Oracle 8i双机热备是一种高可用性解决方案，它可以确保在一台服务器出现故障时，另一台服务器能够立即接管工作，从而保证数据的安全性和系统的连续性，本文将详细介绍如何实现Oracle 8i双机热备。

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准备工作

1、确保两台服务器的硬件配置相同，包括CPU、内存、硬盘等。

2、在两台服务器上安装Oracle 8i数据库软件，并设置相同的数据库参数。

3、在两台服务器上创建相同的表空间、用户、数据文件等。

4、在两台服务器上配置相同的网络环境，包括IP地址、子网掩码、网关等。

5、在两台服务器上安装Oracle GoldenGate软件，用于数据同步。

配置Oracle 8i双机热备

1、在主服务器上创建一个监听器，监听器的名称可以自定义，listener_master，编辑listener.ora文件，添加以下内容：

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 主服务器IP地址)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

2、在备服务器上创建一个监听器，监听器的名称可以自定义，listener_standby，编辑listener.ora文件，添加以下内容：

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 备服务器IP地址)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

3、在主服务器上创建一个服务名，服务名可以自定义，orcl_service，编辑tnsnames.ora文件，添加以下内容：

ORCL_SERVICE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 主服务器IP地址)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl_service)
    )
  )

4、在备服务器上创建一个服务名，服务名可以自定义，orcl_service，编辑tnsnames.ora文件，添加以下内容：

ORCL_SERVICE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 备服务器IP地址)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl_service)
    )
  )

配置数据同步

1、在主服务器上创建一个源连接，源连接的名称可以自定义，source_goldengate，编辑initsid.ora文件，添加以下内容：

SOURCE_GOLDENGATE = source_goldengate
USERID=dba
FAILOVER=ON ALLOWTIMEOUT=60 SECONDS RETRYCOUNT=300 CONNECTTIMEOUT=60 SECONDS TARGET=orcl_service MESSAGES='DISCARD ALL' AUXILIARY=OFF PROPAGATEERRORS=OFF ISSUERCOMPLETEOK=ON SUPPRESSSQLWARNINGS=OFF XIDVALIDATION=OFF ENCRYPTDATA=OFF ENCRYPTOPTIONS='XEXTERNAL' DDLCOLLECTION=FALSE DMLCOLLECTION=TRUE LOGDIRECT=OFF OPERATION=TABLE OPERAND=(all tables with read access) TRACEFILEGROUP='/u01/app/oracle/diag/rdbms/orcl/orcl/trace' MIRRORINGMODE=ENABLE PRIMARYROLE=PRIMARY SECONDARYROLE=SECONDARY FILTERVALIDATION=FALSE FILTERINVALIDATIONACTION=IGNORE INVALIDATIONACTION=IGNORE INCLUDENULLVALUESRELATIONSHIPS=FALSE INCLUDEBLANKVALUESRELATIONSHIPS=FALSE INCLUDEFIELDVALUESRELATIONSHIPS=FALSE INCLUDEGLOBVALUESRELATIONSHIPS=FALSE INCLUDESCHEMANAMESRELATIONSHIPS=FALSE INCLUDESCHEMAOWNERSRELATIONSHIPS=FALSE INCLUDEDDLLSCHEMASRELATIONSHIPS=FALSE INCLUDEDTABLESPACESRELATIONSHIPS=FALSE INCLUDEDTABLESPACEOWNERSRELATIONSHIPS=FALSE INCLUDEDEFAULTVALUESRELATIONSHIPS=FALSE INCLUDECOMMENTSRELATIONSHIPS=FALSE INCLUDEINDEXEDCOLUMNSTORELATIONSHIPS=FALSE INCLUDEINDEXEDCOLUMNSTOREOWNERSRELATIONSHIPS=FALSE INCLUDEINDEXEDCOLUMNSTORETABLESPACESRELATIONSHIPS=FALSE INCLUDEINDEXEDCOLUMNSTORETABLESPACEOWNERSRELATIONSHIPS=FALSE INCLUDEPARTITIONINFORREPLICATION=TRUE INCLUDEPARTITIONKEYINFORREPLICATION=TRUE INCLUDEPARTITIONSTATISTICSFORREPLICATION=TRUE INCLUDEPARTITIONSUBPARTITIONINFORREPLICATION=TRUE INCLUDEPARTITIONSUBPARTITIONKEYINFORREPLICATION=TRUE INCLUDEPARTITIONSUBPARTITIONSTATISTICSFORREPLICATION=TRUE INCLUDEALLROWSINVALIDATION=TRUE INCLUDEALLROWSONTHEPRIMARYINVALIDATION=TRUE INCLUDEALLROWSONTHESECONDARYINVALIDATION=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATION=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHUPDATES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHMERGEUPDATES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHMERGEDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHMERGEINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDMERGEUPDATES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDMERGEDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDMERGEINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDMERGEUPDATES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDMERGEDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDMERGEINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDAPPENDDELETES=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESANDAPPENDINSERTS=TRUE INCLUDEALLROWSONTHEPRIMARYANDSECONDARYINVALIDATIONWITHAPPENDUPDATESAND

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