Slow down on operation whith table and trigger

hello,
Is anyone knows the reason why, when manipulating a lot of rows on a table (DELETE for exemple) the processing time is increased when exists a trigger on the table, even if it is a before insert trigger (which have no reason to fire in a DELETE command) ?

With this trigger (before insert but the SQL order is DELETE...) it's 2 hours to delete 40.000 rows and CPU is 100%
when i deactive this trigger, it's a few minutes....

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>
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Ajay Sharma wrote:
Hi All
We are recording all the data that is being updated or inserted into a Table, (say Table A) by inserting into a custom table whenever an insert or update comes in the trigger.Now suppose a user while updating the data in Table A just fetches the record on front end and click on apply directly without making any changes. This causes an update on Base Table and hence causes an insert into our custom table. As this data is of no use to us..
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2)When user updates any column then we are picking all the new values into a record type datatype and same way latest value from custom table.Then performing minus between these two records by making query from dual.
Please let me know if there could be any other way around..
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