Running ArangoDB on a Mac with Docker and Kitematic / Docker-Machine

00Documentation

When I work with ArangoDB on my Mac, I usually install ArangoDB via homebrew and do tests on the latest new developments based on the devel-branch, compiling ArangoDB right from source.

To test a feature in a special version I use docker images that need a virtual machine on MacOS. I struggled with Boot2Docker several times and recently tried Docker Machine – with the Web UI Kitematic – currently in beta. Read more

Using Multiple Indexes Per Collection

03Documentation, Performance

The query optimizer in ArangoDB 2.8 has been improved in terms of how it can make use of indexes. In previous versions of ArangoDB, the query optimizer could use only one index per collection used in an AQL query. When using a logical OR in a FILTER condition, the optimizer did not use any index for the collection in order to ensure the result is still correct.

This is much better in 2.8. Now the query optimizer can use multiple indexes on the same collection for FILTER conditions that are combined with a logical OR. Read more

Foxx: Module resolution will change in 2.8

03Documentation, Foxx

The implementation of the JavaScript require function will be adjusted to improve compatibility with npm modules. The current implementation in 2.7 and earlier versions of ArangoDB strictly adheres to the CommonJS module standard, which deviates from the behaviour implemented in Node and browser bundlers.

Module paths will now be resolved in the following ways: Read more

Running V8 isolates in a multi-threaded ArangoDB database

00API, Architecture, C++, Documentation, nodejs

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

Dockerizing a Bloom-based Nonces Service in 10 Minutes

00Documentation, Foxx

In this article I want to explain how to setup a nonce-microservice using docker.

Nonce are one-time tokens that are used to ensure that an action can only be taken once. In a project, we needed to ensure that a pay button is only pressed once. Note that nonces are not used to sign requests or identify a user. This is a separate mechanism.

ArangoDB contains a nonce implementation which is a variation of Bloom-filters. It allows to store nearly unlimited nonces within a limited amount of memory. Nonce are allowed to age, that is after an hour they might expire. If there is sufficient interest, I will explain the algorithm implemented in a separate blog post.

More info

Create an ArangoDB cluster on Microsoft Azure

02Documentation

During the last weeks we’ve released our new deployment tool for cloud computing platforms with how-to’s for Google Compute Engine, Digital Ocean and Amazon Web Services support.

Today we show how to deploy an ArangoDB cluster on Azure with a single command.

Azure

To easy-deploy an ArangoDB cluster on Azure you just need to install the official azure-cli, download a single bash script and watch the tool take care of the rest for you. Your azure account needs permission for creating instances, adding ssh-keypairs and managing virtual networks.

More info

ArangoDB 2.6 – API changes, additions and changed behavior

00API, Documentation, Releases

ArangoDB 2.6 comes with new and changed APIs as well as changed behavior regarding document keys and several graph functions.

If you use Travis-CI for your tests you can download the Travis-CI ArangoDB build here: Travis-CI/ArangoDB-2.6.0-alpha2.tar.gz

The changes so far:

APIs added

  • added batch document removal and lookup APIs:

    These APIs can be used to perform multi-document lookup and removal operations efficiently. The arguments to these APIs are the name of the collection plus the array of document keys to fetch or remove.

    The endpoints for these APIs are as follows:

    Example call to fetch documents:

    The documents will be returned in an attribute documents of the HTTP response. documents is an array containing all documents found. Only those documents that were actually found will be returned. Documents that were searched but do not exist will not be returned and do not trigger any errors. More info

Web Interface supports AQL Query Explain

00Documentation

For developers that use the ArangoDB shell arangosh the explain() command and its compact output format is a great resource to check AQL queries. Explain prints the original query, the generated query execution plan, the applied optimizer rules plus the list of indexes that will be used. Jan showed in a blog post how this can look like.

While preparing ArangoDB 2.6 we found some time to add this feature to the Web UI. So now you can check you AQL queries right in the Web-Interface as well. More info

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