现存一套ADG，现需添加一套级联备库作为远程数据中心灾备。

二、主备库修改参数

--1.主库修改参数
alter system set log_archive_config='dg_config=(orcl,orcladg,orclfar)' scope=both;
--2.备库修改参数
alter system set log_archive_config='dg_config=(orcl,orcladg,orclfar)' scope=both;
alter system set LOG_ARCHIVE_DEST_2= 'SERVICE=orclfar ASYNC NOAFFIRM VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=orclfar' scope=both;
--3.准备密码文件
[oracle@alldb:/home/oracle]$scp $ORACLE_HOME/dbs/orapworcl alldb3:$ORACLE_HOME/dbs/orapworclfar
--4.备库创建pfile、拷贝到级联备库并修改参数
scp $ORACLE_HOME/dbs/initorcladg.ora alldb3:$ORACLE_HOME/dbs/initorclfar.ora
*.audit_file_dest='/u01/app/oracle/admin/orclfar/adump'
*.audit_trail='DB','EXTENDED'
*.compatible='12.2.0'
*.control_files='/u01/app/oracle/oradata/orclfar/control01.ctl','/u01/app/oracle/oradata/orclfar/control02.ctl'
*.db_block_size=8192
*.db_file_name_convert='orcl','orclfar'
*.db_name='orcl'
*.db_unique_name='orclfar'
*.dg_broker_start=TRUE
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=orclfarXDB)'
*.enable_pluggable_database=true
*.fal_client='orclfar'
*.fal_server='orcladg'
*.local_listener='LISTENER_ORCLFAR'
*.log_archive_config='dg_config=(orcl,orcladg,orclfar)'
*.log_archive_dest_1='LOCATION=/arch VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=orclfar'
*.log_archive_dest_state_2='ENABLE'
*.log_archive_format='%t_%s_%r.arc'
*.log_archive_max_processes=4
*.log_archive_min_succeed_dest=1
*.log_file_name_convert='orcl','orclfar'
*.nls_language='AMERICAN'
*.nls_territory='AMERICA'
*.open_cursors=300
*.pga_aggregate_target=340m
*.processes=1000
*.remote_login_passwordfile='EXCLUSIVE'
*.sga_max_size=1468006400
*.sga_target=1468006400
*.standby_file_management='AUTO'
*.undo_tablespace='UNDOTBS1'
mkdir -p /u01/app/oracle/admin/orclfar/adump
mkdir -p /u01/app/oracle/oradata/orclfar
mkdir /arch
chown oracle:oinstall /arch
--5.添加TNS配置
ORCLFAR =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = alldb3)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orclfar)
    )
  )
 
--6.配置监听
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = alldb3)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )
SID_LIST_LISTENER =
  (SID_LIST =
      (SID_DESC =
         (GLOBAL_DBNAME = orclfar)
         (SID_NAME = orclfar)
         (ORACLE_HOME = /u01/app/oracle/product/12.2.0/db_1)
       )
  )
lsnrctl start

三、搭建备库

[oracle@alldb3:/home/oracle]$rman target sys/oracle@orcl auxiliary sys/oracle@orclfar
RMAN> duplicate target database for standby from active database nofilenamecheck;
SQL> alter database open;
SQL> recover managed standby database disconnect from session;

四、配置DG Broker

--1.级联备库配置静态监听(删除搭建时的静态监听)
SID_LIST_LISTENER =
  (SID_LIST =
      (SID_DESC =
         (GLOBAL_DBNAME = orclfar_DGMGRL)
         (SID_NAME = orclfar)
         (ORACLE_HOME = /u01/app/oracle/product/12.2.0/db_1)
       )
  )
 
--2.将级联备库加入的Broker Configuration
DGMGRL> add database orclfar AS CONNECT IDENTIFIER IS orclfar;
Database "orclfar" added
DGMGRL> show configuration;
Configuration - orclbroker
  Protection Mode: MaxPerformance
  Members:
  orcl    - Primary database
    orcladg - Physical standby database 
    orclfar - Physical standby database (disabled)
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS   (status updated 4 seconds ago)
--3.此时级联备库是disabled的状态，手工启用
DGMGRL> enable database orclfar;
Enabled.
DGMGRL> show configuration;
Configuration - orclbroker
  Protection Mode: MaxPerformance
  Members:
  orcl    - Primary database
    orcladg - Physical standby database 
    orclfar - Physical standby database 
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS   (status updated 2 seconds ago)
--4.此时级联备库已经enable了，但它变成了主库的第二备库，手工让它变成级联备库（执行后稍等一段时间）
--其实可以先修改broker configuration的RedoRoutes属性再enable database（还未尝试）
DGMGRL> EDIT DATABASE 'orcl' SET PROPERTY 'RedoRoutes' = '(LOCAL:orcladg SYNC)';
Property "RedoRoutes" updated
DGMGRL> EDIT DATABASE 'orcladg' SET PROPERTY 'RedoRoutes' = '(orcl:orclfar ASYNC)';
Property "RedoRoutes" updated
DGMGRL>  show configuration;
Configuration - orclbroker
  Protection Mode: MaxPerformance
  Members:
  orcl    - Primary database
    orcladg - Physical standby database 
      orclfar - Physical standby database (receiving current redo)
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS   (status updated 8 seconds ago)