I am having ArcGIS Server 64 bit, which require Oracle Client 64bit to connect to oracle, and Also I have on same machine ArcGIS Desktop 32 bit which require Oracle client 32bit to connect to DB. can I install both oracle client 32 and 64 and dose the ArcGIS Server and Desktop will work?
Yes, in fact that is what is required if you install ArcGIS for Server and ArcGIS for Desktop on the same machine as you are doing. If both ArcGIS for Server and ArcGIS for Desktop are installed on the same MS Windows machine, specify the 64-bit client before the 32-bit client in the PATH environment variable. Otherwise, you will experience connectivity issues.