<!-- MHonArc v2.4.4 --> <!--X-Subject: Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ?? --> <!--X-From-R13: "Xba O. Znzoreg" <wyflfvapNvk.argpbz.pbz> --> <!--X-Date: Thu, 26 Mar 1998 05:03:26 +0000 --> <!--X-Message-Id: 199803260503.XAA03939@dfw-ix1.ix.netcom.com --> <!--X-Content-Type: text/plain --> <!--X-Reference: 351865D0.3DEEC3D7#freehold,crocodile.org --> <!--X-Head-End--> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <html> <head> <title>MUD-Dev message, Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</title> <!-- meta name="robots" content="noindex,nofollow" --> <link rev="made" href="mailto:jlsysinc#ix,netcom.com"> </head> <body background="/backgrounds/paperback.gif" bgcolor="#ffffff" text="#000000" link="#0000FF" alink="#FF0000" vlink="#006000"> <font size="+4" color="#804040"> <strong><em>MUD-Dev<br>mailing list archive</em></strong> </font> <br> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] <br clear=all><hr> <!--X-Body-Begin--> <!--X-User-Header--> <!--X-User-Header-End--> <!--X-TopPNI--> Date: [ <a href="msg00901.html">Previous</a> | <a href="msg00903.html">Next</a> ] Thread: [ <a href="msg00886.html">Previous</a> | <a href="msg00836.html">Next</a> ] Index: [ <A HREF="author.html#00902">Author</A> | <A HREF="#00902">Date</A> | <A HREF="thread.html#00902">Thread</A> ] <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> <H1>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</H1> <HR> <!--X-Subject-Header-End--> <!--X-Head-of-Message--> <UL> <LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI> <LI><em>Subject</em>: Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</LI> <LI><em>From</em>: "Jon A. Lambert" <<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>></LI> <LI><em>Date</em>: Thu, 26 Mar 1998 00:06:40 -5</LI> <LI><em>Reply-to</em>: <A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A></LI> </UL> <!--X-Head-of-Message-End--> <!--X-Head-Body-Sep-Begin--> <HR> <!--X-Head-Body-Sep-End--> <!--X-Body-of-Message--> <PRE> On 24 Mar 98 at 21:42, Vadim Tkachenko wrote: > Chris Gray wrote: > > > > [Vadim Tkachenko:] > > > > :- You strictly divide the persistence engine from the logic; > > :- You build the two-tiered system with the logic as a client and the > > :persistence engine as a server; > > :- You build them in such a way that doesn't require them both to be > > :within the same binary (address space, whatever), or build the adaptor > > :which will be within and will connect to the persistence engine outside; > > :- Your problem is fixed, because as soon as you finish that, you don't > > :have a limitation to run those thousands of threads on the same box - > > :you can spread them through several servers. > > > > Some potential problems: > > > > - if multiple threads are updating the single image of the DB > > (whether those threads are local or remote), then you need some > > kind of consistency mechanism. If you use locks, then you are > > vulnerable to a client vanishing when it holds locks - you will > > have to detect that and rip the locks away. > > Sure, that's why there is a concept of a business logic - client doesn't > hold any locks at all. Everything is split into transactions, and any > possible locks are handled by the business logic. > Yes, yes, yes. An excellent way to look at this. Locking strategy and transaction content ARE business logic. Business logic in a mud roughly corresponds to real life activity. Throwing the spear, opening the door, whispering, etc. Many servers resemble a three-tiered system, driver/mudlib/client. -- --/*\ Jon A. Lambert - TychoMUD Internet:jlsysinc#ix,netcom.com /*\-- --/*\ Mud Server Developer's Page <<A HREF="http://www.netcom.com/~jlsysinc">http://www.netcom.com/~jlsysinc</A>> /*\-- --/*\ "Everything that deceives may be said to enchant" - Plato /*\-- </PRE> <!--X-Body-of-Message-End--> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <!--X-Follow-Ups-End--> <!--X-References--> <UL><LI><STRONG>References</STRONG>: <UL> <LI><STRONG><A NAME="00886" HREF="msg00886.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG> <UL><LI><EM>From:</EM> Vadim Tkachenko <vt#freehold,crocodile.org></LI></UL></LI> </UL></LI></UL> <!--X-References-End--> <!--X-BotPNI--> <UL> <LI>Prev by Date: <STRONG><A HREF="msg00901.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg00903.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg00886.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg00836.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="index.html#00902"><STRONG>Date</STRONG></A></LI> <LI><A HREF="thread.html#00902"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> <ul><li>Thread context: <BLOCKQUOTE><UL> <LI><STRONG>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</STRONG>, <EM>(continued)</EM> <ul compact> <LI><strong><A NAME="00830" HREF="msg00830.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 22 Mar 1998, 21:10 GMT </LI> <LI><strong><A NAME="00833" HREF="msg00833.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 23 Mar 1998, 06:54 GMT <UL> <LI><strong><A NAME="00864" HREF="msg00864.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 23 Mar 1998, 21:42 GMT </LI> <LI><strong><A NAME="00886" HREF="msg00886.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 25 Mar 1998, 05:28 GMT <UL> <LI><strong><A NAME="00902" HREF="msg00902.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Thu 26 Mar 1998, 05:03 GMT </LI> </UL> </LI> </UL> </LI> <LI><strong><A NAME="00836" HREF="msg00836.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Mon 23 Mar 1998, 07:07 GMT <UL> <LI><strong><A NAME="00839" HREF="msg00839.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Ross Nicoll <a href="mailto:jrn#st-andrews,ac.uk">jrn#st-andrews,ac.uk</a>, Mon 23 Mar 1998, 08:09 GMT </LI> <LI><strong><A NAME="00845" HREF="msg00845.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Mon 23 Mar 1998, 18:05 GMT </LI> <LI><strong><A NAME="00882" HREF="msg00882.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>, Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Wed 25 Mar 1998, 05:02 GMT </LI> </UL> </LI> </ul> </LI> </UL></BLOCKQUOTE> </ul> <hr> <center> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] </center> <hr> </body> </html>