[Didn't get a response from either GIS Stackexchange or from Stackoverflow--maybe I should have posted here first. Sorry, if I seem like spamming but am stuck].
I have been tasked with migrating some ArcGIS Services from an ArcGIS Server 10.0 (say, server A) to another (more robust) machine running ArcGIS Server 10.2 (server B).
The Services on A are pointing to an Oracle Database Server 10.2 (64 bit, I think). So far, on Server B, I have only installed the ArcGIS Server 10.2 software--and no Oracle Client yet.
On server A, there IS an ArcSDE Service running; there may be both 32/64 bit Oracle clients installed on server A.
1) Should I install Oracle Instant Client 32 bit or 64 bit server B?
2) Should I install ArcSDE Application Server on server B? If so then where do find the installation file? Also, no Desktop connections will be needed to the Oracle db server and so any 'direct' connection would be okay?