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On Wednesday 21 April 2004 10:28 am, Andrew Sullivan wrote:
> On Wed, Apr 21, 2004 at 11:23:51AM -0400, Jan Wieck wrote:
> > for that is NOT performance. SAP spends that effort multiple times by
> > implementing their own, custom integrity control and data domain system
> > in the DB abstraction layer, to gain DB vendor independence. That
> > abstraction layer is larger than PHP and Apache together, so this
> > example is IMHO totally irrelevant for the typical MySQL user.
>
> Actually, I think it _is_ relevant. It's proof, IMNSHO, that the
> strategy of "doing it in the client" is completely bankrupt. It's
> one thing to do it this way if you have software which is a
> category-killer the way SAP is, because you can afford the overhead
> of all those developers doing all that extra work, and you can make
> your customers buy trillion-dollar hardware to run your bloated
> masterpiece. The Rest Of Us, however, need to do things efficiently,
> and that means doing the work in the place where it is least likely
> to need to be checked again. For most database applications, that's
> inside the database. (I'll not now start my rant on the mess caused
> by developers who are careless with this principle.)
I concur. However the problem SAP had some 18years ago when they invented
their system were massive differences between databases. The scope they had
in mind didn't allow for whole database layers to be redundant just for the
sake of being able to talk to several database engines - ergo they wrote one
layer and omitted using vendor dependant database features.
Nowadays most relevant databases are pretty compatible when it comes to
constraints, so if you stick to the basics you should be fine now.
UC
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