Environment Variables

OFA Related

 * Oracle Base (whole software) and Oracle Home (only home)
 * /Dbs: default location for pfiles
 * /admin/instancename/pfile; non default but must location of pfiles.
 * /rdms;configuration scripts
 * /network;netowrk files

NON OFA Related

 * TNS_ADMIN;Non default location for network files i.e. tnsnames.ora
 * SID; Default instance
 * TWOTASK/LOCAL;Default net connection string
 * PATH; executable files location
 * LD_LIBRARY_PATH;Shared object libraries, also oraclehome/lib32