Application Server Releases and versions

Application Server Releases and versions

Application server versions may confuse bit but you can clarify by referring this

Oracle 9iAS:

Oracle 9iAS R1: 1.0.2.0 - 1.0.2.2.2
Oracle 9iAS R2: 9.0.2.0.0 - 9.0.3.0.0

Oracle 10g AS:

Oracle 10gAS R1: 9.0.4.0.0 - 9.0.4.3
Oracle 10gAS R2: 10.1.2 - 10.1.2.2.0
Oracle 10gAS R3: 10.1.3.0 - 10.1.3.3

In R12, 10.1.2 AS and 10.1.3 AS Homes are newly introduced in lieu of 8.0.6 and iAS(1.0.2.2) - 11i Architecture.

You may ask why do we have 10.1.2. AS and 10.1.3 AS?

Well, here is the answer.

10.1.2 AS installation will be supporting forms based applications.
It is Stanalone 10.1.2 forms/reports server installation. Other components are not included.

10.1.3 AS techstack will be used by java based applications.
10.1.3 AS instance brings latest OC4J code which is successor of 10.1.2 AS.
10.1.3 AS release doesn't contain forms/reports products. Hence to take advantage of latest oc4j code 10.1.3 AS got introduced. But to support ebiz forms applications 10.1.2 AS introduced.
You may remember that recently 10.1.3.3 got certified with R12 Suite.