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Re: Announcing RDFdb

From: Sergey Melnik <melnik@DB.Stanford.EDU>
Date: Tue, 22 Aug 2000 05:37:56 -0700 (PDT)
To: Guha <guha@guha.com>, Jeen Broekstra <jbroeks@cs.vu.nl>
cc: www-rdf-interest@w3.org
Message-ID: <Pine.GSO.3.94.1000822051715.15707B-100000@Hake.Stanford.EDU>
Guha, Jeen,

the only change I made on Solaris was to include the socket library for
linking, i.e. in makefile, replace

	LIBS     = -ldb -lpthread
	LIBS     = -ldb -lpthread -lsocket

Guha, query optimization for a homogeneous triple store might need some
novel techniques. A traditional DBMS can hardly maintain
useful statistics across all value combinations. Therefore, bad query
plans are often generated. I have some ideas, let's talk about it, 
I'll be back next week.


On Fri, 18 Aug 2000, Guha wrote:

> Hi Sergey,
>  Did you have to make any chage to the code to get it running
> on Solaris?
>  I have plans of supporting reification. Just haven't done it yet.
>  The indexes are currently built on b-trees provided by Sleepycat.
>  I am working on a "nested hash" structure which is more appropriate
> for graphs. The "join algorithm" is fairly straightforward and
> only uses conjunct ordering for optimization. I plan to implement
> a lot of the optimizations used in cyc, lore, etc.
>  Thanks! Do you have any suggestions, advice, etc? We should talk
> about this sometime.
>  Guha
Received on Tuesday, 22 August 2000 08:43:01 UTC

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