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Comment: Re:Not getting RDMS (Score 1) 283

by lewiscr (#40030509) Attached to: Moving From CouchDB To MySQL

When interacting with the data from outside the database, you use a view, which can be engineered to appear to contain NULLs, duplicate rows, and so forth.

One of the base tenants of relational theory is that a view is indistinguishable from a base table. You can take 2 tables and make a view using them. Or you can flip it around, have a single base table and 2 views that resemble the original tables. Both methods are equally valid, and a user querying the data can't tell the difference.

Until you outlaw NULLs in base tables. Now base tables and views are not interchangable.

I agree that NULLs shouldn't be stored in a table, but I also believe that I should be allowed to hurt myself if I really want to. I don't want to do it, but it's just too slow to do it the correct way. So I compromise now, submit a bug report, and revisit when performance improves. And future-me swears at past-me for doing it.

Education

Automated Dorm Room Causes a School Inquiry 170

Posted by samzenpus
from the dorm-of-tomorrow dept.
First time accepted submitter ElectronicHouseGrant writes "Freshman Derek Low rigged up his Berkeley dorm room with something he calls B.R.A.D., which is short for 'Berkeley Ridiculously Automated Dorm.' The room includes automated lighting, drapes, music, motion detection, and more. He can control everything through voice recognition, but a wireless remote, his iPhone and his iPad are also in on the control party. Derek started the install on February 4 and finished just a few days ago."

Comment: Re:Well that and if your lucky like I am (Score 1) 380

by lewiscr (#39592285) Attached to: Millions of Subscribers Leaving Cable TV for Streaming Services

The tv signal is there no matter what. Stealing isn't the right word to describe what he's doing. Breach of contract is probably more appropriate.

Most cable companies are required to carry the Over The Air channels on the same channel numbers. It's generally part of the local monopoly contract the municipality negotiates with the cable company. If his contract says he can't watch those channels, it's probably unenforcable. A fine example of clauses companies put in contracts, assuming you don't know your legal rights.

Data Storage

Ask Slashdot: How Do You Manage Your Personal Data? 414

Posted by timothy
from the it's-2012-how-do-you-back-up? dept.
New submitter multimediavt writes "Ok, here's my problem. I have a lot of personal data! (And, no, it's not pr0n, warez, or anything the MPAA or RIAA would be concerned about.) I am realizing that I need to keep at least one spare drive the same size as my largest drive around in case of failure, or the need to reformat a drive due to corrupt file system issues. In my particular case I have a few external drives ranging in size from 200 GB to 2 TB (none with any more than 15 available), and the 2 TB drive is giving me fits at the moment so I need to move the data off and reformat the drive to see if it's just a file system issue or a component issue. I don't have 1.6 TB of free space anywhere and came to the above realization that an empty spare drive the size of my largest drive was needed. If I had a RAID I would have the same needs should a drive fail for some reason and the file system needed rebuilding. I am hitting a wall, and I am guessing that I am not the only one reaching this conclusion. This is my personal data and it is starting to become unbelievably unruly to deal with as far as data integrity and security are concerned. This problem is only going to get worse, and I'm sorry 'The Cloud' is not an acceptable nor practical solution. Tape for an individual as a backup mechanism is economically not feasible. Blu-ray Disc only holds 50 GB at best case and takes forever to backup any large amount of data, along with a great deal of human intervention in the process. So, as an individual with a large data collection and not a large budget, what do you see as options for now (other than keeping a spare blank drive around), and what do you see down the road that might help us deal with issues like this?"

Comment: Re:This just in! (Score 1) 235

by lewiscr (#39355113) Attached to: Companies More Likely To Outsource Than Train IT Employees

Meanwhile,
http://www.ctj.org/html/gwb0602.htm
top 1% Average income $1,495,000 per year

From that link, $518,000 a year gets you into the 1% club. From there, you have to claw your way into the 0.5% club that starts at $1.5M. It doesn't materially affect your arguement though.

For me, I really don't care about the magic "1%" number. I care about having enough money to do what I want, and saving for 30-40 years will get me there.

BTW, thanks for the link. I'd always had questions about the statistics of "what it means to be in the 1%". Like, "is that number average or median?", etc. This answers some of those questions.

Comment: Re:From my understanding... (Score 1) 151

by lewiscr (#39272383) Attached to: Mysterious Dark Matter Blob Confounds Experts

Sorry for the fast thinking here. I'd written a much longer post, but /. ate it when I tried to login.

What is the psuedo-distance between branes?

We know that gravity's effects drop of as distance^2. Working under the theory that gravity propigates at the speed of light, we can measure brane distance in light seconds. If branes are only a light-second away, there's too much mass. Too many branes too close together would turn everything into a black hole.

If we assume some non-trivial distance between branes, say 1000 light years, then that could explain the distribution of regular vs. dark matter. I don't feel like integrating galactic masses over distance^2 right now, but the ratio of regular vs. dark matter should be able to tell us how far apart branes are.

Rolling with 1000 light years (an order of magnitude doesn't affect this thought experiment). Larger structures (galaxies, clusters, etc) would be gravitationaly bound cross-brane, but smaller structures (stars) would not.

That's enough n-dimensional physics for me tonight.

Comment: Re:From my understanding... (Score 1) 151

by lewiscr (#39254199) Attached to: Mysterious Dark Matter Blob Confounds Experts

The Galactic Rotational Velocity implies that dark matter is something different than standard matter, not just invisible matter. I'm broadly covering all forms of invisible matter here, cold-dark matter, non-baryonic matter, matter in other branes, etc.

Using your idea with the galactic rotational curve, the thought exercise would not yield the required mass distribution to explain the rotational curve.

Now, if we posit that nearby branes don't necessarily have the exact same physical constants, that could result in brane-sibling galaxies having different shapes depending on the local physics. While interesting, we're well into the realms of science fiction.

In short, I like you idea, and need to think about it some more.

Comment: Re:Christ, (Score 1) 652

by lewiscr (#39203093) Attached to: Rearview Car Cameras Likely Mandated By 2014

I don't see why a monitor is necessary to display oil pressure or some other parameter - just have a gauge. If the parameter is binary, then use a light to indicate that it's good/bad.

The cheap cars have an "oil light" instead of a gauge. The light turns on before complete engine seizure, but after the engine is effectively destroyed.

I can only assume that this is a cost cutting measure, since the light uses almost as much dashboard real estate as a dial. I would hope that manufacturers would be willing to add a better sensor and software gauge, but I can't say what the cost delta is between the 3 options.

Politics are almost as exciting as war, and quite as dangerous. In war, you can only be killed once. -- Winston Churchill

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