Juan, Hmm....but Mladen could circumvent that by typing "commit" as soon as he logged in. ;-) -Mark Mark J. Bobak Oracle DBA ProQuest Company Ann Arbor, MI Hi I search some solution and found this , Maybe this trigger could help in some cases,=20 why don't you test. :) =20 CREATE TRIGGER FON.SADFASDF AFTER=20 LOGON ON DATABASE .. WHEN USER=3D'MLADEN' THEN SET TRANSACTION READ ONLY; .. / -- //www.freelists.org/webpage/oracle-l