INSERT trigger for inserting record in same table

Question

I have a trigger that is fire on inserting a new record in table in that i want to insert new record in the same table.
My trigger is :

create or repl         


        

Answer 1

Mutation happens any time you have a row-level trigger that modifies the table that you're triggering on. The problem, is that Oracle can't know how to behave. You insert a row, the trigger itself inserts a row into the same table, and Oracle gets confused, cause, those inserts into the table due to the trigger, are they subject to the trigger action too?

The solution is a three-step process.

1.) Statement level before trigger that instantiates a package that will keep track of the rows being inserted.

2.) Row-level before or after trigger that saves that row info into the package variables that were instantiated in the previous step.

3.) Statement level after trigger that inserts into the table, all the rows that are saved in the package variable.

An example of this can be found here:

http://asktom.oracle.com/pls/asktom/ASKTOM.download_file?p_file=6551198119097816936

Hope that helps.