ORACLE实现异种数据库连接服务的技术叫做透明网关（Transparent Gateway）。目前ORACLE利用透明网关可以实现和SQL SERVER、SYBASE、DB2等多种主流数据库的互联。
现在通过oracle访问sybase数据库，把配置oracle9i TRANSPARENT GATEWAY FOR SYBASE的步骤写成文档，供需要的网友参考！
配置TRANSPARENT GATEWAY FOR SYBASE步骤
1.
oracle所在服务器上安装sybase client（或者在同一台server上安装oracle、sybase服务器）确保能够访问sybase数据库
2.
安装TRANSPARENT GATEWAY FOR SYBASE选件，要用自定义安装。正确选择sybase的安装目录
3.
选择一个sid字符串准备赋给sybase数据库。如：tg4sybs设置SYBASE的dll路径到环境变量PATH（这一步很重要）
4.
修改初始化文件，默认的是：ORACLE_HOME\tg4sybs\admin\inittg4sybs.ora
设置参数
HS_FDS_CONNECT_INFO
格式：HS_FDS_CONNECT_INFO= server_name. database_name[,INTERFACE= interface_file]
server_name. database_name是大小写敏感的。
INTERFACE可选
例子：如下
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# This is a sample agent init file that contains the HS parameters that are
# needed for the Transparent Gateway for Sybase
#
# HS init parameters
#
HS_FDS_CONNECT_INFO=migration_serv.tax
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
#
# Environment variables required for Sybase
#
set SYBASE=d: ybase
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上例中
server_name是migration_serv
database_name是tax