How to run DDL in a Trigger?

Question

I am trying to create a trigger that automatically sets the quota for any new users created in the database. However, I am running into the follow error because whenever you run DDL, Oracle automatically commits, which you can't do in a trigger. Does anyone have any ideas on how to get around this? We are on Oracle 11gR1.
. The problem is, I am getting an ERROR at line 1:
ORA-04092: cannot COMMIT in a trigger
CREATE OR REPLACE TRIGGER TESTER.AUTO_QUOTA
AFTER INSERT ON USERS FOR EACH ROW
DECLARE
sqlstmt     VARCHAR2(100);
BEGIN
sqlstmt:='ALTER USER ' || :NEW.USERNAME || ' QUOTA UNLIMITED ON ' || :NEW.TABLESPACE_NAME;
execute IMMEDIATE SQLSTMT;
END;
/

Answer 1

ji**** wrote:
I am trying to create a trigger that automatically sets the quota for any new users created in the database. However, I am running into the follow error because whenever you run DDL, Oracle automatically commits, which you can't do in a trigger. Does anyone have any ideas on how to get around this? We are on Oracle 11gR1.This approach is wrong.
What is the purpose of a trigger? The answer is protecting the integrity of the transaction - not to do "extra stuff" outside the current actual business transaction. Like sending e-mails. Or SMS's. Or issue DDL commands.
What happens when you do "extra stuff" in that trigger and the transaction is rolled back for example? What now happens to that "extra stuff" that should not have existed/have been done in the first place?
The correct approach is to create a procedure or package that does this "extra stuff". Then schedule a job from this trigger to call that procedure.
When the transaction commits, so too is the job to do the "extra stuff". If the trigger is rolled back, so too the submission of the job. And the trigger does not need smelly approaches like autonomous transactions for getting "extra stuff" done.