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Modeling Relationships and Hierarchies in a Document Database

August 8, 2022

RavenDB CEO Oren Eini shows how best to model relationships and hierarchies in a document database, covering complex scenarios like scheduling, bank transactions, payroll, and more.

Blog

Production postmortem: The allocating query

August 5, 2022

A customer was experiencing large memory spikes in some cases, and we were looking into the allocation patterns of some of the queries that were involved. One of the things that popped up was a query that allocated just under 30GB of managed memory during its processing. Let me repeat that, because it bears repeating. That query allocated 30(!)…

Press Releases

RavenDB Announces the Release of Version 5.4, Including Integration Features for Kafka and RabbitMQ

August 1, 2022

Hadera, Israel -August 1, 2022 – RavenDB, the NoSQL Document Database used by Fortune 500 companies around the world, today announces a significant update to their software with the release of version 5.4. New Capabilities RavenDB can now seamlessly integrate with existing ecosystems, pushing events into Kafka topics, and talking to the…

Blog

Webinar Recording: RavenDB & Messaging Transactions

July 26, 2022

In RavenDB 5.4, we’re introducing new ELT features for Kafka and RabbitMQ. Now, instead of your documents just sitting there in your database, you can involve them in your messaging transactions. In this webinar, RavenDB CEO Oren Eini explains how these ETL tasks open up a whole new world of architectural patterns, and how they spare you from a…

Blog

Recording: Build your own database at Cloud Lunch & Learn

July 25, 2022

I spoke at Cloud Lunch & Learn about the basics of building a database from scratch. We took a storage engine and created a simple database within the span of an hour. Covered in the talk are the details of how you can build the database, using indexes to speed up queries and the manner in which a database interacts with its storage engine. I…

Blog

Production postmortem: Efficiency all the way to Out of Memory error

July 22, 2022

RavenDB is written in C#, and as such, uses managed memory. As a database, however, we need granular control of our memory, so we also do manual memory management. One of the key optimizations that we utilize to reduce the amount of overhead we have on managing our memory is using an arena allocator. That is a piece of memory that we allocate in…

Blog

Benchmarking: Slow is fast, fast is slow

July 21, 2022

I’m trying to compare indexing speed of Corax vs. Lucene. Here is an interesting result: We have two copies of the same index, running in parallel on the same data. And we can clearly see that Lucene is faster. Not by a lot, but enough to warrant investigation. Here is the core of the work for Lucene: And here it is for Corax: If you look at…

Blog

When debugging, assume an unreliable narrator

July 20, 2022

When we are handling a support call, we are often working with partial information about the state of the software at the customer site. Sometimes that is an unavoidable part of the job. When troubleshooting a system with patients’ records, I can’t just ask the customer to schlep the data to my laptop so I can analyze it properly. Even if we could…

Blog

High performance .NET: Building a Redis Clone–Analysis II

July 19, 2022

I’m going to go back a few steps and try to see where I should be looking at next, to see where I should pay the most attention. So far in this series, I mostly focused on how we read and process the data. But I think that we ought to take a step or two back and see where we are at in general. I ran the version with Pipelines and string usage in…