From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,ee0dc912649d50d4 X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news1.google.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Ada DB bindings and APQ Date: Wed, 15 Dec 2004 18:20:33 +0100 Organization: cbb software GmbH Message-ID: <7snhquz82u0x.1vyp974fukzuc.dlg@40tude.net> References: <1km3c584awura$.y7djkir1ozya$.dlg@40tude.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: individual.net QOo+QNj6RLt02l4XeBq5GQOi9Kja/3YgPNIMoAQY78Da6I1hU= User-Agent: 40tude_Dialog/2.0.12.1 Xref: g2news1.google.com comp.lang.ada:6969 Date: 2004-12-15T18:20:33+01:00 List-Id: On Tue, 14 Dec 2004 21:06:56 +0000 (UTC), Georg Bauhaus wrote: > Dmitry A. Kazakov wrote: >: On Tue, 14 Dec 2004 18:29:16 +0000 (UTC), Georg Bauhaus wrote: >: >:> Dmitry A. Kazakov 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