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One of the reasons why referential integrity should not be enforced is performance. Because Db has to validate all updates against relationships, it just makes things slower but what are the other pros and cons of enforcing and not enforcing?
Because relationships are maintained in the business logic layer anyway, it just makes them redundant for db to do it. What are your thoughts on it?
The database is responsible for data. That’s it. Period.
If referential integrity is not done in the database, then it’s not integrity. It’s just trusting people not to do bad things, in which case you probably shouldn’t even worry about password-protecting your data either 🙂
Who’s to say you won’t get someone writing their own JDBC-connected client to totally screw up the data, despite your perfectly crafted and bug-free business layer (the fact that it probably won’t be bug-free is another issue entirely, mandating that the DB should protect itself).