Create user xok Identified By fucku; //创建用户
GRANT SELECT ANY DICTIONARY TO xok; //授予所有字典的查询权限
GRANT SELECT ANY SEQUENCE TO xok; //授予所有序列的查询权限
GRANT SELECT ANY TABLE TO xok; //授予所有表的查询权限
GRANT CREATE SESSION TO xok; //授予创建会话
GRANT SELECT ANY VIEW TO xok; //授予所有视图的查询权限