Also note that these user logon/logoff triggers are best used for applications that utilize time-stamped users, which means those users who are given a unique Oracle user ID when they access the application.

If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right. HIPAA, the Sarbanes-Oxley Act, and the Gramm-Leach-Bliley Act have all produced serious constraints on Oracle professionals who are now required to produce detailed audit information for Oracle system users. federal laws have mandated increased security for auditing Oracle user activity.While a trigger is , which determines whether the trigger fires before or after the triggering statement runs and whether it fires for each row that the triggering statement affects. If the trigger is created on a schema or the database, then the triggering event is composed of either DDL or database operation statements, and the trigger is called a )".By default, a trigger is created in the enabled state. When a trigger fires, tables that the trigger references might be undergoing changes made by SQL statements in other users' transactions.A constraint can apply either to new data only (like a trigger) or to both new and existing data.Constraint behavior depends on constraint state, as explained in .Starting with Oracle8i, Oracle introduced special triggers that are not associated with specific DML events (e.g., INSERT, UPDATE, and DELETE).These system-level triggers included database startup triggers, DDL triggers, and end-user login/logoff triggers.Constraints are easier to write and less error-prone than triggers that enforce the same rules.However, triggers can enforce some complex business rules that constraints cannot.For multiple-table updates, there is no guarantee that assignments are carried out in any particular order.If you set a column to the value it currently has, My SQL notices this and does not update it.Your IP address (217.1) has been blocked for security reason.Probably your IP address has been used for violation of server security rules before.