Description:
Discussing advances in database technology.
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the passing of a champion
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A brilliant man (Erik Naggum) recently passed away far too young. During a nostalgic reading of some of his posts and works related to him, I have run by this wonderful comment of this that I just know many in cdt will appreciate ;-) ...Apparently in his latter years he was working on some relational... more »
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Using the RM for ADTs
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Consider a requirement to record electronic circuits in a relational database. Circuits are abstract mathematical objects (i.e. "values") independent of physical layout. There is no requirement to label individual components (e.g. all 1 ohm resistors are indistinguishable), nor any requirement to label circuit nodes.... more »
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ASONAM 2009 (20-22 July Athens Greece) Call for Participation
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CALL FOR PARTICIPATION ASONAM 2009 20-22 July 2009 Athens, Greece Visit [link] for more details and to download the program The study of social networks originated in social and business communities. In recent years, social network research has advanced significantly; the development of sophisticated techniques for Social... more »
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Checking data consistency in the context of from-to-dimensions
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Hello, I was analyzing the problem of logic in connection with ranges like a price for a certain article which is valid from a certain date till a certain date. Especially in cases where there is not only one from-to- dimension but several I found some results quite interesting to me. I would like to summarize them here to share my results and to see if I... more »
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Call For Participation: WORLDCOMP'09 (The 2009 World Congress in Computer Science, Computer Engineering, and Applied Computing), USA, July 13-16, 2009
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Call For Participation WORLDCOMP'09 The 2009 World Congress in Computer Science, Computer Engineering, and Applied Computing Date and Location: July 13-16, 2009, Las Vegas, USA [link]... more »
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Is a function a relation?
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Since Keith popped up recently, I'm interesting in reopening the question of whether a function is a relation (I have a small point to add). I'm interpreting "is a" in the same way as D&D. i.e. the question is equivalent to asking whether every function value is a relation value. D&D use the CIRCLE and ELLIPSE example to illustrate the idea of type... more »
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Question about SERIALIZE transaction isolation
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Hi, i'm nearly ready for my first release of my new concurrent, multi- threaded, ACID transactional, logical idempotent logging, lock-free database engine (key/value storage). OK, enough buzzwords for today :) Some of you were kind enough to help me a couple of times with my questions. This one is about the behaviour of a read-only transaction... more »
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Coul constraint *enforcement be done at compile time vs runtime ?
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As the subject says... The traditional direct image system approach consists of having relations constraints implemented at the time when the relation is updated meaning during UPDATE/DELETE/INSERT operations. As a part of a research effort to understand better what may be a relational system implementation, I have discovered that it is actually possible to... more »
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Working with idiots can kill you!
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Instead of contributing to the metadiscussion going on in another thread, I decided to start a new one. As a discussion starter, I'm referring you to the following page: [link] If you scroll down just a little way, you'll see a newspaper clip entitled "working with idiots can kill you!".... more »
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Jan, please reply
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...Jan, I appreciate you are very busy and no longer have time for c.d.t. Ordinarily, I would not ask for any of your time. When you snipe like this, does it not at least border on hypocrisy? Are you not creating the very thing you chimed in to agree exists? Do you really think it helps anyone to encourage someone to ignore what... more »
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