Are triggers evil?

Hi,
A friend who works directly with Oracle told me everything must be done in order to try to avoid using triggers, but I couldn't understand why.
I'm not an Oracle (or any other database) expert, but I can understand that a trigger is a block of code that is executed for every insert, update or delete (I know you can say when to run it when you create it), so you have to be cautious not to run things too complicated or to "heavy" in order to not make the whole database slow. But, again, I think you need to be cautious with what your triggers are doing, but you don't need to avoid using them.
Is there anything I am missing?
Thanks in advance,
João Toledo

Hi,
Triggers have been/are being used in an inappropriate way very often, causing unexpected side-effects.
Many examples regarding why they've been used the wrong way have been explained by Thomas Kyte.
You can find articles and explanations on his site:
http://asktom.oracle.com
(do f.i. a search on "i hate triggers" ;) )
and on his blog:
http://tkyte.blogspot.com/2006/09/classic-example-of-why-i-despise.html
More regarding this subject can simply be googled, like:
http://rwijk.blogspot.com/2007/09/database-triggers-are-evil.html
A link showing the opposite is possible
http://thehelsinkideclaration.blogspot.com/2009/04/helsinki-code-layers-in-dbms.html
edit
Actually it goes for everything, not only triggers:
When applied inappropriatly or without realizing possible consequences, evil can (Murphy says "ultimatly *will*") happen.
It goes for triggers, for hints, for EAV, for a WHEN OTHERS then NULL etc...
Edited by: hoek on Nov 8, 2009 2:17 PM

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