Re: Ada DB bindings and APQ

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Tue, 14 Dec 2004 21:06:56 +0000 (UTC), Georg Bauhaus wrote:

> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>: On Tue, 14 Dec 2004 18:29:16 +0000 (UTC), Georg Bauhaus wrote:
>: 
>:> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>:>: On Tue, 14 Dec 2004 02:25:22 -0500, Warren W. Gay VE3WWG wrote:
>:>: Yep, the first error one gets: lpq not found. libpq.a is not distributed
>:>: with GNAT. This might become a problem in the future.
>:> 
>:> I'm not at all surprised that when I use a binding but not the bound
>:> thing, I'll get an error.
>: 
>: Does your OS complain about all devices you could potentially attach via
>: USB?
> 
> It is surprising if binding to the operating system fails.
> Driver not installed?

APQ <-> USB
PosgreSQL <-> Mouse
MySQL <-> USB Stick

>:>: Yes, but from user's perspective, at least one query per connection is
>:>: always necessary. In some cases the user will need more, but not so often.
>:> 
>:> I doubt this very much. Indeed, we have a server type application
>:> that does not work at all without a connection pool, because performance
>:> is affected rather drastically when you control connections.
>: 
>: OK, but this does not contradict my point.
> 
> When you said, "but not so often," and I said, "doubt this very much",
> (then gave just one example) I wanted to say that many DBes typically
> _are_ queried frequently, in Hz.

OK, but how this might disprove that each connection needs at least one
query?

> But then at the end of your post you write that you envision a distributed
> application that stores data in the net. Is this the point from wich
> you argue? Quoting Warren, "You seem to be at cross purposes," maybe?

The point is that separation of queries and connections in API is
superfluous.

> Have you had a chance to study Tanenbaum's et aliorum distributed systems
> reasearch (Amoeba, The Globe, ...)?

I know Andy's works.

> There should be plenty of information, including a language study
> comparing Ada's protected objects and Orca's shared data objects
> in distributed systems.
> 
> http://www.cs.vu.nl/pub/papers/[orca/]

As I said before, that is a very long term perspective. When distributed
systems finally come, they will eliminate the very notion of data base.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de