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I need a NoSQL database to store our files with following specification:
easy Clustring
Distributed
Automatic failover
easily scalable
Fast
I have searched and find some solution like "MongoDB GridFS" or "Riak" but i think i have to research more in both requirement (download server requirements) and solutions.
Has anybody any experience in this fields?
From my (experienced) point of view there are no obvious reasons against MongoDB GridFS. If your files are below 16 MB of size each, I would even store them in a MongoDB collection directly.
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I am planning to create a website which will contain number of documents and each document can be tagged with one or more tags.
I am planning to use mongodb for this. So can you guys suggest me how should I design the backend in mongodb means the database design.
Also could you please suggest any example website which has such kind of functionality that I can use as reference.
Thanks in advance
A very much visible example for this would stackoverflow itself.
It has questions which have many tags.
Example:
{_id:123,link:url,subject:'test subject',desction:'test description',tags:[{name:'mongodb',desc:'mongodb'},{name:'groovy',desc:'groovy'}]}
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I am looking out for a rule engine in perl.
Would like to know what are the features, that should be kept in mind related to the same.
Also the context is a travel domain and the business rule related to it.
Would appreciate your views on the same.
I believe your question is answered at http://www.perlmonks.org/index.pl?node_id=722668 and other places (google for Business Rule engine Perl). Some of the suggestions are:
PIE
Bricks (could not find anything beyond this one site)
VS::RuleEngine
Rule::Engine
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Please recommend free visual modelling tool with reverse engineering feature if such exists.
I've been happy with SchemaSpy for visual modelling. It produces handy reports on the DB structure and relationships, good structural diagrams, and more. See these sample pages from a simple demo database, including this structural diagram . It also has the handy ability to produce smaller structural diagrams specific to each table, showing relationships with that table by one or two degrees of separation.
SchemaSpy works great with PostgreSQL. Just make sure you put the path to the PgJDBC driver jar on the SchemaSpy command line as -dp /path/to/PgJDBC.jar.
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what is the best documented and stable version of nosql technology to use with python or maybe with another programming languages ?
Are there any good tutorials ?
Many thanks.
The two most popular are MongoDB and Redis.
If you have a specialized need there are other choices that are better. But in general those two is what most people want.
There is no unique "NoSQL" solution which fits all requirements. You need to provide more information on what you want to achieve so we can guide into a specific direction.
Nonetheless here are some good databases (which all target a different market actually):
MongoDB, CouchDB, Redis, Cassandra, Riak
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I am looking for a program to build a schema from the newly created database PostgreSQL, preferably with a beautiful design schemes, such as a MySQL Workbench, or change styles schemes.
What can you tell? Thank you!
I'm fairly certain that WWWSQLDesigner can do it for you. There's a demo here. You'll need to download it and install it on a local server.
These three are free and quite good:
pgDesigner: http://pgdesigner.sourceforge.net/en/index.html
SQL PowerArchitect: http://www.sqlpower.ca/page/architect (download without registration from: http://code.google.com/p/power-architect/)
OpenModelSphere http://www.modelsphere.org