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In Short: ACID

In Short: ACID

December 17, 2021

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Blog
Challenge: Find the slow down–answer

Challenge: Find the slow down–answer

December 16, 2021

I asked about a slow piece of code and why it is so slow. The answer is pretty simple, I messed up, take a look at this piece of code: When the Value is an int, I’m creating a span from the address of a long variable (initialized to zero). That means that I have a lot of hash collisions, which means that adding to the dictionary turned into a…

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Challenge: Find the slow down

Challenge: Find the slow down

December 15, 2021

The following code takes a long time to run. In fact, I’m writing this blog post while this is running, and I’m not sure how long that will take. Update: This took over a minute to complete on my machine (which is pretty nice). The killer is that this code is correct, it does the right thing, but it can be slow. I stripped a much larger scenario…

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Talk: Scalable architecture from the ground up

Talk: Scalable architecture from the ground up

December 14, 2021

In this talk, Oren Eini, founder of the RavenDB NoSQL database, will speak about how you can design and architect software systems that can easily scale to stupendous sizes, without causing either headache or pinching your wallet. It is obvious that if you chose the right algorithm for a particular task, you can gain tremendous benefits in terms…

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Production postmortem: The memory leak that only happened on Linux

Production postmortem: The memory leak that only happened on Linux

December 13, 2021

Our monitoring system pinged us about a problem with a RavenDB cluster running in production. The problem was simple, we saw quite a bit of server restarts for that particular cluster. Looking deeper, it was obvious that the RavenDB instances for the cluster would occasionally run out of memory and crash. The customer, by the way, was unaware of…

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Digging into the .NET Dictionary implementation…

Digging into the .NET Dictionary implementation…

December 10, 2021

I had dug into the implementation of the .NET dictionary because of this issue. More specifically, I wanted to know what kind of collision handling system is in use there. The two common ones are open addressing and chaining. The code for the Dictionary is available, but I don’t think that I read much about how it works. I found some interesting…

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re: Why IndexedDB is slow and what to use instead

re: Why IndexedDB is slow and what to use instead

December 9, 2021

I ran into this post and I thought that I would share my thinking on the matter. I don’t actually know anything about IndexedDB, but I have been working with databases for a sufficiently long time to understand what the root problem here is. The issue the post is talking about is that IndexedDB is slow, to the rate of inserting hundreds of…

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Feature Design: ETL for Queues in RavenDB

Feature Design: ETL for Queues in RavenDB

December 8, 2021

RavenDB is rarely deployed in isolation, it is typically used in existing systems and is integrated into the overall system. One of the key ways by which this is promoted is the built-in ETL support that we have. RavenDB currently has ETL for Postgres, SQL Server, Oracle, MySQL, Elastic,  OLAP / Date Lake, and other RavenDB instances. We are…

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Cumulative computation with RavenDB queries

Cumulative computation with RavenDB queries

December 7, 2021

Consider the image on the right, where we have three charges on separate months. This is a time series, showing charges over time. We can very easily issue queries that will give us the results of how much we paid in a time period, but what if we wanted to get the cumulative value. How much have I paid so far? Here is how this should look…