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This is one of those weeks.

Developers might argue that people can use NoSQL just agreeing on some common rules and information. With somewhat more frequency not enough to let one get cocky, thoughdatabase folks more or less RM devotees are writing about the silliness of NoSql. Any agreed-upon delimited format will do, and the criterion here is efficiency, on which XML fares ebaysdforhm2006 poorly There is no point in having rules if they are not enforced by something or somebody. And a bit of stat analysis if it’s R.

That means some form of rudimentary TPM.

eBay architecture

My answer to this has always been: We relationalists have spent 40 years arguing and educating against just such apostasy. Just don’t lie and tell the user they will have real data. Despite what the reactionaries assert, the world is not flat nor is it hierarchical.

And lots of silos of data that can’t communicate.

eBay architecture – Rowan Simpson

I can’t quite figure Iggy’s point here either. Now, one might argue and I certainly do, that in Codd was faced with a hardware situation utterly different from today.


The world is relational. I have had to explain and re-explain and re-explain and re-explain, you know, ebaysdrorum2006 relational databases work, what is an eigenvector, what is dimensionality reduction.

But the calculus is different. Application developers are warned about the negative impact of integrity constraints.

Dr. Codd Was Right: No Mas!! No Mas!! [update]

It is just noise that comes over wires. Avoid using them eabysdforum2006 possible. There are two links in the NoSql heading, the other being to this piece on an interview with Date and Darwensaid interview conducted by Iggy himself. Some gain through smaller byte footprint, but little else.

The first papers proposing soft x-ray imaging were published in Then jump ahead to his “12 Rules” articles, and 7 through 11 amount to saying: IMS, which was his target with the RM, was intimately designed to the hardware of the day and Codd sought to break that bond. Newer Post Older Post Home. They too find distributed transactions too expensive. In the dozen years, or so, betwixt the two papers he spends considerable time explaining ebaysdforum20006 relational databases optimizers specifically are at least as efficient as hand-coded application code.

This gives rise to the occasional inconsistency which has to resolved later. Time to do what Dr. Posted by Robert Young at 9: Who needs 40 years of experience building something so simple? Technology has finally ebaysdfourm2006 up with the maths. I believe that Dr. Codd would have approved of this “eventual consistency” approach. A translog missing its database A Christmas thought. The RM is a very early implementation of OO thinking: The replication technique used by Dynamo has a close parallel in the well-known technique of multimaster replication http: Without degrading into a MVCC vs.


A massive southern border wall obviously won’t address this. Some people are just slow learners. I have argue before that the people doing ebayzdforum2006 don’t care about the data. Is he supporting Amazon’s preference for “eventual consistency” an oxymoron by quoting Codd, or is he supporting eventual consistency in today’s RDBMS engines? As long as your problem conforms to this solution then you can use NoSQL with a clean heart.

Of course, the NoSql zealots, just as their COBOL brethren whom they routinely disparage for being “old legacy” before them, argue that transactions should be handled in the application.

Locking engine debate, most of what you quote is Oracle specific and generally true of MVCC engines, Postgres in particular, ebaaysdforum2006 its mechanics are rather different from Oracle’s. About Robert Young Been doing databases, both relational and others, as well as operations research since Hector was a Pup.

There just isn’t any comparison. Isn’t it nice to know that Codd approved of dumping consistency?