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<H1>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</H1>
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<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>
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<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 /*\--
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<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>
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<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>
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