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Oracle11g 开启db broker实现管理dg的目的
保证两边都设置的如下几个参数：
1.SQL> alter system set LOG_ARCHIVE_DEST_1='LOCATION=/data/u01/app/oracle/archive/ VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=db1';
System altered.
2.SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_2='SERVICE=db1 LGWR aSYNC VALID_FOR=(ONLINE_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=db1';
System altered.
3.SQL> ALTER SYSTEM SET LOG_FILE_NAME_CONVERT='/data/u01/app/oracle/oradata/db2/', '/data/u01/app/oracle/oradata/db1/' scope =spfile;
System altered.
4.SQL> ALTER SYSTEM SET DB_FILE_NAME_CONVERT= '/data/u01/app/oracle/oradata/db2/', '/data/u01/app/oracle/oradata/db1/' scope =spfile;
System altered.
5.SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT=AUTO SCOPE=SPFILE;
System altered.
6.SQL> ALTER SYSTEM SET FAL_CLIENT = db1 SCOPE=SPFILE;
System altered.
7.SQL> ALTER SYSTEM SET FAL_SERVER = db2 SCOPE=SPFILE;
System altered.
8.主库备库添加了standby logfile
9. SQL> alter database force logging;
Database altered.
前提：主库db2 备库db1
一：开启db broker
在主备库上各设置为true
SQL> alter system set dg_broker_start=true;
主备库：参数dg_broker_config_file，默认即可!当你后面创建了configuration 并且enable之后
就会在这个目录下生成相应的文件!
SQL> show parameter dg_broker_config_file;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dg_broker_config_file1 string /data/u01/app/oracle/product/1
1.2.0/dbhome_1/dbs/dr1db2.dat
dg_broker_config_file2 string /data/u01/app/oracle/product/1
1.2.0/dbhome_1/dbs/dr2db2.dat
修改dg_broker_config_file参数。这里就用默认的路径，也可以自己指定。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。
二.主备库listener.ora添加db broker切换使用的监听服务，因为dg broker使用的服务名就是db_unique_name_DGMGRL，注：如果不修改监听利用原有的监听也是可以得，下面会介绍这种方法!
2.1 vim listener.ora,添加下面的红色部分!一定注意格式，严格对齐
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.9.21.178)(PORT = 1521))
)
)
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(GLOBAL_DBNAME=db2)
(ORACLE_HOME=/data/u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME=db2))
(SID_DESC=
(GLOBAL_DBNAME=db2_DGMGRL)
(ORACLE_HOME=/data/u01/app/oracle/product/11.2.0/dbhome_1)
(SID_NAME=db2)))
ADR_BASE_LISTENER = /data/u01/app/oracle
2.2 重新加载监听：
[oracle@beijing-fuli-hadoop-02 admin]$ lsnrctl reload
三.配置 db broker
3.1.连接主库
[oracle@beijing-fuli-hadoop-02 admin]$ dgmgrl sys/oracle@db2
3.2.创建配置
DGMGRL> help
The following commands are available:
add Adds a standby database to the broker configuration
connect Connects to an Oracle database instance
convert Converts a database from one type to another
create Creates a broker configuration
disable Disables a configuration, a database, or fast-start failover
edit Edits a configuration, database, or instance
enable Enables a configuration, a database, or fast-start failover
exit Exits the program
failover Changes a standby database to be the primary database
help Displays description and syntax for a command
quit Exits the program
reinstate Changes a database marked for reinstatement into a viable standby
rem Comment to be ignored by DGMGRL
remove Removes a configuration, database, or instance
show Displays information about a configuration, database, or instance
shutdown Shuts down a currently running Oracle database instance
sql Executes a SQL statement
start Starts the fast-start failover observer
startup Starts an Oracle database instance
stop Stops the fast-start failover observer
switchover Switches roles between a primary and standby database
DGMGRL> help create
Creates a broker configuration
Syntax:
CREATE CONFIGURATION
PRIMARY DATABASE IS
CONNECT IDENTIFIER IS
DGMGRL> CREATE CONFIGURATION dbha_c AS PRIMARY DATABASE IS db2 CONNECT IDENTIFIER IS db2;
(解释：其中 dbha_c是随便起的名字，db2是主的数据库唯一名，identifier is是tnsnames.ora的网络服务名! 然后可以使用如下来删除创建的configuration!
DGMGRL> REMOVE CONFIGURATION;)
3.3添加备库的信息
DGMGRL> help add
DGMGRL> add database 'db1' as connect identifier is 'db1' maintained as physical;
Database "db1" added
注意identifier is 'db1' 这里的db1是你tnsnames.ora里面关于备库的那个名字!
添加了之后
3.4启动这个db broker的CONFIGURATION!
DGMGRL> help enable
DGMGRL> ENABLE CONFIGURATION;
3.5查看db broker的的相关配置
DGMGRL> help show
DGMGRL> SHOW CONFIGURATION;
如下报错：
DGMGRL> show configuration
Configuration - dbha_c
Protection Mode: MaxPerformance
Databases:
db2 - Primary database
db1 - Physical standby database (disabled)
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
解决办法：
将主从库的这个目录下的文件删除，然后重新create configuration，即可!
SQL> show parameter dg_broker_config_file;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
dg_broker_config_file1 string /data/u01/app/oracle/product/1
1.2.0/dbhome_1/dbs/dr1db2.dat
dg_broker_config_file2 string /data/u01/app/oracle/product/1
1.2.0/dbhome_1/dbs/dr2db2.dat
解释：这两文件的作用?
如下显示代表正常!!!
DGMGRL> show configuration
Configuration - dbha_c
Protection Mode: MaxPerformance
Databases:
db2 - Primary database
db1 - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
查看数据库的状态：
DGMGRL> show database verbose db1;
#这里要注意了。broker里面的连接的service_name是
如果不修改监听文件的话，那也可以执行下面的命令来修改StaticConnectIdentifier:
DGMGRL>edit database db1 set property StaticConnectIdentifier= '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=beijing-fuli-hadoop-01)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=db1)(INSTANCE_NAME=db1)(SERVER=DEDICATED)))';
DGMGRL> edit database db2 set property StaticConnectIdentifier='(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=beijing-fuli-hadoop-02)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=db2)(INSTANCE_NAME=db2)(SERVER=DEDICATED)))';
四：关于db broker的相关命令：
4.1：切换主从!
DGMGRL> help switchover
DGMGRL> switchover to db1
Performing switchover NOW, please wait...
Operation requires a connection to instance "db1" on database "db1"
Connecting to instance "db1"...
Connected.
New primary database "db1" is opening...
Operation requires startup of instance "db2" on database "db2"
Starting instance "db2"...
ORACLE instance started.
Database mounted.
Database opened.
Switchover succeeded, new primary is "db1"
DGMGRL>
4.2：把从库切换成snapshot状态!(前提是开启了flashback database)
主库操作
DGMGRL> SHOW CONFIGURATION
DGMGRL> help convert
DGMGRL> CONVERT DATABASE db1 TO SNAPSHOT STANDBY;
DGMGRL> SHOW CONFIGURATION;
4.3: 修改下dg同步redo的方式，以及保护模式!
DGMGRL> help edit
DGMGRL> EDIT DATABASE db2 SET PROPERTY LogXptMode=SYNC; ---主库
DGMGRL> EDIT DATABASE db1 SET PROPERTY LogXptMode=SYNC; ---备库
DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MaxAvailability; ---主库
DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MaxAvailability; ---备库
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