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Database Link Issue [message #75583]

Wed, 01 December 2004 15:48

Gulab Basha
Messages: 7
Registered: June 2003

Junior Member

Hi there,

I am facing strange issue with Database Link. The issue is Database Link is successfully created but when I select the data from the tables it returns no rows.

To give you complete details. I have two databases in different servers.

First Database SALESDB in Server1 and MANDB in Server2. I have created tns entry in Server2 pointing to SALESDB that is in Server1.

I have created database Link by connecting SYSTEM/MANAGER@MANDB in Server2. The command was:

CREATE DATABASE LINK SALESDBLINK CONNECT TO SALES_OWNER IDENTIFIED BY SALES_OWNER USING 'SALESDB';

I tried to Select records in several ways:

1. SELECT COUNT(1) FROM SALES@SALESDBLINK;

It returns the Zero where as the records are present in the actual table.

2. CREATE SYNONYM SALESSYN FOR SALES@SALESDBLINK;

SELECT COUNT(1) FROM SALESSYN;

It returns the Zero where as the records are present in the actual table.

3. CREATE OR REPLACE VIEW SALESVIEW AS SELECT COUNT(1) COUNT_SALES FROM SALES@SALESDBLINK;

SELECT * FROM SALESVIEW;

It returns the Zero where as the records are present in the actual table.

I am wondering why the records are not retrieved by this DBLINK. Is there anything I am missing out in setup.

For your information I have also tried same steps with PUBLIC DATABASE LINK too.

Could you please give me suggestions or clues so that I can overcome this issue.

Many Thanks,

Gulab.

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Re: Database Link Issue [message #75584 is a reply to message #75583]

Wed, 08 December 2004 10:54

Frank Naude
Messages: 4581
Registered: April 1998

Senior Member

Hi,

Here are a couple of things to check:

1. Do you have data in this table? Check on the source system.

2. Does your DB link point to the right database - do a "select * from global_name;" to check.

3. Is the DB link connecting to the right user - do a "select username from dual@DBLINK;" to check.

Best regards.

Frank

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Re: Database Link Issue [message #75591 is a reply to message #75583]

Tue, 21 December 2004 00:14

Nvgpal
Messages: 3
Registered: December 2004

Junior Member

Try this way append the user name to that table

SELECT COUNT(1) FROM SALES_OWNER.SALES@SALESDBLINK;

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Re: Database Link Issue [message #112845 is a reply to message #75591]

Tue, 29 March 2005 11:41

tarun123v
Messages: 9
Registered: March 2005
Location: Hyderabad(India)

Junior Member

Did u use Materialized View if u have used Materialized View
this line should work
select * from sales sales@linkname;
you need not give the owner this will be taken care by Materialized View
if you have not used this view then you need to give the owner name

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