There are normally 3 levels of security - a)Controlling access to the instance b)Controling access to the database c)Controlling acess to the data itself There is one authentiaction type set for any instance. Authentication Types available ================================== SERVER - ID & password compare at server side SERVER_ENCRYPT - ID & password compare at server side CLIENT - ID & password compare at client side KERBEROS - ID & password compare at server side with Kerberos security facility KRB_SERVER_ENCRYPT - Authentication on server side DATA_ENCRYPT - Authentication occurs on the server side DATA_ENCRYPT_CMP - Authentication occurs at the server side GSSPLUGIN... Read more →