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在Oracle里设置访问多个SQLServer

答案: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_HOMEg4msqladmin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=pubsHS_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

  etworkadmin 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:oracleora92)

  (SID_NAME = test9)

  )

  (SID_DESC=

  (SID_NAME=pubs)

  (ORACLE_HOME=d:OracleOra92)

  (PROGRAM=tg4msql)

  )

  (SID_DESC=

  (SID_NAME=northwind)

  (ORACLE_HOME=d:OracleOra92)

  (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

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