1.oracle所在服務器上安裝Sybase clIEnt(或者在同一台server上安裝Oracle、sybase服務器)，確保能夠訪問Sybase數據庫；
2.安裝TRANSPARENT GATEWAY FOR SYBASE選件，要用自定義安裝。正確選擇Sybase的安裝目錄；
3.選擇一個sid字符串准備賦給Sybase數據庫。如：tg4sybs設置Sybase的dll路徑到環境變量PATH(這一步很重要)；
4.修改初始化文件，默認的是：
Oracle_HOME\tg4sybs\admin\inittg4sybs.ora
設置參數
HS_FDS_CONNECT_INFO
格式：
HS_FDS_CONNECT_INFO= server_name. database_name[,INTERFACE= interface_file]
server_name. database_name是大小寫敏感的。
INTERFACE可選
例子：如下
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
# This is a sample agent init file that contains the HS parameters that are
# needed for the Transparent Gateway for Sybase
#
# HS init parameters
#
HS_FDS_CONNECT_INFO=migration_serv.tax
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
#
# Environment variables required for Sybase
#
set SYBASE=d:\Sybase
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
上例中
server_name是migration_serv
database_name是tax
5.配置Oracle網絡服務的listener,配置文件是：listener.ora
默認路徑：Oracle_HOME\network\admin
加入如下：
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME= gateway_sid)
(ORACLE_HOME= Oracle_home_directory)
(PROGRAM=tg4sybs)
)
)
gateway_sid就是3選擇的sid字符串
oracle_home_directory是Oracle_HOME
tg4sybs若是Sybase是特定的。如果是其他數據庫，會不同。
例子如下：
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
(SID_DESC=
(SID_NAME=tg4sybs)
(ORACLE_HOME = D:\Oracle\ora92)
(PROGRAM=tg4sybs)
)
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
6.停止監聽
lsnrctl stop
重新啟動監聽程序
lsnrctl start
7.配置Oracle server的tnsnames.ora使其能夠訪問Sybase
connect_descriptor=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST= host_name)
(PORT= port_number)
)
(CONNECT_DATA=
(SID= gateway_sid))
(HS=OK))
connect_descriptor是連接串，任取，一般為sybs
host_name：Oracle server的name
port_number：Oracle監聽端口
gateway_sid就是3選擇的sid字符串
例子如下：
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
sybs=
(DESCRIPTION=
(ADDRESS_LIST =
(ADDRESS=(PROTOCOL=TCP)(HOST= dw-server1)(PORT= 1521))
)
(CONNECT_DATA=
(SID= tg4sybs)
)
(HS=OK)
)
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
8.建立database link
如：
CREATE DATABASE LINK sybs CONNECT TO sa
IDENTIFIED BY prIEnt
USING 'SBYS' ；
即可訪問Sybase數據庫。
需要注意的是，Sybase數據庫的表名，字段名，如果是小寫的，那麼在Oracle裡訪問的時候要加上雙引號""
如：
SQL〉select "a" from "b"@sybs;
