I have a feeling of "déjà vu"

As you plan to use OBIEE 12c as front-end, your OBIEE 11g is required but will not be much used, therefore not a problem to have it on the same server as DAC & Informatica as OBIEE 11g there will be like "transparent", not adding any relevant load on the system.

I already wrote them above

Let's reformulate in a different way:

server1 = OBIEE 11g + DAC + Informatica ?

OBIA comes with OBIEE 11g which is outdated and the reason why most customers run OBIEE12c on the side in order to have a modern system.

"OBIEE" per se doesn't come with any prebuilt dashboards and analyses - not "reports"; "reports" is BI Publisher, a different technology. OBIA comes with prebuilt content which you would then migrate over to OBIEE 12c. Because OBIEE does not care one bit of what's uinderneath.

3808468 wrote:

 

OBIA is on 11 g server, how obiee 12c( server2) Prebuild RPD and Reports and Dashboards can communicate with OBIA 7964(server1)

It doesn't, because of what Christian said.

You need to forget OBIA 7964 as a product, because it isn't a product. OBIA 7964 is not a tool.

OBIA 7964 is "simply" a bundle package: it has a set of tools with pieces connected and pre-built content.

As Christian said, you need to do a classical OBIEE migration from OBIEE 11g (coming by default with OBIA) to your own OBIEE 12c. This is not an OBIA task, it's purely an OBIEE job.

OBIEE isn't connected to anything, all it needs is a RPD + a catalog. These are the 2 pieces you migrate (and security on top).

How does OBIEE 12c connect to " OBIA " ? A database connection, the one defined in the RPD telling OBIEE where is the database storing data.

I don't know if you job is just to do a plan and somebody else will do the install and config, but it's maybe worth to read documentation on what OBIEE is and how it works, look at some tutorials, check the migration documentation and then the same for OBIA so that you can clearly understand what tool does what and how and what are the dependencies.

The forum can give you high level ideas, but will never teach you the details.