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For ArcSDE clients on 64-bit operating systems, should a 32-bit or 64-bit Oracle Net Client be installed when connecting to an Oracle 64-bit database?
Install Oracle 32-bit client whether using Direct Connect or the Application server connection on a 64-bit operating system to access an Oracle 64-bit database with ArcSDE. (See Oracle Metalink for download, install, and setup instructions).
Esri recommends that the DBMS client and DBMS Server versions be the same, e.g. 10.2.0.3 on both client and server. See each system requirements DBMS notes section for database patch support and minimum recommended database client and server versions.
The system requirements can be found by going to the ArcSDE System Requirements.