Does the JDBC driver need to changin when moving Oracle 9i to Oracle 11g??

Hi All,
I have two cases
Case 1:
Application is deployed on WebLogic 10 (JDK 5) and connects to Oracle 9i database using the thin driver. Now the database is now moving from ORacle 9i to Oracle 11g. I have the following question:
1. Does the driver jar file and/or driver class need to be changed on the connection pool front?
2. If yes then, do we need to change any of the jdbc coding to ensure compatibility?
Case 2:
Application is deployed on WebLogic 8.1 (JDK 1.4) and connects to Oracle 10g database using the thin driver. Now the database is now moving from ORacle 10g to Oracle 11g and application is moving to WebLogic 10. I have the following question:
1. Does the driver jar file and/or driver class need to be changed on the connection pool front?
2. If yes then, do we need to change any of the jdbc coding to ensure compatibility?
Additioanlly, are there any other factors that I need to consider when upgrading these applications. Does any one have checklists?
Any help will be really helpful.
Thank you
Nikhil

nikhil.gonsalves wrote:
Case 1:
Application is deployed on WebLogic 10 (JDK 5) and connects to Oracle 9i database using the thin driver. Now the database is now moving from ORacle 9i to Oracle 11g. I have the following question:
1. Does the driver jar file and/or driver class need to be changed on the connection pool front?Advised to do so (bugfixes, possible performance optimisations), not required unless you want to use functionality the 9i driver doesn't support.
2. If yes then, do we need to change any of the jdbc coding to ensure compatibility?
Not unless you want to use things not supported by the old driver.
It is however a very good idea to at least update the name of the driver class, as the name used for the 9i driver has been deprecated (it's still allowed, but now leads to another method call which is a waste of CPU time).
Case 2:
Application is deployed on WebLogic 8.1 (JDK 1.4) and connects to Oracle 10g database using the thin driver. Now the database is now moving from ORacle 10g to Oracle 11g and application is moving to WebLogic 10. I have the following question:
1. Does the driver jar file and/or driver class need to be changed on the connection pool front?See above.
2. If yes then, do we need to change any of the jdbc coding to ensure compatibility?
See above (except for the driver class name which you should have used the new name already had the application been written to make use of the new name which was introduced in 10g).
Additioanlly, are there any other factors that I need to consider when upgrading these applications. Does any one have checklists?
You should always do a full regression test of your entire platform when attempting a migration like this.
Worst example of what can go wrong I ever encountered was an application where an upgrade of the database server it ran on led to a bugged batch job that for 5 years had (unnoticed to anyone) never completed because it always entered a timeout causing a rollback now suddenly no longer timing out and inserting 10k records of corrupt data every time it was run (where what it should insert were maybe a few dozen records of actual data at most).
The database engine upgrade had not been announced to the dev team, the team responsible for it didn't do regression tests (as application testing is the responsibility of the dev team), the sys admins who should make full backups at upgrade moments (so we could roll back to the previous release if something went wrong) made no backup because it was no application upgrade, and now one of the core applications for several dozen offices was fundamentally broken.
Technical lead for the application was literally on the other side of the world on a vacation, functional lead had left the company, the entire dev team consisted of me as a contractor brought in just 2 weeks prior and a new functional lead who'd arrived at about the same time, we were both still trying to get to know the system.
Potential financial loss: millions a week if it wasn't fixed quick.
That's the nightmare scenario from hell of course, where everything that could go wrong did go wrong all at the same time.

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[email protected] wrote:
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