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Max-Gerd Retzlaff, 2025/09/29 12:39:38 PM GMT+2

NDB interpreted code, cl-ndbapi, and the new NDB IC compiler
September 29, 2025. Max-Gerd Retzlaff, Datagraph GmbH, Berlin.

This is the first article in a series on using NDB interpreted code (IC) programs with RonDB. And how the compiler I wrote for it made the task much simpler (at least for me and probably for any other Lisp programmer), as it allows to:
- write the code with higher level constructs and
- compile not only to NDB interpreted code but also to a Lisp backend.
The last part means that a subset of the NDB interpreted code languages was also implemented in Lisp. NDB interpreted programs can also be compiled to this Lisp subset, so that new code can be tested in the Lisp image as ordinary Lisp code with full introspection instead of running it within RonDB data nodes which is quite opaque in comparison and often requires debugging crash logs instead when something goes wrong.

… Read the whole article: NDB interpreted code, cl-ndbapi, and the new NDB IC compiler
Max-Gerd Retzlaff, 2025/10/07 13:22:16 PM GMT+2

A note on RonDB and MySQL NDB Cluster, their documentation, and RonDB's history

October 07, 2025. Max-Gerd Retzlaff, Datagraph GmbH, Berlin.

This is the second article in a series on using NDB interpreted code (IC) programs with RonDB and it just tries to work out how accurate the MySQL documentation still is for its fork RonDB. A question that I had for a long time, especially when I started to use RonDB and implemented code to access it. (The first article is "NDB interpreted code, cl-ndbapi, and the new NDB IC compiler".)

… Read the whole article: A note on RonDB and MySQL NDB Cluster, their documentation, and RonDB's history
Max-Gerd Retzlaff, 2025/11/07 11:11:27 AM GMT+1

A very short NDB interpreted program:
row counts and range estimations
November 17, 2025. Max-Gerd Retzlaff, Datagraph GmbH, Berlin.

This is the third article in a series on using NDB interpreted code (IC) programs with RonDB and discusses:
- an example of a very short but still very useful interpreted code program and
- I outline how it is used in RonDB to do quick row counts of entire tables, but
- the main part is how this is adapted to be useful to improve our graph database Dydra.
This is not just a theoretical discussion but a significant improvement and actually essential for Dydra.

I explain how triples can be stored in a very simply fashion in an SQL table and I show some simple SPARQL queries and how they translate to underlying RonDB index scans. All that combined with a simple interpreted program, bounded scans and retrieval of extra values. With the older RecAttr interface as well as the newer Record interface of the NDB API.

So this article contains a lot of source code for a change. C++. SQL, SPARQL and Common Lisp.

… Read the whole article: A very short NDB interpreted program: row counts and range estimations
Max-Gerd Retzlaff, 2026/05/26 2:29:20 PM GMT+2

ELS 2026 papers to conclude the series on using NDB interpreted code

May 26, 2026. Max-Gerd Retzlaff, Datagraph GmbH, Berlin.

This is the forth article in a series on using NDB interpreted code (IC) programs with RonDB and it contains the promised closer look at the NDB IC Compiler and how our graph database Dydra uses it.

To conclude the series I decided not to write more blog posts but rather two formal research papers, which I presented at The 19th European Lisp Symposium (ELS'26), Krakow, Poland, 11-12 May 2026.

… Read the whole article: ELS 2026 papers to conclude the series on using NDB interpreted code

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Max-Gerd Retzlaff, 2025/9/22, 1:18:02 PM

Scaling Dydra with RonDB: Toward a Trillion-Triple Store

September 22, 2025, Datagraph GmbH, Berlin, and Hopsworks AB, Stockholm.

What if your database could remember everything—every edit, every state, every version—across time, while scaling effortlessly beyond the limits of a single machine?

That’s exactly the kind of challenge we’ve been tackling with Dydra, a revisioned RDF graph store, and RonDB, a high-performance, clustered database built for scale.

… Read the whole article: Scaling Dydra with RonDB: Toward a Trillion-Triple Store
Max-Gerd Retzlaff, 2025/9/19, 1:16:52 PM

cl-ndbapi for RonDB 24.10

September 19, 2025. Release announcement.

Datagraph GmbH, Berlin. – After more than a year of work, we just released a much enhanced version of cl-ndbapi, the Common Lisp bindings to the C++ NDB API of RonDB. So, welcome cl-ndbapi for RonDB 24.10!

Since the version for RonDB 22.10.1, which was released in June 2024, cl-ndbapi evolved as new features of RonDB were developed in collaboration with us, changing its API often. Therefore we decided not to release it until RonDB 24.10 was released. Now that this has happened a short time ago in August 2025, it is time to release cl-ndbapi for RonDB 24.10 as well.

As a main feature it contains a neat little compiler which allows to write NDB API interpreted programs in a simplified Lisp and push computations from the query processor into the RonDB cluster, specifically the data nodes.

… Read the whole article: cl-ndbapi for RonDB 24.10
Max-Gerd Retzlaff, 2024/7/23, 3:22:38 PM

Pushing the logic to the data – Running Dydra's revisioning algorithm within RonDB's data nodes

July 23, 2024. News release.

We are working on ways to distribute not just data storage, but also query processing. A new capability of both Dydra and RonDB allows us to push the test to the data instead of having to pull all data to the test, greatly reducing the data that has to move.

Data that used to be opaque to RonDB and had needed to be retrieved from the data nodes and interpreted by the Dydra query processor, is now analyzed by hashtag#NDB interpreted code within the RonDB cluster already.

… Read the whole article: Pushing the logic to the data – Running Dydra's revisioning algorithm within RonDB's data nodes

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NDB interpreted code, cl-ndbapi, and the new NDB IC compiler

A note on RonDB and MySQL NDB Cluster, their documentation, and RonDB's history

A very short NDB interpreted program: row counts and range estimations

ELS 2026 papers to conclude the series on using NDB interpreted code

Scaling Dydra with RonDB: Toward a Trillion-Triple Store

cl-ndbapi for RonDB 24.10

Pushing the logic to the data – Running Dydra's revisioning algorithm within RonDB's data nodes

NDB interpreted code, `cl-ndbapi`, and the new NDB IC compiler

A very short NDB interpreted program:
row counts and range estimations

`cl-ndbapi` for RonDB 24.10