Running V8 isolates in a multi-threaded ArangoDB database

00API, Architecture, C++, Documentation, nodejsTags:

ArangoDB allows running user-defined JavaScript code in the database. This can be used for more complex, stored procedures-like database operations. Additionally, ArangoDB’s Foxx framework can be used to make any database functionality available via an HTTP REST API. It’s easy to build data-centric microservices with it, using the scripting functionality for tasks like access control, data validation, sanitation etc.

We often get asked how the scripting functionality is implemented under the hood. Additionally, several people have asked how ArangoDB’s JavaScript functionality relates to node.js.

This post tries to explain that in detail.

More info

Fulltext Index Enhancements

00API, ArchitectureTags:

This post is about improvements for the fulltext index in ArangoDB 2.6. The improvements address the problem that non-string attributes were ignored when fulltext-indexing.

Effectively this prevented string values inside arrays or objects from being indexed. Though this behavior was documented, it was limited the usefulness of the fulltext index much. Several users requested the fulltext index to be able to index arrays and object attributes, too.

Finally this has been accomplished, so the fulltext index in 2.6 supports indexing arrays and objects!

Read on in Jan’s blog post about Fulltext Index Enhancements.

Agile development vs. schema enforcement – a paradox resolved

00ArchitectureTags:

The fans of modern and agile software development usually propose to use schemaless database engines to allow for greater flexibility, in particular during the early rapid prototyping phase of IT projects. The more traditionally minded insist that having a strict schema that is enforced by the persistence layer throughout the lifetime of a project is necessary to ensure quality and security.
schema_enforcement
In this post I would like to explain briefly, why I believe that both groups are completely right and why this is not so paradoxical as it sounds at first glance. More info

Building Hypermedia APIs – a Design Approach using Statecharts

00API, Architecture, FoxxTags:

This is the second blog post on building hypermedia APIs with the focus on API design. In part 1 Lucas describes the concept of links in JSON.

Imagine we have an API where people can like books and other people can then see, who likes a certain book. We want this API to be highly connected: We don’t want to look up URLs in a documentation, we want to follow links as we know it from the world wide web. All we want to do as the author of the API is give our users a single URL from which they can then follow links to all other resources. This is similar to the way we would do this with a website. Leonard Richardson and Mike Amundsen refer to this as the billboard URL for this reason: If you put this URL on some billboard, people know everything to get started with your API. More info

Modeling Data in MongoDB vs ArangoDB

05Architecture, Documentation, Graphs, Query LanguageTags: ,

MongoDB is a document DB whereas ArangoDB is a multi-model DB supporting documents, graphs and key/values within a single database. When it comes to data modeling and data querying, they pursue somewhat different approaches.


In a Nutshell: In MongoDB, data modeling is “aggregate-oriented”, avoiding relations and joins. On the other side, everybody has probably used relational databases which organize the data in tables with relations and try to avoid as much redundancy as possible. Both approaches have their pros and cons. ArangoDB is somewhat in-between: You can both model and query your data in a “relational way” but also in an “aggregate-oriented way”, depending on your use case. ArangoDB offers joins, nesting of sub-documents and multi-collection graphs. More info

FullStack London

00Architecture, Conferences, Foxx, General, nodejsTags:

I recently had the chance to visit FullStack London, a well organized conference. Thanks a lot to Skills Matter. FullStack was opened by Douglas Crockford about “The Better Parts” of ES6. I cannot wait to start using them. Douglas was followed by Isaac Schlueter talking about open source in companies. Although this talk was not technical I learned a lot and it was very inspiring.

The remainder of the conference was all about using JavaScript mostly on server-side using Node.js or in robotics. As robotics is not my kind of topic I visited the talks about server-side JS. They confirmed my impression where JS development is heading to: Microservices. More info

Disk space usage in ArangoDB

02Architecture, General, PerformanceTags: ,

In this post we’ll explain how ArangoDB stores collection data on disk and look at its storage space requirements, compared to other popular NoSQL databases such as CouchDB and MongoDB.

How ArangoDB allocates disk space

ArangoDB stores documents in collections. The collection data is persisted on disk so it does not get lost in case of a server restart.
More info