[转]在Oracle里设置访问多个SQL Server

如何在Oracle里设置访问多个SQL Server数据库？假设我们要在ORACLE里同时能访问SQL Server里默认的pubs和Northwind两个数据库。

1、在安装了ORACLE9i Standard Edition或者ORACLE9i Enterprise Edition的windows机器上(IP:192.168.0.2), 产品要选了透明网关(Oracle Transparent Gateway)里访问Microsoft SQL Server数据库

          
           $ORACLE9I_HOME\tg4msql\admin下新写initpubs.ora和initnorthwind.ora配置文件.
           
initpubs.ora内容如下:
           
HS_FDS_CONNECT_INFO="SERVER=SQLSERVER_HOSTNMAE;DATABASE=pubs"
           
HS_DB_NAME=pubs
           
HS_FDS_TRACE_LEVEL=OFF
           
HS_FDS_RECOVERY_ACCOUNT=RECOVER
           
HS_FDS_RECOVERY_PWD=RECOVER
           
initnorthwind.ora内容如下:
           
HS_FDS_CONNECT_INFO="SERVER=sqlserver_hostname;DATABASE=Northwind"
           
HS_DB_NAME=Northwind
           
HS_FDS_TRACE_LEVEL=OFF
           
HS_FDS_RECOVERY_ACCOUNT=RECOVER
           
HS_FDS_RECOVERY_PWD=RECOVER
           

           
$ORACLE9I_HOME\network\admin 下listener.ora内容如下:
           
LISTENER =
           
  (DESCRIPTION_LIST =
           
   (DESCRIPTION =
           
    (ADDRESS_LIST =
           
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
           
  )
           
  )
           
  )
           

           
SID_LIST_LISTENER =
           
  (SID_LIST =
           
  (SID_DESC =
           
  (GLOBAL_DBNAME = test9)
           
  (ORACLE_HOME = d:\oracle\ora92)
           
  (SID_NAME = test9)
           
 )
           
  (SID_DESC=
           
  (SID_NAME=pubs)
           
  (ORACLE_HOME=d:\Oracle\Ora92) 
           
  (PROGRAM=tg4msql)
           
  )
           
  (SID_DESC=
           
  (SID_NAME=northwind)
           
  (ORACLE_HOME=d:\Oracle\Ora92) 
           
 (PROGRAM=tg4msql)
           
    )
           
  )

重启动这台做gateway的windows机器上(IP:192.168.0.2)TNSListener服务.

(凡是按此步骤新增可访问的SQL Server数据库时，TNSListener服务都要重启动)

2、ORACLE8I，ORACLE9I的服务器端配置tnsnames.ora, 添加下面的内容:

          
           pubs =
           
  (DESCRIPTION =
           
  (ADDRESS_LIST =
           
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
           
    )
           
    (CONNECT_DATA =
           
    (SID = pubs)
           
    )
           
    (HS = pubs) 
           
   )
           

           
northwind =
           
  (DESCRIPTION =
           
  (ADDRESS_LIST =
           
 (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
           
    )
           
    (CONNECT_DATA =
           
    (SID = northwind)
           
    )
           
    (HS = northwind) 
           
   )   
           
 保存tnsnames.ora后,在命令行下
           
 tnsping pubs
           
 tnsping northwind

出现类似提示，即为成功

          
           Attempting to contact (DESCRIPTION = (ADDRESS_LIST = 
           
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)
           
(PORT = 1521))) (CONNECT_DATA = (SID = pubs)) (HS = pubs))
           
OK（20毫秒）
           
Attempting to contact (DESCRIPTION = (ADDRESS_LIST =
           
 (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)
           
(PORT = 1521))) (CONNECT_DATA = (SID = northwind)) (HS = northwind))
           
OK（20毫秒）

设置数据库参数global_names=false。

设置global_names=false不要求建立的数据库链接和目的数据库的全局名称一致。global_names=true则要求, 多少有些不方便。

oracle9i和oracle8i都可以在DBA用户下用SQL命令改变global_names参数

          
           alter system set global_names=false;

建立公有的数据库链接:

          
           create public database link pubs 
           
connect to testuser identified by testuser_pwd using 'pubs';
           
create public database link northwind 
           
connect to testuser identified by testuser_pwd using 'northwind';
           
(假设SQL Server下pubs和northwind已有足够权限的用户登陆testuser,
           
密码为testuser_pwd)

访问SQL Server下数据库里的数据:

          
           select * from stores@pubs;
           
...... 	......
           
select * from region@northwind;
           
......  ......

3、使用时的注意事项

ORACLE通过访问SQL Server的数据库链接时，用select * 的时候字段名是用双引号引起来的。

例如：

          
           create table stores as select * from stores@pubs;
           
select zip from stores；
           
ERROR 位于第 1 行:
           
ORA-00904: 无效列名
           
select "zip" from stores;
           
zip
           
-----
           
98056
           
92789
           
96745
           
98014
           
90019
           
89076

已选择6行。

用SQL Navigator或Toad看从SQL Server转移到ORACLE里的表的建表语句为:

          
           CREATE TABLE stores
           
    ("stor_id"                      CHAR(4) NOT NULL,
           
    "stor_name"                    VARCHAR2(40),
           
    "stor_address"                 VARCHAR2(40),
           
    "city"                         VARCHAR2(20),
           
    "state"                        CHAR(2),
           
    "zip"                          CHAR(5))
           
  PCTFREE     10
           
  PCTUSED     40
           
  INITRANS    1
           
  MAXTRANS    255
           
  TABLESPACE  users
           
  STORAGE   (
           
    INITIAL     131072
           
    NEXT        131072
           
    PCTINCREASE 0
           
    MINEXTENTS  1
           
    MAXEXTENTS  2147483645
           
  )
           
/

总结:

WINDOWS下ORACLE9i网关服务器在$ORACLE9I_HOME\tg4msql\admin目录下的initsqlserver_databaseid.ora

WINDOWS下ORACLE9i网关服务器listener.ora里面

          
           (SID_DESC=
           
     		(SID_NAME=sqlserver_databaseid)
           
      		(ORACLE_HOME=d:\Oracle\Ora92) 
           
      		(PROGRAM=tg4msql)
           
   	)
           
   	UNIX或WINDOWS下ORACLE8I,ORACLE9I服务器tnsnames.ora里面
           
	northwind =
           
	  (DESCRIPTION =
           
(ADDRESS_LIST =
           
	(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
           
	    )
           
	(CONNECT_DATA =
           
	(SID = sqlserver_databaseid)
           
    		)
           
	(HS = sqlserver_databaseid) 
           
   	   )

sqlserver_databaseid一致才行.

[转]在Oracle里设置访问多个SQL Server

你可能感兴趣的:([转]在Oracle里设置访问多个SQL Server)