Triggers problem - please help - urgent !!

Question

To all experts, please help me with this problem - need answer
urgently. Thanks in advance.
Using Oracle 8 Rel 8.0.6
I have 2 tables (table Y, table Z).
In the 'after insert upd del on each row trigger' (lets call it
AIUD trigger)on table Y, based on certain criteria, I insert a
record in table Z.
New requirement is that whenever a record is inserted in table Z
(fyi, inserting any record in table Z is possible only when
records are inserted in table Y as mentioned earlier thro the
AIUD trigger - i.e. there is no frontend way to insert records
in table Z), if certain (new) criteria is satisfied, I should
insert 1 record in both, table Y and table Z.
I tried to create meet the new requirement by adding code to
existing AIUD trigger but ran into mutating tables error. So I
dropped this idea.
I have now created 'after insert on each row trigger' (lets call
it NEW_TRIGGER) on table Z to meet the new requirement but have
these 2 problems :
1) the trigger always compiles with errors
2) if I still go ahead and insert a record in table Y, I get the
foll error msgs :
ORA 4098 - NEW_TRIGGER is inv
ORA 6512 at line xxx on AIUD
ORA 4088 error during execution of trigger AIUD
What is the best way to work on this requirement or what am I
doing wrong ?
Thanks again,
AG.

Answer 1

Your restatement of the problem merely confirms what the previous
posting said. You cannot write a trigger on table Y that inserts
a record into table Y: that's the mutating trigger problem
(there's oodles of postings on the subject, not to mention
online Oracle docs). You could write a trigger on table Z that
inserts into table Y - but you need to be able to see the value
I3 which (presumeable) you can't.
One solution is to use code the trigger on table Y to submit a
call to DBMS_JOB which initiates a procedure that inserts a
record into table Y.
You must remember that the new record in table Y must never
include the value I3, otherwise you'll end up w/ an infinite
loop.
rgds, APC