup of instance "jyzhao1" on database "jyzhao"
Starting instance "jyzhao1"...
ORACLE instance started.
Database mounted.
Database opened.
Switchover succeeded, new primary is "mynas"
整个过程一条简单命令实现，这相当于我之前手工切换《Oracle 11g DG手工switchover切换标准化流程》做的所有功能。
有了配置正确的DG Broker，老板再也不用担心员工去switchover切换搞的手忙脚乱了哈~