序言:
DataGuard是通过建立一个PRIMARY和STANDBY组来确立其参照关系;STANDBY一旦创建,DataGuard就会通过将主数据库(PRIMARY)的REDO传递给STANDBY数据库,然后在STANDBY中应用REDO实现数据库的同步。
有两种类型的STANDBY:物理STANDBY和逻辑STANDBY
物理STANDBY提供与主数据库完全一样的拷贝(块到块),数据库SCHEMA,包括索引都是一样的。它是直接应用REDO实现同步的。
逻辑STANDBY则不是这样,在逻辑STANDBY中,逻辑信息是相同的,但物理组织和数据结构可以不同,它和主库保持同步的方法是将接收的REDO转换成SQL语句,然后在STANDBY上执行SQL语句。逻辑STANDBY除灾难恢复外还有其它用途,比如用于用户进行查询和报表。
1、安装环境
在primary搭建数据库软件,建立lsnrctl监听,采用dbca搭建实例,在standby上搭建数据库软件,建立监听,但是不需要采用dbca建立实例。
如何在Linux上搭建Oracle数据库,请参考前面的文章:
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
Oracle Data Guard 重要配置参数
基于同一主机配置 Oracle 11g Data Guard
探索Oracle之11g DataGuard
Oracle Data Guard (RAC+DG) 归档删除策略及脚本
Oracle Data Guard 的角色转换
Oracle Data Guard的日志FAL gap问题
Oracle 11g Data Guard Error 16143 Heartbeat failed to connect to standby 处理方法
项目列表 primary库 standby库 操作系统: 都是centos6.4 都是centos6.4 oracle软件版本: oracle 11.2.0.1.0 oracle 11.2.0.1.0 IP地址: 192.168.121.217 192.168.121.218 db_unique_name: pdunq pdunq_dg2、准备工作 在primary上操作
2.1、打开Forced Logging 模式
先确认primary库处于归档模式
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 362
Next log sequence to archive 364
Current log sequence 364
SQL>
强制归档
SQL> alter database force logging;
Database altered.
SQL>
确认primary库是归档模式
添加standby文件
alter database add standby logfile group 4 ('/home/oradata/powerdes/redo_dg_021.log') size 20M;
alter database add standby logfile group 5 ('/home/oradata/powerdes/redo_dg_022.log') size 20M;
alter database add standby logfile group 6 ('/home/oradata/powerdes/redo_dg_023.log') size 20M;
alter database drop standby logfile group 4;
alter database drop standby logfile group 5;
alter database drop standby logfile group 6;
查看所有redo文件列表,select * from v$logfile order by 1;
SQL> select * from v$logfile order by 1;
1 ONLINE /home/oradata/powerdes/redo03.log NO
2 ONLINE /home/oradata/powerdes/redo02.log NO
3 ONLINE /home/oradata/powerdes/redo01.log NO
4 STANDBY /home/oradata/powerdes/redo_dg_021.log NO
5 STANDBY /home/oradata/powerdes/redo_dg_022.log NO
6 STANDBY /home/oradata/powerdes/redo_dg_023.log NO
6 rows selected.
SQL>
2.3 准备参数文件
2.3.1 生成pfile
create pfile from spfile;
shutdown immediate
2.3.2 修改pfile
cp $ORACLE_HOME/dbs/initpowerdes.ora $ORACLE_HOME/dbs/initpowerdes.ora.bak
vim $ORACLE_HOME/dbs/initpowerdes.ora
*.db_unique_name=pdunq
*.diagnostic_dest='/oracle/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=powerdesXDB)'
*.fal_client='pdunq'
*.fal_server='pdunq_dg'
*.standby_file_management='AUTO'
*.db_file_name_convert='/home/oradata/powerdes','/home/oradata/pwerdes'
*.log_file_name_convert='/home/oradata/powerdes','/home/oradata/powerdes'
*.log_archive_config='DG_CONFIG=(pdunq,pdunq_dg)'
*.log_archive_dest_2='SERVICE=pdunq_dg lgwr sync affirm VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=pdunq_dg'
*.log_archive_dest_state_2='ENABLE'
2.3.3 生成spfile
create spfile from pfile;
startup #这里可以启动也可以不启动,这里不启动,后面就要记得startup;让新的参数文件生效
2.4 修改监听文件
[oracle@powerlong4 admin]$ vim listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = powerdes)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.217)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)
ADR_BASE_LISTENER = /oracle/app/oracle
INBOUND_CONNECT_TIMEOUT_listener=10
2.5,修改tns配置文件
[oracle@powerlong4 admin]$ vim tnsnames.ora
PD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.217)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = pdunq)
)
)
SC_SID =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.218)(PORT = 1521))
)
(CONNECT_DATA =
(SID = powerdes)
(SERVER = DEDICATED)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
2.6 监听服务重启
lsnrctl stop
lsnrctl start
2.7 primary上配置最大可用模式:
SQL>startup
SQL>alter database set standby database to maximize availability;
2.8 备份数据库
backup database plus archivelog;
backup current controlfile for standby;
exit;
备份结束后会在闪回区产生备份文件
3,数据库配置 standby上
3.1 建立相应的文件目录
包括dump文件目录,数据文件目录,通过show parameter dest;查看,保持和primary一样的路径地址
3.2 从primary上copy数据文件到standby上
在主库上执行:
ps:在primary上执行
copy闪回区内容
copy闪回文件
cd /oracle/app/oracle/flash_recovery_area/
scp -r ./* 192.168.121.218:/oracle/app/oracle/flash_recovery_area/
copy参数文件
cd /oracle/app/oracle/product/11.2.0/dbhome_1/dbs
scp -r ./* 192.168.121.218:/oracle/app/oracle/product/11.2.0/dbhome_1/dbs
copy监听文件
cd /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/
scp -r ./* 192.168.121.218:/oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/
3.3 在standby库 修改配置文件 在standby上修改
[oracle@powerlong5 admin]$ vim listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = powerdes)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/dbhome_1)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.121.218)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)
在standby修改tns文件
3.4,修改参数文件
*.db_unique_name='pdunq_dg'
*.diagnostic_dest='/oracle/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=powerdes)'
*.fal_client='pdunq'
*.fal_server='pdunq_dg'
*.standby_file_management='AUTO'
*.db_file_name_convert='/home/oradata/powerdes','/home/oradata/powerdes'
*.log_file_name_convert='/home/oradata/powerdes','/home/oradata/powerdes'
*.log_archive_config='DG_CONFIG=(pdunq,pdunq_dg)'
*.log_archive_dest_2='SERVICE=pdunq_dg lgwr sync affirm VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=pdunq_dg'
*.log_archive_dest_state_2='ENABLE'
PS:将*.log_archive_dest_2=后面的DB_UNIQUE_NAME改成primary的DB_UNIQUE_NAME值改为pdunq,这样在做switchover的时候,新的primary能通过这个将redo日志传到新的standby上面去。
log_archive_dest_N 目的是告诉数据库,把归档放到那里去可选项,首先是本地,然后考虑远程的从库,所以,假设A是主库,B是从库,切换之后B是主库,A是从库,所以,log_archive_dest_N需要设置为对方
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