If you use Oracle to store your Enterprise Geodatabase, you should hold off with installing Oracle’s Critical Patch Update released on October 14th, 2014.  The patch update will prevent ArcGIS Desktop from connecting to it and your connections will hang or crash.  ESRI recommends NOT TO INSTALL THE UPDATE.  More on this issue here:

http://support.esri.com/en/knowledgebase/techarticles/detail/43293