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One to Many [message #636618]

Wed, 29 April 2015 04:26

vaibhav15211
Messages: 38
Registered: August 2012
Location: Hyderabad

Member

Hello,

Our client has different database for different countries. Say if there are three countries than three databases, which interface the GL data with Oracle system.

There is a view that picks the data from client servers using DB Links. Till now there was only one country and one server, now there are two more countries added.

The client wants to have only one DB Link that can connect oracle to all three databases. Is it even possible?

If not what other approach can we take to pick the data from client side.

Thanks,
Vaibhav

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Re: One to Many [message #636619 is a reply to message #636618]

Wed, 29 April 2015 04:50

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

As far as I can tell, one database links establishes connection to one database. Documentation says:Oracle

A database link is a connection between two physical database servers that allows a client to access them as one logical database.

That would mean that you can't do what client wants (besides, why does the client even care about it? He wants to see the data, he shouldn't care about the way you do it - one database link or three of them).

Another approach? As many database links as needed. The view you mentioned would then be a UNION, such as

create view my_view as
  select col1, col2, ...
  from table@database_link_1
  union all
  select col1, col2, ...
  from table@database_link_2
  union all
  select col1, col2, ...
  from table@database_link_3

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Re: One to Many [message #636620 is a reply to message #636619]

Wed, 29 April 2015 05:05

vaibhav15211
Messages: 38
Registered: August 2012
Location: Hyderabad

Member

Thanks littlefoot for your reply.
The union query is what we have provided the client but he is not comfortable in providing various DBLinks for different implementation to come in future. Hence wants only one DBLink.
We have already told that it is not technically possible but client is client and is stuck at one point. Sad

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Re: One to Many [message #636621 is a reply to message #636618]

Wed, 29 April 2015 05:20

gazzag
Messages: 1119
Registered: November 2010
Location: Bedwas, UK

Senior Member

Quote:

The client wants to have only one DB Link that can connect oracle to all three databases. Is it even possible?

No.
Quote:

If not what other approach can we take to pick the data from client side.

One link per database.

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