A catch-all term describing database systems using various non-relational models. Such systems are usually engineered to be high-performance.

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1answer
37 views

A good dataset to experiment NoSQL databases [on hold]

I need to do some experiments in HBase and Cassandra and to do that I need an adequate dataset. The dataset I'm looking for has to be large enough (i.e. more than 2GB) and the data in it has to be ...
1
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2answers
177 views

Working NoSQL scheme for a betting app

I'm building an app where a user can bet on the result of a sports game. Basically, we feed the database with competitions and games, and the users can place their bet in the form of a score ...
1
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1answer
224 views

Elasticsearch: Versioning a document on revisions

I currently have a document which gets revised regularly, I want to keep track of the document by keeping each old version of the document. So if document A has a summary and update date I want to, ...
0
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1answer
26 views

how to make secondary slave as readable in MongoDB?

How do I make a secondary slave as readable in MongoDB? We can do this via shell command rs.slaveOk() But how we can do it permanently for all session via config file?
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0answers
27 views

What kind of database is Cassandra DB?

I was taking some courses to understand better the way Cassandra works (at academy.datastax.com) and by what I gathered it came to me that it is a Key Value Database because of the way it stores data ...
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0answers
8 views

AWS DynamoDB structure and operations for product filtering

I'm having trouble with finding the right pattern to use in a "product" table. The site should be able to sort the products on date and price (asc and desc order). Besides that a user can apply a ...
0
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1answer
836 views

Can I copy a collection in mongoDB from one database to another by copying the db files directly?

I tried using cloneCollection http://docs.mongodb.org/manual/reference/command/cloneCollection/ , but clonecollection takes a lot of time in case of big collection because it starts indexing the data. ...
0
votes
1answer
102 views

Two types of data, so two type of databases?

For a social network site, I need to propose a DB. The application is written in Java & will be hosted on VPS(s) initially. Broadly classified there is two type of data to be stored at backend: ...
0
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1answer
52 views

updating single row in MYSQL

We have a situation where we need to update on a single row several thousands time a second and this requirement lasts continuously for 5 hours every day due to the nature of the business. Design ...
0
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1answer
2k views

Storing multidimensional array in MongoDB

I am attempting to convert a large MySQL database of product information (dimensions, specifications, etc) to MongoDB for flexibility and to move away from the restriction of a column based table. I ...
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2answers
137 views

Loading XML data from SQL Server directly into MarkLogic?

Has anyone loaded XML data from SQL Server to a MarkLogic document store? This would be preferable to dumping XML to file system and then using mlcp. Maybe with SSIS?
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2answers
2k views

Is NoSQL a replacement for traditional SQL, or an addition? [closed]

I've been reading up on NoSQL, but I can't figure out one thing. Is it meant to be a replacement for traditional SQL, or is it meant to be used in conjunction with it? Basically, what I'm asking (I ...
1
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1answer
35 views

MongoLab: Does hardware effect performance of a find() query [closed]

I asked a pervious question on StackOverflow about if document size affected the performance of fetching that document (the document is 3MB in size) ...
19
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2answers
12k views

Timeseries: SQL or NoSQL?

I don't care about the general differences between SQL and NoSQL (or their traditional differences). I am currently looking at altering the storage of our internal time series. They all contain ...
1
vote
1answer
255 views

Improve the insertion rate of mongo sharded cluster

I can't disable the write concern while i mongorestore with .bson file. It totally damages the insertion rate (insert/sec). This is my sharding status. mongos> sh.status() --- Sharding Status --- ...
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0answers
17 views

In face of a network partition (P), does Neo4J HA allow read stale data?

In Neo4j docs it says that it is partition tolerant, but in further descriptions their docs does not make clear what happens if a network partition occurs. It enables a fault-tolerant database ...
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0answers
34 views

Challenged with modeling a big DB

I'm tasked to develop a gaming web application system with relatively large database - it should hold the data about 300 million players, the orders/payment of each player - ~3B records - , and other ...
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0answers
30 views

Couchbase data modeling

I come from the Relational DB world (SQL), and I'm getting started with NoSQL. So please consider that when answering. I have two Buckets: Apps and Users. A user may be subscribed to N ...
0
votes
1answer
29 views

Expand a date range in mongodb

I have a document structure like { "startDate": ISODate("2015-01-01T00:00:00Z"), "endDate" : ISODate("2015-01-10T00:00:00Z"), "foo" : "bar" } Is it possible to expand the date range like ...
0
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1answer
81 views

Optimizing an Informix query — Specify architectural solutions if possible too (like caching service)

We have a huge query on an Informix database that is not performing well. The query is doing a join of 9 different tables. Maximum row count is just 40,000 rows. The query also has 9 sub-queries, and ...
2
votes
1answer
39 views

Is there any database with versioning (column based) built in?

I'm wondering if there is a database (SQL or NOSQL) which provides versioning for for the records ( if the column/field/property is enabled for versioning). I'm developing an authentication software ...
1
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0answers
152 views

Best database for fast read all in one table [closed]

I currently have a large database in SQLite that I was using for rapid-prototyping for a software I am working on. Now that I am planning to move it to another database that should give better ...
1
vote
0answers
80 views

Creating Pandas DataFrame on Python From a MongoDB Document containing Embedded documents

I am working on a machine learning algorithm on python's scikit.learn, but this time the data are in Mongodb documents format. I would like to pull my data into a dataframe. Here is an exemple of the ...
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0answers
11 views

Does the consistency part of the CAP theorem apply to updates and not first-time writes?

Using this definition of the CAP theorem: Consistency All database clients see the same data, even with concurrent updates. Availability All database clients are able to access some version ...
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0answers
29 views

What is the graveyard compaction in cassandra?

Cassandra noob here. While going through the documentation etc, I'm repetitevely finding references to graveyard compaction (and occasionally tombstones), example: $ cassandra-cli [default@unknown] ...
6
votes
2answers
777 views

What fillfactor for caching table?

I have heavily updated / accessed table where I store serialized java objects. They are in the table for 2-3 hours (also are being updated during that period) and then removed. Size of table is around ...
0
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1answer
50 views

redis newbie - how to create hash within a hash?

I want to create this type of a structure in redis: (its basically json data) { "id": "0001", "name":"widget ABC", "model": "model123", "service":"standard", "admin_password": ...
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0answers
19 views

write data on multiple storageNodes in oracle NoSQL

I'm using oracle NoSQL on ubuntu (newbie to both) and created 3 storageNodes (with 3 RN on each) in one computer on different ports (5000,6000 and 7000) in a store named mystore. Now I need to write 1 ...
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vote
1answer
66 views

How do relations work in NOSQL? [closed]

I was using SQL in all my previous application and to understand the Parse.com db storage, I wanted to know NOSQL. I tried searching the differences between SQL and NOSQL for past 2 days & I ...
0
votes
1answer
48 views

Strategies to import big data into oracle

Which strategies are available to import very larg amount of data from an external system which is delivering about 500 million small transactions every day? Oracle becomes very slow with high ...
1
vote
1answer
61 views

PostgreSQL JSON data type used as NOSQL, But VIEW as Relational Data Structure

Could I create a VIEW from the JSON data type but have it as a relational structure? Example: SELECT * FROM json_test; Results [ { "name": "Roy", "Country": "USA", ...
1
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0answers
53 views

Can we query Accumulo data from Apache Drill

Accumulo uses HDFS where as HBase also works on top of HDFS. We can query HBase data through Drill. So can we query Accumulo data also from Apache Drill ?
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0answers
8 views

Need a persistent, glorified array / bucket storage solution

I'm looking to create a system that logs information ( think, lots of writes, and a few reads ) in order of entry within a key/value datastore. The order precision is absolutely necessary above ...
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0answers
83 views

Are there any known benchmarks/statistics on UnQLite?

I came across UnQLite the other day in Stack Overflow and it has me intrigued for some software I'm working on. However, very few tests have been published on how well it performs. There are plenty of ...
0
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1answer
64 views

Uber-wide tables: Time to switch to Mongo?

As a web developer, I've typically only worked with nice, normalized tables in SQL-based RDBMS, but I'm doing some data consolidation for a researcher who will be analyzing correlations between all ...
2
votes
2answers
353 views

Can anyone offer an opinion on handlersocket vs memcached performance in MySQL 5.6

I must say I was a little mis(un)-informed about the MySQL Memcached plugin which offers the same NoSQL like access to InnoDB tables as HandlerSocket, I had only had experience with entirely ...
0
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1answer
100 views

SQL Server vs SOLR (Or any document db)

I have my "customer" data in a normalized sql server database. Getting out the customer data in my app is taking too long. This is because I have to go to 10+ tables to get all the data I need. My ...
0
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1answer
34 views

How Wide-columns databases achieve dynamic columns on the storage layout? [closed]

As known, in relational databases, when adding a new column, data must be reallocated (http://stackoverflow.com/questions/463677/alter-table-without-locking-the-table) to maintain a single row ...
0
votes
1answer
49 views

Query MongoDB collection and find rows from 7 days ago

I have a MongoDB collection called messages and this is an example document for that collection: { "_id": { "$oid": "551943eee4c6acf40fe5a0f2" }, "sender_id": { "$oid": ...
1
vote
2answers
59 views

ElasticSearch: is this problem suitable for ElasticSearch DB? [closed]

I have some hardware instruments each one recording a signal and generating sequences of timestamp/value pairs. Timestamp is a basic UTC posix time and value is a double. I'd like to record such ...
0
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1answer
68 views

NoSQL DBs and 2-way synchronization

I've been told that MongoDb does not, but do any NoSQL DBs support this functionality?
0
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1answer
146 views

View collation are incomplete joins in couchdb

I was trying to create view collations following this tutorial: http://elegantcode.com/2012/02/14/view-collation-in-couchdb/ but I realize that the result was an array with 5 elements with 2 objects ...
0
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0answers
31 views

How to create and select entities in MongoDB?

I'm a newbie in MongoDB and I'm trying to understand how to create objects there and how to select them in comparison with relational databases. So I need an example how to perform these things. ...
0
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0answers
27 views

Metadata database on top of flat files

I have a bunch (millions) of flat files. I do sort them into subdirectories, but that doesn't really help searches. Is there some database software that could be fed metadata information and would ...
3
votes
2answers
697 views

noSQL ACID and consistency for banking

We are building a real time banking platform and app. Our prime concern is safety and consistency of our data across multiple db servers. We need transactions and we can't afford to risk power ...
1
vote
0answers
35 views

Mongodb schema design validation

I am building an app which allows users to do some "tasks" to earn points. The "tasks" are part of a "campaign" which themselves are a part of "brands". I am confused about the schema for storing the ...
0
votes
0answers
17 views

Is there a Document based nosql with deep json update?

I'm currently looking in a Document based nosql (possibly with sharding/replication/NSPOF) database that allow (is specialized in) deep json document update. By that I mean that I would like a nosql ...
1
vote
0answers
47 views

Good way to store daily train data in MongoDB

I am preparing to collect large amounts of information about trains in my country. Each train in my country has a number. I've already collected all of these numbers. There are about 4000 of them. ...
0
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1answer
53 views

About schema design of NoSQL DB.(How to query multiple data?)

I just got a requirement, to build a web only with Redis. Data of the web is something like this(I write as RDBMS): User Info: user_id,first_name,last_name,age,..... Address: ...
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votes
1answer
78 views

Database migration for Large Data Set from MySQL to NoSQL

I have an existing APP that has N types of products that is normalized with MySQL. Each types of products have over 500K skus, and one of them are in the in 2M currently. We are currently tracking on ...