Create trigger on Oracle from a user that listens to events for another user

问题

I have two Oracle schemas A & B.

Can I create a trigger in schema A that will listen to Create Tables on Schema B? If yes, which grants do I need to do?

回答1:

Yes, you can. The user a needs to have CREATE ANY TRIGGER:

As DBA:

CREATE USER a IDENTIFIED BY a;
GRANT CREATE SESSION, CREATE ANY TRIGGER TO a;

CREATE USER b IDENTIFIED BY b;
GRANT CREATE SESSION TO b;

As a:

CREATE OR REPLACE TRIGGER a.create_trigger
  BEFORE CREATE ON b.SCHEMA
BEGIN
  raise_application_error(num => -20000,  msg=> 'create_trigger vetoes');
END;
/

As b:

CREATE TABLE t(i INT);
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-20000: create_trigger vetoes
ORA-06512: at line 2

You'll have to fine-tune this trigger, it will fire not only for CREATE TABLE but for all CREATE statements...

来源：https://stackoverflow.com/questions/24960225/create-trigger-on-oracle-from-a-user-that-listens-to-events-for-another-user