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在ORACLE裡設置訪問多個SQL Server數據庫

2013-11-13 12:47:34  來源: Oracle 

  ORACLE訪問SQL SERVER數據庫有一篇《Oracle 異構服務實踐》講得很清楚
  
  但裡面沒有講如何設置訪問多個SQL Server數據庫 我就補充一下
  
  假設我們要在ORACLE裡同時能訪問SQL Server裡默認的pubs和Northwind兩個數據庫
  
  在安裝了ORACLEi Standard Edition或者ORACLEi Enterprise Edition的windows機器上(IP:)
  產品要選了透明網關(Oracle Transparent Gateway)裡要訪問Microsoft SQL Server數據庫
  
  $ORACLEI_HOME\tgmsql\admin下新寫initpubsora和initnorthwindora配置文件
  initpubsora內容如下:
  HS_FDS_CONNECT_INFO=SERVER=sqlserver_hostname;DATABASE=pubs
  HS_DB_NAME=pubs
  HS_FDS_TRACE_LEVEL=OFF
  HS_FDS_RECOVERY_ACCOUNT=RECOVER
  HS_FDS_RECOVERY_PWD=RECOVER
  
  initnorthwindora內容如下:
  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
  
  (藍色字的部分可以根據具體要訪問的SQL Server數據庫的情況而修改)
  
  $ORACLEI_HOME\network\admin 下listenerora內容如下:
  
  LISTENER =
  (DESCRIPTION_LIST =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = ))
  )
  )
  )
  SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
  (GLOBAL_DBNAME = test)
  (ORACLE_HOME = d:\oracle\ora)
  (SID_NAME = test)
  )
  (SID_DESC=
  (SID_NAME=pubs)
  (ORACLE_HOME=d:\Oracle\Ora)
  (PROGRAM=tgmsql)
  )
  (SID_DESC=
  (SID_NAME=northwind)
  (ORACLE_HOME=d:\Oracle\Ora)
  (PROGRAM=tgmsql)
  )
  )
  
  重啟動這台做gateway的windows機器上(IP:)TNSListener服務
  
  (凡是按此步驟新增可訪問的SQL Server數據庫時TNSListener服務都要重啟動)
  ORACLEIORACLEI的服務器端配置tnsnamesora 添加下面的內容:
  pubs =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = ))
  )
  (CONNECT_DATA =
  (SID = pubs)
  )
  (HS = pubs)
  )
  
  northwind =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = ))
  )
  (CONNECT_DATA =
  (SID = northwind)
  )
  (HS = northwind)
  )
  
  保存tnsnamesora後在命令行下
  
  tnsping pubs
  tnsping northwind
  
  出現類似提示即為成功
  Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = )
  (PORT = ))) (CONNECT_DATA = (SID = pubs)) (HS = pubs))
  OK(毫秒)
  
  Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = )
  (PORT = ))) (CONNECT_DATA = (SID = northwind)) (HS = northwind))
  OK(毫秒)
  
  設置數據庫參數global_names=false
  
  設置global_names=false不要求建立的數據庫鏈接和目的數據庫的全局名稱一致
  global_names=true則要求 多少有些不方便
  
  oraclei和oraclei都可以在DBA用戶下用SQL命令改變global_names參數
  
  alter system set global_names=false;
  
  建立公有的數據庫鏈接:
  
  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;
  
  (假設SQL Server下pubs和northwind已有足夠權限的用戶登錄testuser密碼為testuser_pwd)
  
  訪問SQL Server下數據庫裡的數據:
  
  select * from stores@pubs;
   
  
  select * from region@northwind;
   
  
  使用時的注意事項
  ORACLE通過訪問SQL Server的數據庫鏈接時用select * 的時候字段名是用雙引號引起來的
  
  例如
  create table stores as select * from stores@pubs;
  
  select zip from stores
  
  ERROR 位於第 行:
  ORA: 無效列名
  
  select zip from stores;
  
  zip
  
  
  
  
  
  
  
  已選擇
  
  用SQL Navigator或Toad看從SQL Server轉移到ORACLE裡的表的建表語句為:
  
  CREATE TABLE stores
  (stor_id           CHAR() NOT NULL
  stor_name          VARCHAR()
  stor_address         VARCHAR()
  city             VARCHAR()
  state            CHAR()
  zip             CHAR())
  PCTFREE  
  PCTUSED  
  INITRANS  
  MAXTRANS  
  TABLESPACE users
  STORAGE  (
  INITIAL  
  NEXT    
  PCTINCREASE
  MINEXTENTS 
  MAXEXTENTS 
  )
  /
  總結: WINDOWS下ORACLEi網關服務器在$ORACLEI_HOME\tgmsql\admin目錄下的initsqlserver_databaseidora
  WINDOWS下ORACLEi網關服務器listenerora裡面
  (SID_DESC=
  (SID_NAME=sqlserver_databaseid)
  (ORACLE_HOME=d:\Oracle\Ora)
  (PROGRAM=tgmsql)
  )
  
  UNIX或WINDOWS下ORACLEIORACLEI服務器tnsnamesora裡面
  northwind =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = ))
  )
  (CONNECT_DATA =
  (SID = sqlserver_databaseid)
  )
  (HS = sqlserver_databaseid)
  )
  
  sqlserver_databaseid一致才行
  

From:http://tw.wingwit.com/Article/program/Oracle/201311/16587.html
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