[gidan]

Moving business logic lower at the database level. Mainly for better performance at the cost of code more difficult to deal with.

[eska]

The bigger reason seems to be avoiding to write boiler plate code.

[pojzon]

*worse performance, because you drop more things that often happen before accessing db -> on the level of database - Simple as that its not going to spend 100% computing power on things you would expect it to..

So you get worse performance and harder to maintain code.