Upgrading Oracle Server from 8.1.5 to 9i

Hi,
We are currently having a suite of front-end applications that
are using the oracle server 8.1.5. It is a distributed database.
We would like to upgrade it to 9i. I need some clarificatons on
this regard.
The details of the applications accessing this server are as
follows:
a)Application#1 in Forms6.0(Both NLS and English)
b)Application#2 in Visual Basic 6.0 using OO4O and OCI
c)Application#3 in Java 1.2 using Oracle JDBC 2.0 and JRE
1.2.2,PERLdb and ORAPerl
1.Is it enough only to upgrade the server and just test the
applications? Or should we do some changes to the applications
like recompiling,etc..,
2.What will be the effort involved in achieving this?
Please let us know.
Thanks in advance,
Devender

I will answer one by one :
* there is nothing called unstable ,, you need only to upgrade on TEST platform at first and after upgrade put the upgraded server under all kind of tests for some time ( saying 2 months / 24 H ) ,, when you sure that EVERYTHING is working as wanted and that there is no compatibility problems between server and its clients
* 9i are on its second release I am working on it for more than a year now on production environments on Windows / Linux and HPUX ,, all raised problems were been solved and workarounds were been showed up for other problems ( nothing new here - as usual for all previous releases ).
* 9i have got scripts for upgrading databases from previous versions ,, for AIX MAYBE it needs to upgrade first to 817 ,, you need to be sure ( you can get to Metalink )
* It depends on the application complexity ,, if talking about 2 database users for instance then its OK ,, if we are talking about Oracle Applications database which have 360 database user then it is next to imposible ,, For import / export accross versions you need to get back to Meatlink for more information ,, also have a test environment prior to getting to your production platform

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