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Questions tagged [nosql]

NoSQL (sometimes expanded to "not only sql") is a broad class of database management systems that differ from the classic model of the relational database management system (rdbms) in some significant ways.

NoSQL (sometimes expanded to "not only ") is a broad class of database management systems that differ from the classic model of the relational database management system () in some significant ways.

NoSQL systems:

  • Specifically designed for high load
  • Natively support horizontal scalability
  • Fault tolerant
  • Store data in denormalised manner
  • Do not usually enforce strict database schema
  • Do not usually store data in a table
  • Sometimes provide eventual consistency instead of ACID transactions

In contrast to RDBMS, NoSQL systems:

  • Do not guarantee data consistency
  • Usually support a limited query language (subset of SQL or another custom query language)
  • May not provide support for transactions/distributed transactions
  • Do not usually use some advanced concepts of RDBMS, such as triggers, views, stored procedures

NoSQL implementations can be categorised by their manner of implementation:

Free NoSQL Books

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Uses of NoSQL database in data science

How can NoSQL databases like MongoDB be used for data analysis? What are the features in them that can make data analysis faster and powerful?
10land
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The data in our relational DBMS is getting big, is it the time to move to NoSQL?

We created a social network application for eLearning purposes. It's an experimental project that we are researching on in our lab. It has been used in some case studies for a while and the data in our relational DBMS (SQL Server 2008) is getting…
ePezhman
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What is the difference between Hadoop and noSQL

I heard about many tools / frameworks for helping people to process their data (big data environment). One is called Hadoop and the other is the noSQL concept. What is the difference in point of processing? Are they complementary?
рüффп
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When a relational database has better performance than a no relational

When a relational database, like MySQL, has better performance than a no relational, like MongoDB? I saw a question on Quora other day, about why Quora still uses MySQL as their backend, and that their performance is still good.
Filipe Ferminiano
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Is this Neo4j comparison to RDBMS execution time correct?

Background: Following is from the book Graph Databases, which covers a performance test mentioned in the book Neo4j in Action: Relationships in a graph naturally form paths. Querying, or traversing, the graph involves following paths. Because of…
blunders
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What is the most efficient data indexing technique

As we all know, there are some data indexing techniques, using by well-known indexing apps, like Lucene (for java) or Lucene.NET (for .NET), MurMurHash, B+Tree etc. For a No-Sql / Object Oriented Database (which I try to write/play a little around…
sihirbazzz
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Python interface to Titan Database

How can I connect to Titan database from Python ? What I understand is that Titan (Graph database) provides an interface (Blueprint) to Cassandra (Column Store) and bulb is a python interface to graph DB. Now how can I start programming in python…
Sreejithc321
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What is the Best NoSQL backend for a mobile game

What is the best noSQL backend to use for a mobile game? Users can make a lot of servers requests, it needs also to retrieve users' historical records (like app purchasing) and analytics of usage behavior.
Filipe Ferminiano
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is this a good case for NOSQL?

I'm currently facing a project that I could solve with a relational database in a relatively painful way. Having heard so much about NOSQL, I'm wondering if there is not a more appropriate way of tackling it: Suppose we are tracking a group of…
nassimhddd
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Data store for testing data products?

Is there a recommended approach for storing processed data for testing new data products? Basically, I'd like to have a system where a data scientist or an analyst could think of a new data product to present to users, do the data processing to…
bobfet1
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Seeking advice on database architecture -- given my problem, what tools should I learn?

I'm a fairly experienced R user, but until now I haven't had a good reason to learn to use databases. Now I have a problem where I am dealing with model output that I need to save to disk, and then query for another process. If the data were…
generic_user
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Is there an overview over recommender system architectures?

I want to learn more about the recommender system topic. I am very interested in the usage of different database systems for this use case. My problem is that I cannot find a good overview of different architectures of recommender systems,…
TobiasJakob
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Data representation (NoSQL database?) for a medical study

Problem description I have a data set about 10000 patients in a study. For each patient, I have a list of various measurements. Some information is scalar data (e.g. age), some information is time series of measurements, some other information can…
Karel Macek
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NoSQL vs SQL backend for semi structured data

I have a corpus of job descriptions and another corpus of CVs of applicants. I plan to implement a matching system using machine learning algorithms, to find top 5 or top 10 applicants for each job description. Should I store the data in a document…
aamir23
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Designing a data science workflow for a small company

I work at a company with eight employees, and was recently hired as a data/business analyst. The company uses an in-house software to manage online retail sales. There is a huge amount of data available, and I need to design a workflow to capture…
Kelsey
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