最近在做ETL方面的项目，涉及到了从SQL Server数据库往Oracle数据库导数据的问题。网上很多都是使用 Oracle Transparent Gateways 的文章，但是由于它不是免费的，所以还是决定使用 Generic Connectivity 先看看。文档大部分是从OWB的CaseStudy文档转过来的

最近在做ETL方面的项目，涉及到了从SQL Server数据库往Oracle数据库导数据的问题。网上很多都是使用Oracle Transparent Gateways 的文章，但是由于它不是免费的，所以还是决定使用Generic Connectivity先看看。文档大部分是从OWB的CaseStudy文档转过来的，有兴趣的也可以去看看官方文档。由于公司都是使用英文，就马马虎虎看吧。

Step1. Create a System DSN

Set up a System Data Source Name (DSN) using the Microsoft ODBC Administrator.

1. Select Start, followed by Programs, OWB_ORACLE_HOME, Network

Administration, and then Microsoft ODBC Administrator.

2. Navigate to the System DSN tab and click Add to create a System DSN.

3. Select Microsoft SQL Server as the driver for which you want to set up the data source.

4. Specify the name of the DSN as sqlsource

5. Test the connection

Step2. Create the Heterogeneous Services Initialization File

Create the initsqlserver.ora file in the $ORACLE_HOME/hs/admin directory

as follows:

HS_FDS_CONNECT_INFO = sqlsource

HS_FDS_TRACE_LEVEL = 0

HS_AUTOREGISTER = TRUE

HS_DB_NAME = hsodbc

Step3. Modify the listener.ora file

To set up the listener, modify the entries in the listener.ora file located in the $ORACLE_HOME/network/admin directory as follows:

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = PLSExtProc)

(ORACLE_HOME = E:"oracle"product"10.2.0"db_1)

(PROGRAM = extproc)

)

(SID_DESC =

(SID_NAME = sqlserver)

(ORACLE_HOME = E:"oracle"product"10.2.0"db_1)

(PROGRAM = hsodbc)

)

)

LISTENER =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))

(ADDRESS = (PROTOCOL = TCP)(HOST = CNDAL426VWIN.intl.intlroot.fid-intl.com)(PORT = 1521))

)

)

1. For the SID_NAME parameter, use the SID that you specified in Step 2 when

creating the initialization parameter file for the Heterogeneous Services.

2. Ensure that the ORACLE_HOME parameter value is the path to your Oracle home

directory.

3. The value associated with the PROGRAM keyword defines the name of the agent

executable.

Remember to restart the listener after making these modifications.

Step4. Create a Database link

1. Login AsiaDB database as DBA

2. Running script: alter system set global_names = false;

3. Running script:

CREATE DATABASE LINK "ASIAUAT.REGRESS.RDBMS.DEV.US.ORACLE.COM"

CONNECT TO ASIADB

IDENTIFIED BY ASIADB

USING '(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)

(HOST=LOCALHOST)(PORT=1521)))

(CONNECT_DATA=(SID=SQLSERVER))

(HS=OK)

)';

4. Test

Select * from “action_logs”@ASIAUAT.REGRESS.RDBMS.DEV.US.ORACLE.COM

Notes: using “” and same case with SQL Server object name.