Oracle Transparent Gaeway Query

Hello Experts,
I am looking for a help here for the Oracle Transparent Gateway :
My objective is :
I have an EBPP application running on Jboss with SQL Server 2005.
Here are the details:
JDK 1.4
JBoss 3.2.5
SQL Server 2005
I would like to migrate it to Oracle 11g R2. I dont want to touch my application to make it compatible with Oracle. I would like to keep the SQL server drive and queries as it is. As far as i see, I have only one option.
One Go fo Oracle Transparent Gateway Way -
Migrate whole database of SQLserver 2005 to Oracle.
Shutdown the SQL server and install Oracle transparent gateway
Point the application to oracle transparent gateway.
Application will talk to oracle database via oracle transparent.
Upgrade application for oracle
Going with this, i have to upgrade so many things like JDK, JBoss and whole application.
Please advise, if you see a better approach to tacke this issue.
Thanks
Regards,
Zeeshan Qureshi

user1703057 wrote:
I have an EBPP application running on Jboss with SQL Server 2005.
Here are the details:
JDK 1.4
JBoss 3.2.5
SQL Server 2005
I would like to migrate it to Oracle 11g R2. I dont want to touch my application to make it compatible with Oracle. I would like to keep the SQL server drive and queries as it is. As far as i see, I have only one option.
One Go fo Oracle Transparent Gateway Way -
Incorrect. The Oracle Transparent Gateway is for the Oracle server to connect to the foreign server via a database link. This enables Oracle SQL and PL/SQL code to access a foreign database from the current Oracle database, by using a heterogeneous database link.
Sybrand raised a critical issue. Oracle != SQL-Server.
There are some fundamental and core differences between the two products. This means that a SQL-Server application will not be able to use Oracle optimally and scale accordingly - and that the application needs to be refactored.
What about this so-called +"the database is a black box+" approach that allows the database layer to supposedly be swap in and out for different database products - without having to touch the application?
A bunch of bull. For the black box approach to be used means developing the application to the very lowest common denominator that are supported by all RDBMS products. The lowest common denominator changes the RDBMS into a simplistic record-and-file architecture - using less than 5% of the actual capability of the RDBMS product. A total waste of technology and costs. One just as well could look at not using a RDBMS at all and simply roll the basic functionality in the app layer itself.
Your basic problem in my view is a conceptual one.
Applications are a dime a dozen. New code gets bashed out all the time. Applications are swapped in and out. Are upgraded. Are changed. There is a saying that if an application does not change, it is dead as it is no longer servicing business needs and growth and changes in the business and the market.
What remains fairly consistent and stable and constitutes the core, is the data. Simple example. What is important? The spreadsheet software or the spreadsheet data? Whether the spreadsheet s/w is Excel or Open Office or whatever - that is not what is important for the sales guy doing his sales projections. The actual spreadsheet and data are critical.
So it is about the data. Not about the application.
So your task is to make sure that the data layer is robust and consistent. Is performant and scalable. Is reliable. Is secure. And then put the application on top of that data layer.
It is not designing the application totally separate from the data layer and expect to simply swap one data layer for another and that the application will still fit and use that data layer correctly and optimally. (unless your an ISV doing a truly independent RDBMS s/w product, in which case you need to design and write a very large and very complex data access layer that can deal correctly with the specific data layer in use - and no, smelly stuff like Hibernate is not it)

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