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Production Postmortem: The Spawn of Denial of Service

Production Postmortem: The Spawn of Denial of Service

December 12, 2023

A customer contacted us to complain about a highly unstable cluster in their production system. The metrics didn’t support the situation, however. There was no excess load on the cluster in terms of CPU and memory, but there were a lot of network issues. The cluster got to the point where it would just flat-out be unable to connect from one node…

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.NET Rocks: Data Sharding with Oren Eini

.NET Rocks: Data Sharding with Oren Eini

October 19, 2023

You can listen to me talk to Carl & Richard on RavenDB Sharding here. What is data sharding, and why do you need it? Carl and Richard talk to Oren Eini about his latest work on RavenDB, including the new data sharding feature. Oren talks about the power of sharding a database across multiple servers to improve performance on massive data sets.…

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RavenDB version 6.0 is now live

RavenDB version 6.0 is now live

October 2, 2023

Today marks a very long journey for RavenDB as we release version 6.0 into the wild. This completes a multi-year effort on our part, which I’m really excited to share with you. In version 6.0 the RavenDB team had a number of goals, with the primary one being, as always, providing a simple and powerful platform for your data and documents. The full…

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Optimizing a three-way merge

Optimizing a three-way merge

September 4, 2023

Deep inside of the Corax indexing engine inside of RavenDB there is the notion of a posting list. A posting list is just an ordered set of entry ids that contains a particular term. During the indexing process, we need to add and remove items from that posting list. This ends up being something like this: For fun, go and ask ChatGPT to write…

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Not all O(1) operations are considered equal

Not all O(1) operations are considered equal

August 30, 2023

At some point in any performance optimization sprint, you are going to run into a super annoying problem: The dictionary. The reasoning is quite simple. One of the most powerful optimization techniques is to use a cache, which is usually implemented as a dictionary. Today’s tale is about a dictionary, but surprisingly enough, not about a…

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Using RavenDB from Cloudflare Workers

Using RavenDB from Cloudflare Workers

August 29, 2023

RavenDB is a multi-primary database, which means that it allows you to write to multiple nodes at the same time, without needing synchronization between them. This ability to run independently from the other nodes in the cluster (or even across clusters) makes RavenDB highly suitable for running on the edge. We have recently published…

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Recording: RavenDB and High Performance with Oren Eini

Recording: RavenDB and High Performance with Oren Eini

August 28, 2023

I spoke for over an hour about how you can build high-performance systems and how we utilize these techniques inside of…

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A twisted tale of memory optimization

A twisted tale of memory optimization

August 24, 2023

I was looking into reducing the allocation in a particular part of our code, and I ran into what was basically the following code (boiled down to the essentials): As you can see, this does a lot of allocations. The actual method in question was a pretty good size, and all those operations happened in different locations and weren’t as…

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Unhandled Exception Episode 55: RavenDB and Database Internals – with Oren Eini

Unhandled Exception Episode 55: RavenDB and Database Internals – with Oren Eini

August 15, 2023

You can listen to me talk with Dan in the Unhandled Exception podcast, where we dug deep into the internals of database engines. As usual, I would love your…