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Mikio Braun06/29/12
3274 views
0 replies

Is Machine Learning Losing Its Impact?

A recent paper written by Kiri Wagstaff claims that that machine learning might be in danger of losing its impact because the community as a whole has become quite self-referential.

Bozhidar Bozhanov06/28/12
7805 views
4 replies

From 2010: Why Startups Should Not Choose NoSQL

The NoSQL hype is omnipresent. And many startups are tempted to go for Cassandra/MongoDB/HBase/Redis/… . Here I’ll argue why they should rather stick to a SQL solution – MySQL or PostgreSQL.

Ayende Rahien06/28/12
1722 views
0 replies

Dinner Party Gets Ported to RavenDB on RavenHQ

I got word about a port of Nerd Dinner to RavenDB, Dinner Party (source, live demo), and I just had to check the code.

Paul Hammant06/28/12
1784 views
0 replies

My Opinion: The Document is the Single Source of Truth

An interesting discussion in response to a recent blogger claiming that the model is the single source of truth.

Eric Genesky06/27/12
3689 views
0 replies

Video: MongoDB and the JVM

Brendan W. McAdams presents the following presentation (approx. 1 hour) on bringing together MongoDB, a popular NoSQL database, with the Java Virtual Machine.

Brian O' Neill06/27/12
1985 views
0 replies

Using Cassandra's Indexing Capabilities for JSON

Cassandra has native indexing capabilities, but those capabilities only work if the values stored in your columns are the values you want indexed.

Mark Needham06/26/12
2525 views
0 replies

How to Find the Most Connected Neo4j Node Using Cypher

An attempt to use Neo4j to figure out which people within the graph have worked with the most co-workers

Ayende Rahien06/26/12
2300 views
0 replies

How to Implement RavenDB Indexes

I got a couple of interesting questions about RavenDB implementation, and I thought it would make a good blog post.

Steve Francia06/26/12
4576 views
0 replies

MongoDB: Replication, Durability, and Disaster Recovery

This session introduces the basic components of high availability before going into a deep dive on MongoDB replication.

Michael Mainguy06/25/12
2142 views
0 replies

Using a User Type to Fix Hibernate, DB2, Derby, and Boolean

After googling a problem with boolean type fields, this team realized that the solution involved creating a custom user type.

Mark Needham06/25/12
2613 views
0 replies

How Does Neo4j Handle Optional Relationships?

An illustrated discussion of how Neo4j handles optional relationships with code included.

Mike Stonebraker06/25/12
3218 views
0 replies

To Flash or Not to Flash: That is the Question

From Dr. Mike Stonebraker over at VoltDB comes a discussion of the future of flash memory.

Santosh Kumar06/24/12
2617 views
0 replies

A Couple Redis Gotchas with a Focus on Concurrency

A lot of the caution that needs to be taken while working in a shared memory system also applis to a situation where redis is operating in a concurrent/distributed environment.

Micheal Shallop06/23/12
3578 views
0 replies

MongoCursorException: E11000 Duplicate Key Error Index

The problem: I’m working on a project where I’m taking a csv file that contains a little more than 100 columns of data by 10,000 rows. . . but when I turn-on processing for the other 9,999 rows, all I get stored into mongo is the first row of data.

James Sugrue06/22/12
3751 views
0 replies

Seven Databases in Song

It's Friday, so why not take 2 minutes out of your day for this fun song, with the added advantage of learning about seven of the most popular databases available. Be warned though, it's pretty catchy!

Santosh Kumar06/22/12
2503 views
0 replies

How to Build an RSS Feed Processor Using Redis

I am going to use Redis' atomic and blocking facilities to build a multi-step RSS feed processor. Along the way, some of the topics I hope to touch upon are: queue priorization, synchronization between processes, using redis to gracefully . . .

Ayende Rahien06/21/12
1433 views
0 replies

More on Geo Location and Spacial Searches with RavenDB: Importing Data

Continuing a previous post on geospatial indexing with RavenDB, Ayende shows how to upload the MaxMind data into RavenDB.

Shelan Perera06/20/12
4567 views
0 replies

Making Things Easier with Cassandra GUI 2.0

New features include: complete pagination for row view of explorer and filtering non-displayable data.

Ayende Rahien06/20/12
2099 views
0 replies

Geo Location, Spatial Searches, and RavenDB

The code in this post allows us to query things efficiently and easily. But before we can get there, we need to actually load the data in . . .

Ben Kepes06/20/12
3406 views
0 replies

Weighing the Pros and Cons of NoSQL on the Cloud

This article weighs the pros and cons of NoSQL adoption by the likes of Facebook, Twitter, and Digg.

Eric Genesky06/20/12
2625 views
0 replies

Help the Neo4j Team Testing the Cypher-JDBC-Driver

Rickard Öberg did a lab project last December developing a first prototype of a JDBC driver that connects to the Neo4j Server Cypher endpoint.

Kristina Chodorow06/19/12
4301 views
0 replies

Time-to-Live Collections with MongoDB

Kristina Chodorow presents another great post on MongoDB; this time with a Princess Bride theme.

Max De Marzi06/19/12
1759 views
0 replies

Bringing Personalization to Your Apps Using Cypher

When we are looking at an unregistered user (somebody just browsing the site) using the Item based recommendation we already built is all we have to go on.

Rick Copeland06/19/12
4564 views
0 replies

Get to Know GridFS: The MongoDB Filesystem

A great intro to GridFS, a convention and API (not something native to your server), and how you can use it from Python

Kathiravelu Pra...06/18/12
1717 views
0 replies

Issues Migrating Cassandra Using DataStax / Sqoop

If you fail to indicate the primary key to sqoop, the following exception will be thrown; a similar issue arises without properly starting Cassandra.