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Closed 10 years ago.
My question seems to be dump, but because i was studying this new technique, i've found that NoSql has changed from its beginning, for example, in the beginning there was the problem of see your own update, and for example Facebook dident let users to update their comments due to the write once, read many
So, do i change all concepts that i've read in 2010-2012 tutorials?
Has NoSql beat the CAP theorem ?
I agree this can easily turn into discussion. I'll give brief answers from my experience to your two questions:
No, the concepts haven't changed. The landscape seems to be growing quite a bit as lots of companies get into the NoSQL space. Beware vendor promises!
No way. Just read this article this morning, it is a great explanation on some of the issues with the CAP theorem: http://codahale.com/you-cant-sacrifice-partition-tolerance/
Related
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Closed 9 years ago.
I've been looking around for a Mortgage Payoff calculator and it looks like the ones that are available are primarily commercial. Does anyone know if it already exists somewhere in script form that could be translated into another language?
If not, is anyone familiar enough with the logic that wouldn't mind sketching up the pseudo-code? I'll be able to script everything together once it's laid out but all searching I've done so far has only turned up results for creating an Mortgage (not payoff) calculator.
In addition to the obvious utility, hopefully putting this logic out there will help people better understand how their mortgage is being calculated.
http://www.r-bloggers.com/mortgage-calculator-and-amortization-charts-with-r/
The amortization shows you the remaining principal which is the same as the payoff amount.
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Closed 11 years ago.
We have requirements that force us to have two layers of databases. A good caching solution backed by large distributed database. We are thinking to use redis for fast read and write. We are not yet settled for the database at backend, however we would prefer it to have following properties:
consistent over time.
robust (no data loss).
reasonably fast read.
distributed.
We are exploring cassandra and Mongodb as our options. Hbase might be a option too. Kindly let us know your views/ current state of work. We are expecting some comparative analysis which could be like in http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis , but should be more upto date and can give us better insight. An example usecase could be like when someone post a comment in facebook. The comment is then visible to all its friends in real time.
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Closed 11 years ago.
I am working on a project and as I want it to be hassle free so I am considering using Amazon SimpleDB for the sake of simplicity. At least I can cross out DB administration.
But why there is so little info about SimpleDB on the net? As if nobody cares about it and I feel like I might be on the wrong track. Is it so unpopular? The other major NoSQL databases have a lot more coverage. What could be the reason? Is it because it is hosted? Does it lack major important features which I don't notice? Is it horrible performance-wise? Is it not durable? Why people are not very interested? Are there better alternatives for hosted NoSQL?
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Closed 10 years ago.
Can anyone recommend me some good tutorial regarding SOM? I googled up some, but I'm not very satisfied with them.
Thanks,
proper
What are you looking for in particular and what language are you using?
One of the easiest explanations of SOM involve the automatic mapping of similar colours as described here and here. I always liked AI-Junkie's site which also demonstrates the colour classification. Try and understand why the colours merge as that is probably the 'hello world' equivalent in Self-Organizing Maps.
Is there something in particular you don't understand?
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Closed 10 years ago.
Does anyone know of a real good SSMS Add-In that beautifies T/SQL, isn't too expensive and also does things around best practices for T/SQL formatting?
I'm well aware of Red Gate's tool, but ~$300 is quite a killer amount.
http://www.red-gate.com/products/SQL_Refactor/index.htm
I've seen this Add-In, but it's purely about indentation.
http://www.wangz.net/sqlpp/ssmsaddin.html
Neither solution addresses the commenting and header best practices.
I came across this tool:
http://www.apexsql.com/sql_tools_refactor.asp
It's pretty good for a free product. Nothing beats the Red Gate tools however.
Have you tried SQL Enlight?
These ones have some basic features
http://www.sqlinform.com/free_online_sw.html
http://www.dpriver.com/pp/sqlformat.htm