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-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,3cd3b8571c28b75f X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-09-05 12:29:43 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!wn14feed!worldnet.att.net!204.127.198.204!attbi_feed4!attbi.com!sccrnsc01.POSTED!not-for-mail Message-ID: <3F58E38A.4000007@attbi.com> From: "Robert I. Eachus" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: A Customer's Request For Open Source Software References: <3F44BC65.4020203@noplace.com> <20030822005323.2ff66948.david@realityrift.com> <3F4828D9.8050700@attbi.com> <3F4EA616.30607@attbi.com> <3F512BD1.8010402@attbi.com> <3F52AA5F.8080607@attbi.com> <3F5559A4.8030507@attbi.com> <34p5b.8361$Kj.843491@news20.bellglobal.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit NNTP-Posting-Host: 24.34.139.183 X-Complaints-To: abuse@comcast.net X-Trace: sccrnsc01 1062790035 24.34.139.183 (Fri, 05 Sep 2003 19:27:15 GMT) NNTP-Posting-Date: Fri, 05 Sep 2003 19:27:15 GMT Organization: Comcast Online Date: Fri, 05 Sep 2003 19:27:15 GMT Xref: archiver1.google.com comp.lang.ada:42188 Date: 2003-09-05T19:27:15+00:00 List-Id: olehjalmar kristensen - Sun Microsystems - Trondheim Norway wrote: > Actually, one may say that the log IS the database, all the > rest is there only to give faster access to the latest version. Very good. I am used to calling it the transaction journal, but I am very leery of any DBMS whose state cannot be uniquely recovered from the journal, or and earlier save, and the journal entries since. And yes, it has been true for at least 15 years that some databases will allow you to commit transactions by journalling them in persistant memory. > There can be only One. For databases, make that there can only be one version of the database at any point in time. ;-) -- Robert I. Eachus "As far as I'm concerned, war always means failure." -- Jacques Chirac, President of France "As far as France is concerned, you're right." -- Rush Limbaugh