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
| $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$# This is a sample agent init file that contains the HS parameters that are# needed for the Transparent Gateway for Sybase## HS init parameters#HS_FDS_CONNECT_INFO=migration_serv.taxHS_FDS_TRACE_LEVEL=OFFHS_FDS_RECOVERY_ACCOUNT=RECOVERHS_FDS_RECOVERY_PWD=RECOVER## Environment variables required for Sybase#set SYBASE=d:\sybase$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ |
上例中
server_name是migration_serv
database_name是tax
5.配置oracle网络服务的listener，配置文件是：listener.ora
默认路径：ORACLE_HOME\network\admin
加入如下：
SID_LIST_LISTENER=(SID_LIST=(SID_DESC=(SID_NAME= gateway_sid)(ORACLE_HOME= oracle_home_directory)(PROGRAM=tg4sybs)))
gateway_sid就是3选择的sid字符串
oracle_home_directory是ORACLE_HOME
tg4sybs若是SYBASE是特定的。如果是其他数据库，会不同。
例子如下：
| $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$(SID_DESC=(SID_NAME=tg4sybs)(ORACLE_HOME = D:\oracle\ora92)(PROGRAM=tg4sybs))$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ |
6.停止监听
lsnrctl stop
重新启动监听程序
lsnrctl start
7.配置oracle server的tnsnames.ora使其能够访问sybase
connect_descriptor=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST= host_name)(PORT= port_number))(CONNECT_DATA=(SID= gateway_sid))(HS=OK))
connect_descriptor是连接串，任取，一般为sybs
host_name：oracle server的name
port_number：oracle监听端口
gateway_sid就是3选择的sid字符串
例子如下：
| $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$sybs=(DESCRIPTION=(ADDRESS_LIST =(ADDRESS=(PROTOCOL=TCP)(HOST= dw-server1)(PORT= 1521)))(CONNECT_DATA=(SID= tg4sybs))(HS=OK))$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ |
8.建立database link
如：
CREATE DATABASE LINK sybs CONNECT TO sa IDENTIFIED BY prient USING 'SBYS' ；
即可访问sybase 数据库。
需要注意的是，sybase数据库的表名，字段名，如果是小写的，那么在oracle里访问的时候要加上双引号""
如：
SQL〉select "a" from "b"@sybs;
