RE: brutally simple question - number of triggers on a table
- From: "Powell, Mark D" <mark.powell@xxxxxxx>
- To: Oracle-L <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 22 Apr 2005 10:20:18 -0400
The basic question was to use database table level triggers or not?
Every action that an application takes should leave the data in a valid
consistent state. The reality is that the only way to guarantee enforcement
of complex business rules and data relationships is often to encode these
rules into the database. This is done not just with PK, UK, and FK
constraints but also using database table level triggers especially where an
event driven process must take place.
If the requirement exists that for every change made to Table_A a record of
the change must be kept you do not trust the changing application to record
the change. You encode this into a trigger and the trigger updates an audit
or history table.
Triggers are also useful to enforce referential integrity to a remote
database object.
Every table does not need a trigger. Most in fact probably do not, but
there are times when database level table triggers are the only true
reliable solution to enforcing application data integrity.
IMHO -- Mark D Powell --
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