在Oracle里设置造访多个SQL Server

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若安在Oracle里设置造访多个SQL Server数据库？假定我们要在ORACLE里同时能造访SQL Server里默许的pubs和Northwind两个数据库。

1、在装配了ORACLE9i Standard Edition大概ORACLE9i Enterprise Edition的windows呆板上(IP:192.168.0.2), 产品要选了透明网关(Oracle Transparent Gateway)里造访Microsoft SQL Server数据库

$ORACLE9I_HOMEtg4msqladmin下新写initpubs.ora和initnorthwind.ora装备文件.
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_HOMEnetworkadmin 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呆板上(IP:192.168.0.2)TNSListener效劳.

(平日按此步骤新增可造访的SQL Server数据库时，TNSListener效劳都要重启动)

2、ORACLE8I，ORACLE9I的效劳器端装备tnsnames.ora, 添加上面的内容:

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) 
   )   
 保管tnsnames.ora后,在敕令行下
 tnsping pubs
 tnsping northwind

泛起相似提示，即为告成

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不要求挺立的数据库链接和方针数据库的全局称呼不合。global_names=true则要求, 几多有些倒运便。

oracle9i和oracle8i都可以在DBA用户下用SQL敕令窜改global_names参数

alter system set global_names=false;

挺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';
(假定SQL Server下pubs和northwind已有充足权限的用户上岸testuser,
密码为testuser_pwd)

造访SQL Server下数据库里的数据:

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

3、运用时的留意事件

ORACLE经由议定造访SQL Server的数据库链接时，用select * 的时辰字段名是用双引号惹起来的。

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网关效劳器在$ORACLE9I_HOMEtg4msqladmin目次下的initsqlserver_databaseid.ora

WINDOWS下ORACLE9i网关效劳器listener.ora内中

(SID_DESC=
     		(SID_NAME=sqlserver_databaseid)
      		(ORACLE_HOME=d:OracleOra92) 
      		(PROGRAM=tg4msql)
   	)
   	UNIX或WINDOWS下ORACLE8I,ORACLE9I效劳器tnsnames.ora内中
	northwind =
	  (DEscriptION =
(ADDRESS_LIST =
	(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.2)(PORT = 1521))
	    )
	(CONNECT_DATA =
	(SID = sqlserver_databaseid)
    		)
	(HS = sqlserver_databaseid) 
   	   )

sqlserver_databaseid不合才行.




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