???????? ??? ?? ??????? ?????????????? Electricity?though?????ability?????} ????|?????? ?? ?? a ?? ??????? ?????????????|???????? ?? ?? {??|??|??| ????????? ?? ??? ?? ?? ?? ??? ??? ?? ?? ??????? ?? ????????SQL ???????????|????Google Analytics?_gid cookie ?? ?????????????? while?building??the web site?performance? ?? ?? ??? ?? ? {??|??|??|??????????