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Trigger firing order tips

Oracle Database Tips by Donald BurlesonSeptember 5, 2015

 I have two insert triggers on my table, a row level trigger and a regular DML trigger.  Upon insert, which trigger will fire first?


Answer:  The Oracle documentation is ambiguous about the firing order of triggers.  Oracle 11g PL/SQL and beyond will allow you to specify trigger firing order.


In 11g and beyond there is a "follows" and "precedes" syntax that you can use to control the order in which triggers are executed:


--  This set trigger order firing sequence for one that follows
--  trigger_test_2
create or replace trigger

before insert on
for each row

   follows trigger_test_2
    . . .

create or replace trigger

before insert on
for each row

   precedes trigger_test
    . . .

Another sure-fire way to guarantee the firing order of triggers is to encapsulate then into stored procedure and attached the stored procedure as a single trigger.  This will guarantee the firing sequence of triggers. 


Displaying the firing order of triggers


There is also an dba_trigger_ordering dictionary view that displays the sequence that triggers are fired when they are defined with the "follows" or "precedes" clause:




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