Blog Archives

Eventual Consistency: How Eventual? How Consistent?

In my last post on Riak, I discussed how an application developer could use the values of N (number of replication nodes), R (read quorum), and W (write quorum) to fine tune the availability, latency, and consistency trade-offs of a

Posted in Uncategorized

Exploring NoSQL: Fine Tuning CAP with Riak

In previous posts, I explored MongoDB and Redis. MongoDB, a document-oriented database, allows developers to work with JSON documents in interesting ways. Redis offers developers a set of fundamental data structures upon which to build applications. Riak, in contrast, offers

Posted in NoSQL, Riak

MongoDB Aggregation Framework: The SQL of NoSQL

No, it’s not really SQL. Its syntax resembles JSON. It returns a collection of JSON documents. But the Aggregation Framework addresses for MongoDB what many have found lacking in non-relational databases, the capability for ad hoc queries that SQL performs

Posted in MongoDB, NoSQL

Exploring NoSQL: Redis

Redis differs so dramatically from traditional databases that you’d be forgiven for not recognizing the family resemblance. Indeed, it’s possible to run Redis as a key-value memory cache, mimicking the functionality of Memcached, which itself is not a database. Like

Posted in NoSQL, Redis

Exploring NoSQL: Memcached

Memcached might seem an odd place to venture in an exploration of NoSQL databases. It is not a database. It provides no persistence. It purges items from memory to free space as needed. And there is no replication. If data

Posted in NoSQL

Harmonic: A MongoDB Success Story

After writing my last post on MongoDB, I attended a meet-up at the Mozilla office in San Francisco to hear the tale of a real company in the process of migrating from Microsoft SQL Server to MongoDB. The company, Harmonic,

Posted in MongoDB, NoSQL, Workflow

Exploring NoSQL: MongoDB

MongoDB is one of the most popular of open source NoSQL databases. Supported by 10gen and boasting a long list of deployments including Disney, Craigslist, and SAP, MongoDB has a remarkably simple application programming interface (API) and all the tools

Posted in MongoDB, NoSQL