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,e686c2c95beefb1c X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news2.google.com!fu-berlin.de!uni-berlin.de!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Inserting Calendar.Time in a database Date: Wed, 25 Aug 2004 11:25:28 +0200 Message-ID: <34dzl9dpx3w0.4ghwziy6e7p9$.dlg@40tude.net> References: <1jgik0ntrex36$.1pyha1husddpe.dlg@40tude.net> <412c4958_1@baen1673807.greenlnk.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de LC7HZ8FY9IZ4hm/A1HMjNAS35EXrwxgYheuqlExGA4w9MbGCE= User-Agent: 40tude_Dialog/2.0.12.1 Xref: g2news1.google.com comp.lang.ada:2986 Date: 2004-08-25T11:25:28+02:00 List-Id: On Wed, 25 Aug 2004 09:18:40 +0100, Martin Dowie wrote: > Dmitry A. Kazakov wrote: >> It is a requirement when UTC is used for time stamping. > > sounds more like a requierment of your system than of UTC itself to me, i.e. > each loggable event must be uniquely tagged. You can always have a suitably > faster counter (with a know Fx and usually '0' at power on :-) and then add > this to a UTS synchronisation event. This works only locally. Consider a distributed data acquisition and control system. You measure some data at physically distinct places. The sensors and actors are interconnected using say Ethernet. Ada is the best candidate for implementing nodes of the system, right? Now, how would you ensure data consistency across the system? A practical example, is a mileage dynamometer. A test runs for weeks. Maximal data frequency is say 1 kHz. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de