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首页 > 数据库 > oracle > Oracle ADG Far Sync日志备库

Oracle 26ai搭建ADG Far Sync日志备库的实例

作者：IT邦德

文章介绍了Oracle 12c的新功能：Active Data Guard Far Sync的配置与使用,详细描述了在主库和备库上创建Far Sync实例的过程,包括配置环境、创建控制文件、创建pfile文件、启动实例、配置监听和tnsnames.ora文件、启动实例到所需模式等步骤

1.DG Far Sync概述

Active Data Guard Far Sync是Oracle 12c引入的新功能（也称为Far Sync Standby）
可以在主备库之间添加一个Far Sync实例,redo数据先由主库传输到Far Sync实例，再由于Far Sync实例转发给备库。

2.配置环境

强制日志、开归档
mkdir -p /u01/recovery
mkdir -p /u01/arch

SQL> set linesize 300
SQL> select name,open_mode,log_mode,force_logging,DATABASE_ROLE,
switchover_status from v$database;
SQL> alter database force logging;

数据库开归档
如果想开快速恢复区的设置，做如下操作
alter system set db_recovery_file_dest_size=1800g;
alter system set db_recovery_file_dest=‘/u01/recovery’;

开归档的方式如下：
alter system set log_archive_dest_1=‘location=/u01/arch’;
SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE OPEN;

alter system switch logfile;

3.Far Sync实例

3.1 在主库上创建far sync实例的控制文件

ALTER DATABASE CREATE FAR SYNC
INSTANCE CONTROLFILE AS ‘/home/oracle/control01.ctl’;

3.2 创建Far Sync实例的pfile文件

create pfile=‘/home/oracle/pfile.init’ from spfile;

DB_UNIQUE_NAME=oradb
DB_FILE_NAME_CONVERT='/oradbst/','/oradb/'
LOG_FILE_NAME_CONVERT='/oradbst/','/oradb/'
FAL_SERVER=oradbst
LOG_ARCHIVE_CONFIG='DG_CONFIG=(oradb,oradbfs,oradbst)'
LOG_ARCHIVE_DEST_1='LOCATION=/u01/arch VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=oradb'
LOG_ARCHIVE_DEST_2='SERVICE=oradbfs SYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=oradbfs'
LOG_ARCHIVE_DEST_STATE_2=ENABLE
LOG_ARCHIVE_DEST_3='SERVICE=oradbst ASYNC NOAFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=oradbst'
LOG_ARCHIVE_DEST_STATE_3=ALTERNATE
standby_file_management=AUTO

3.3 在主库上以pfile启动并配置standbylogfile

startup pfile=‘/home/oracle/pfile.init’;
alter system set standby_file_management=manual;
添加standbylogfile

alter database add standby logfile group 4 (‘/u01/app/oracle/oradata/ORADB/standby_redo04.log’) size 200M;
alter database add standby logfile group 5 (‘/u01/app/oracle/oradata/ORADB/standby_redo05.log’) size 200M;
alter database add standby logfile group 6 (‘/u01/app/oracle/oradata/ORADB/standby_redo06.log’) size 200M;
alter database add standby logfile group 7 (‘/u01/app/oracle/oradata/ORADB/standby_redo07.log’) size 200M;
alter system set standby_file_management=AUTO;

3.4 生成spfile文件：

create spfile from pfile='/home/oracle/pfile.init';
将上面的控制文件和参数文件和密码文件复制到Far Sync实例所在的服务器。
将控制文件存放在/u01/app/oracle/oradata/oradbfs/control01.ctl
scp $ORACLE_HOME/dbs/orapworadb 
192.168.2.12:/u01/app/oracle/product/23.26.1/dbhome_1/dbs/
scp $ORACLE_HOME/dbs/orapworadb 
192.168.2.11:/u01/app/oracle/product/23.26.1/db_1/dbs/dbs

3.5 在far sync实例上配置pfile文件

DB_UNIQUE_NAME=oradbfs
DB_FILE_NAME_CONVERT='/ORADB/','/oradbfs/','/oradbst/','/oradbfs/'
LOG_FILE_NAME_CONVERT='/ORADB/','/oradbfs/','/oradbst/','/oradbfs/'
FAL_SERVER=oradb
LOG_ARCHIVE_CONFIG='DG_CONFIG=(oradb,oradbfs,oradbst)'
LOG_ARCHIVE_DEST_1='LOCATION=/u01/arch 
VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=oradbfs'
LOG_ARCHIVE_DEST_2='SERVICE=oradbst 
ASYNC VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=oradbst'
LOG_ARCHIVE_DEST_STATE_2=ENABLE
standby_file_management=AUTO
service_names=oradb

3.6 创建监听和tnsnames.ora

将备库和far sync实例创建好监听后一起写入主库的tnsnames.ora中并拷贝至每个节点

–tns配置如下：

oradb =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.14)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = oradb)
    )
  )
oradbfs =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.12)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = oradb)
    )
  )
oradbst =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.11)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = oradb)
    )
  )

–监听配置如下

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = oradb)
      (ORACLE_HOME = /u01/app/oracle/product/23.26.1/dbhome_1)
      (SID_NAME= oradb)
    )
   )
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = oradb)
      (ORACLE_HOME = /u01/app/oracle/product/23.26.1/db_1)
      (SID_NAME= oradb)
    )
   )

3.7 启动far sync到mount模式

export ORACLE_SID=oradb
startup nomount pfile=‘/home/oracle/pfile.init’;

rman target sys/oracle@oradb auxiliary sys/oracle@oradbfs

duplicate target database for farsync from active database;

4.备库搭建

在standby数据库上创建pfile文件

control_files='/u01/app/oracle/oradata/oradbst/control01.ctl'
DB_UNIQUE_NAME=oradbst
DB_FILE_NAME_CONVERT='/ORADB/','/oradbst/'
LOG_FILE_NAME_CONVERT='/ORADB/','/oradbst/'
FAL_SERVER='oradbfs','orad'
LOG_ARCHIVE_CONFIG='DG_CONFIG=(oradb,oradbfs,oradbst)'
LOG_ARCHIVE_DEST_1='LOCATION=/u01/arch VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=oradbst'
LOG_ARCHIVE_DEST_2='SERVICE=oradbfs ASYNC VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=oradb'
LOG_ARCHIVE_DEST_STATE_2=ENABLE
standby_file_management=AUTO
service_names=oradb

恢复备库数据库
export ORACLE_SID=oradb
startup nomount pfile=‘/home/oracle/pfile.init’;

rman target sys/oracle@oradb auxiliary sys/oracle@oradbst

duplicate target database for standby from active database dorecover nofilenamecheck;

在备库启动Managed Recovery Process
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

在主库上查询日志应用情况
set lines 300
col dest_name for a20
select dest_name,status,error from v$archive_dest;

将备库启动到ADG模式：
SQL> alter database recover managed standby database cancel;
SQL> alter database open;
SQL> alter pluggable database all open;
SQL> alter database recover managed standby database USING CURRENT LOGFILE disconnect from session;
SQL> select open_mode from v$database;

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