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From: veem v <[email protected]>
To: pgsql-general <[email protected]>
Subject: Question on trigger
Date: Thu, 11 Apr 2024 20:01:23 +0530
Message-ID: <CAB+=1TV2rVqySeVeviDfoKc0ApiLPQ9=i=5PM9R6ek-_aKuhOg@mail.gmail.com> (raw)

Hi, We used to use Oracle database in which we had audit triggers(something
as below) mandated for all tables by the control team. Now we are going to
use the postgresql 15.4 database for one of our applications. So,wanted to
understand if there exists any downside of such audit trigger setup for all
the tables? Will it impact the bulk data insert/update/delete OR slowdown
of any of the DML operations significantly (and thus will not be advisable
to use for all tables but selected ones)?

CREATE OR REPLACE TRIGGER TAB_AUD_TRG
  BEFORE DELETE OR INSERT OR UPDATE
  ON tab
  FOR EACH ROW
BEGIN
      IF inserting THEN
        :NEW.create_timestamp := systimestamp;
        :NEW.create_userid  := sys_context('USERENV','SESSION_USER');
        :NEW.update_timestamp := systimestamp;
        :NEW.update_userid := sys_context('USERENV','SESSION_USER');
      ELSIF updating THEN
        IF  updating('create_userid') OR updating('create_timestamp') THEN
            :new.create_userid   := :old.create_userid;
            :new.create_timestamp  := :old.create_timestamp;
        END IF;
        :NEW.update_timestamp := systimestamp;
        :NEW.update_userid := sys_context('USERENV','SESSION_USER');
      END IF;
  END;
/

Regards
Veem

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