login as system insert into SQLPLUS_PRODUCT_PROFILE values ('SQL*Plus', 'YONG', 'HOST', null, null, 'DISABLED', null, null); create user yong identified by yong; grant dba to yong; conn yong/yong SQL> host ls SP2-0544: invalid command: host On Windows: SQL> host date SP2-0544: invalid command: host login as system delete from SQLPLUS_PRODUCT_PROFILE where userid = 'YONG'; commit; conn yong/yong SQL> host date Tue Jan 28 12:50:11 CST 2003 References SQL*Plus User's Guide and Reference, E Security