---
title: ArangoDB Blog | Frank Celler (14)
description: Frank is both entrepreneur and backend developer, developing mostly memory databases for two decades. He is the CTO and co-founder of ArangoDB. Try to challenge Frank asking him questions on C, C++ and MRuby. Besides Frank organizes Cologne’s NoSQL group & is an active member of NoSQL community. (14)
---

ArangoDB 3.12 Product Release Announcement! Read the blog for details. [Read Blog](https://arangodb.com/2024/03/arangodb-3-12-performance-for-all-your-data-models/)

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- Why Graph 
    - [The Rise of Graph](https://arangodb.com/the-rise-of-graph/)
    - [The Graph ML Gamechanger](https://arangodb.com/the-graph-ml-gamechanger/)
    - [Consolidate to Graph](https://arangodb.com/graph-vs-relational/)
    - [Graph DB Basics](https://arangodb.com/graph-database/)
- Products 
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    - [Self-Managed Graph DB](https://arangodb.com/arangograph-selfmanaged/)
    - [Managed Graph ML](https://arangodb.com/managed-ml-graph/)
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    - [Compare Products](https://arangodb.com/subscriptions/)
- Solutions 
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          - [Cyber/Threat Mgmt](https://arangodb.com/solutions/use-cases/cyber-threat-management/)
          - [Fraud Detection](https://arangodb.com/solutions/use-cases/fraud-detections/)
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          - [Aerospace & Defence](https://arangodb.com/arangodb-for-aerospace-defense/)
          - [Manufacturing](https://arangodb.com/arangodb-for-manufacturing/)
    - Solution Accelerators 
          - [Enterprise Knowledge Graphs](https://arangodb.com/resources/white-papers/enterprise-knowledge-graphs/)
          - [Entity Resolution](https://arangodb.com/entity-resolution/)
          - [Traceability/Lineage](https://arangodb.com/traceability-and-lineage/)
          - [Contexual Relevance](https://arangodb.com/contextual-relevance/)
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![Vector-5](https://blog.arangodb.com/hubfs/Imported_Blog_Media/search.svg)

## [Meet us at Nosql matters, Berlin Buzzwords or EuRuKo](https://blog.arangodb.com/blog/2012/05/meet-us-at-nosql-matters-berlin-buzzwords-or-euruko)

 May 21, 2012

 Tags: [Community](https://blog.arangodb.com/blog/topic/community), [Ruby](https://blog.arangodb.com/blog/topic/ruby)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 0 minutes

Just a quick note: We are on the road… you can meet us in person at the following conferences:

[(more…)](https://blog.arangodb.com/blog/2012/05/meet-us-at-nosql-matters-berlin-buzzwords-or-euruko)

## [JSON Parser for MRuby or how to define classes and exceptions in C](https://blog.arangodb.com/blog/2012/05/json-parser-for-mruby-or-how-to-define-classes-and-exceptions-in-c)

 May 20, 2012

 Tags: [Ruby](https://blog.arangodb.com/blog/topic/ruby)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 3 minutes

MRuby is progressing quite rapidly, it is now possible to implement a real REPL, see [github](https://github.com/mruby/mruby/issues/32). So, it is time to continue my efforts to integrate MRuby into ArangoDB. ArangoDB currently uses JavaScript to implement transactions and enrich the database with small Actionlets, i. e. functions that take a HTTP request and produce a HTTP response. Additionally, there is a shell, which allows you to administrate the server.

I want to be able to also use MRuby for these jobs. These easiest part is the interactive shell. It requires the following components:

[(more…)](https://blog.arangodb.com/blog/2012/05/json-parser-for-mruby-or-how-to-define-classes-and-exceptions-in-c)

## [“AvocadoDB” becomes “ArangoDB”](https://blog.arangodb.com/blog/2012/05/avocadodb-become-arangodb)

 May 09, 2012

 Tags: [Community](https://blog.arangodb.com/blog/topic/community), [General](https://blog.arangodb.com/blog/topic/general)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 0 minutes

Hi folks,

to avoid legal issues with some other Avocado lovers we have to change the name of our database. We want to stick to Avocados and selected a variety from Mexico/Guatemala called “Arango”.

[(more…)](https://blog.arangodb.com/blog/2012/05/avocadodb-become-arangodb)

## [Talk: Using mruby with ArangoDB (@Cologne Ruby User Group)](https://blog.arangodb.com/blog/2012/04/talk-using-mruby-with-avocadodb)

 April 27, 2012

 Tags: [Community](https://blog.arangodb.com/blog/topic/community), [Application Server](https://blog.arangodb.com/blog/topic/application-server), [Ruby](https://blog.arangodb.com/blog/topic/ruby)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 1 minutes

Frank has given a short lightning talk on using mruby in ArangoDB (at this time still called AvocadoDB) at the [Cologne Ruby](http://www.colognerb.de)user group.

[(more…)](https://blog.arangodb.com/blog/2012/04/talk-using-mruby-with-avocadodb)

## [Preliminary Performance Tests for mruby and V8](https://blog.arangodb.com/blog/2012/04/preliminary-performance-tests-for-mruby-and-v8)

 April 25, 2012

 Tags: [Performance](https://blog.arangodb.com/blog/topic/performance)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 3 minutes

Note: We changed the name of the database in May 2012. AvocadoDB is now called ArangoDB

I’m still investigating the possibility to use mruby as embedded language for AvocadoDB, see me last [post](https://blog.arangodb.com/blog/2012/04/using-mruby-as-alternative-to-server-side-javascript). I managed to create an interactive [shell](https://blog.arangodb.com/blog/2012/04/towards-an-interactive-mruby-shell) to play with mruby. Now am trying to do some performance tests. Note that mruby is still “alpha”, so DO NOT take these test to seriously. They are basically just for me to learn, how to use mruby.

### Exposing a C function to MRUBY

The first function I need is a timing function. I’ve implemented such a function in C using `gettimeofday`. Now in order to make it..

[(more…)](https://blog.arangodb.com/blog/2012/04/preliminary-performance-tests-for-mruby-and-v8)

## [Towards an interactive mruby shell](https://blog.arangodb.com/blog/2012/04/towards-an-interactive-mruby-shell)

 April 22, 2012

 Tags: [Ruby](https://blog.arangodb.com/blog/topic/ruby)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 2 minutes

In my [last post](https://blog.arangodb.com/blog/2012/04/using-mruby-as-alternative-to-server-side-javascript) I investigated the possibility of using mruby as embedded language for AvocadoDB. As the first results look quite promising I decided to write a small interactive mruby shell. There is no better way to explore a new toy than to play with it.(Un)fortunately “irb” from Ruby is written in Ruby itself, so one cannot just use it for mruby. So, instead I had to write a small C++ program using “readline” and the compile/execute functions from mruby. In order to implement a Read-Eval-Print-Loop, well, one needs the print. That in itself is more complicated than expected, see the [..](https://github.com/mruby/mruby/issues/32)

[(more…)](https://blog.arangodb.com/blog/2012/04/towards-an-interactive-mruby-shell)

## [Using Minimalistic Ruby as alternative to server-side JavaScript](https://blog.arangodb.com/blog/2012/04/using-mruby-as-alternative-to-server-side-javascript)

 April 20, 2012

 Tags: [Ruby](https://blog.arangodb.com/blog/topic/ruby), [Javascript](https://blog.arangodb.com/blog/topic/javascript), [General](https://blog.arangodb.com/blog/topic/general)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 5 minutes

Note: We changed the name of the database in May 2012. AvocadoDB is now called ArangoDB.

### Introduction

One of the design goals of AvocadoDB is:

Use AvocadoDB as an application server and fuse your application and database together for maximal throughput

In order to act as application server, AvocadoDB has a build in language, currently JavaScript. As **mruby** became publically available a few hours ago, I started to see if can be viable alternative. This blog post summarizes my finding.

### Status Quo

AvocadoDB acts as HTTP server. Each request is parsed, routed, and passed to a small piece of..

[(more…)](https://blog.arangodb.com/blog/2012/04/using-mruby-as-alternative-to-server-side-javascript)

## [Tutorial for ArangoDB’s PHP API published](https://blog.arangodb.com/blog/2012/04/tutorial-for-avocadodb-php-api-published)

 April 16, 2012

 Tags: [General](https://blog.arangodb.com/blog/topic/general), [Tutorial](https://blog.arangodb.com/blog/topic/tutorial)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 0 minutes

Note: We changed the name of the database in May 2012. AvocadoDB is now called ArangoDB.

[(more…)](https://blog.arangodb.com/blog/2012/04/tutorial-for-avocadodb-php-api-published)

## [martin on skip list indices and why we use them in ArangoDB](https://blog.arangodb.com/blog/2012/04/skip-list-indices-in-avocadodb)

 April 03, 2012

 Tags: [Architecture](https://blog.arangodb.com/blog/topic/architecture)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 1 minutes

Note: We changed the name of the database in May 2012. AvocadoDB is now called ArangoDB.

Last week AvocadoDB got mentioned in “nosql weekly” and the project achieved a huge amount of public interest especially from Japan. Awesome! 🙂

In this context Mr. Fiber [asked](https://twitter.com/#!/repeatedly/status/185799292911497218) on twitter what the use of skip list indices in AvocadoDB is. Here’s a short video reply by chief architect martin Schoenert. Got an opinion on this? – we’d love to hear your thoughts on this in the comments.

[(more…)](https://blog.arangodb.com/blog/2012/04/skip-list-indices-in-avocadodb)

## [Using Hilbert curves and Polyhedrons for Geo-Indexing](https://blog.arangodb.com/blog/2012/03/using-hilbert-curves-and-polyhedrons-for-geo-indexing)

 March 31, 2012

 Tags: [geo](https://blog.arangodb.com/blog/topic/geo), [General](https://blog.arangodb.com/blog/topic/general)

![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 0 minutes

Cambridge mathematician Richard R. Parker presents a novel algorithm he has developed using a Hilbert curve and Polyhedrons to efficiently implement geo-indexing.

[(more…)](https://blog.arangodb.com/blog/2012/03/using-hilbert-curves-and-polyhedrons-for-geo-indexing)

[«](https://blog.arangodb.com/blog/author/frank-celler/page/13) [1](https://blog.arangodb.com/blog/author/frank-celler/page/1) [...](https://blog.arangodb.com/blog/author/frank-celler/page/9)

[11](https://blog.arangodb.com/blog/author/frank-celler/page/11) [12](https://blog.arangodb.com/blog/author/frank-celler/page/12) [13](https://blog.arangodb.com/blog/author/frank-celler/page/13) [14](https://blog.arangodb.com/blog/author/frank-celler/page/14) [15](https://blog.arangodb.com/blog/author/frank-celler/page/15)

[»](https://blog.arangodb.com/blog/author/frank-celler/page/15)

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