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Production postmortem: The missed indexing reference

September 15, 2022

RavenDB has a really nice feature, it allows you to index data from related documents. Consider the following document structure: We have tickets, vehicles, and users, and we want to issue a search on all the tickets issued to Joe. Leaving aside whether this is the proper way to handle this, here is what the index would look like: What we are…

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The subtleties of proper B+Tree implementation

September 14, 2022

I mentioned earlier that B+Trees are a gnarly beast to implement properly. On the face of it, this is a really strange statement, because they are a pretty simple data structure. What is so complex about the implementation? You have a fixed size page, you add to it until it is full, then you split the page, and you are done. What’s the…

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Reducing complexity with a shift in thinking

September 12, 2022

I love B+Trees, but they can be gnarly beasts, with the number of edge cases that you can run into. Today’s story is about a known difficult place, page splitting in the tree. Consider the following B+Tree, showing a three-level tree with 3 elements on each page. Consider what will happen when we want to insert a new value to the tree, the value:…

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Monitoring I/O inside of RavenDB

September 7, 2022

Earlier this year I talked about the reasoning behind the RavenDB team spending so much time building self monitoring diagnostics. Today I’m happy to announce that RavenDB has another such feature, allowing you to see, in real time, exactly what is going on in your database in terms of I/O. You can see what this looks like in this image, RavenDB…

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Comparing SQLite WAL mode to Voron’s

September 6, 2022

There is a great article discussing how SQLite is handling transactions at fly.io. Which led me to the great documentation on the WAL mode for SQLite. And that led me to think about the differences between how SQLite does it and how Voron does it. Both SQLite and Voron share asame behavior, they use Copy on Write and make the modifications for the…

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RavenDB PHP Client beta is out

September 5, 2022

The official RavenDB Client for PHP is now out in beta. You can now make use of a rich client to consume RavenDB with all the usual features you would expect. To start using RavenDB, run: $ composer require ravendb/ravendb-php-client And then you can start using RavenDB in your project. Here are some interesting code samples. Setting up a…

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Using RavenDB for Department of Defense projects

September 2, 2022

If you are using RavenDB for defense projects, we have got good news for you. RavenDB is now available on Iron Bank, making it that much easier to make use of RavenDB in defense or high security projects. Iron Bank is the DoD repository of digitally signed, binary container images including both Free and Open-Source software (FOSS) and Commercial…

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Optimizing Corax: Optimizing tree operations

August 30, 2022

I love trees. Not the ones that produce oxygen, I mean, I guess they are nice too, but I’m talking about trees in software. To be rather more exact, I’m fascinated by B+Trees and all their permutations. In a very real sense, most databases are all about B+Trees. To give you some context, Voron alone, at this time, has the following: Tree – the…

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RavenDB 5.4 is out

August 29, 2022

That actually happened over a month ago, but I’m afraid that July / August hasn’t been kind of either my attention span or the ability to actually keep track of what is happening. September is around the corner (at which point the summer vacation would be over and I’m already looking forward to some blessed routine). The 5.4 release is a Long Term…