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Proper software architecture for a new project

January 1, 2020

I got an email recently asking about my advice on how to approach the architecture on new projects. In particular, looking at typical architectural patterns, they are full of things like repositories, interfaces, components and multiple moving pieces. Usually they are marketed as items that will aid future extensibility or promote separation of…

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Feature discussion: Spicing up document refreshes in RavenDB

December 31, 2019

I posted about the @refresh feature in RavenDB, explaining why it is useful and how it can work. Now, I want to discuss a possible extension to this feature. It might be easier to show than to explain, so let’s take a look at the following document: The idea is that in addition to the data inside the document, we also specify behaviors that will…

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Refreshing documents in RavenDB

December 30, 2019

Once you put a document inside RavenDB, this is pretty much it, as far as RavenDB is concerned. It will keep your data safe, allow to query it, etc. But it doesn’t generally act upon it. There are a few exceptions, however. RavenDB supports the @expires metadata attribute. This attribute allows you to specify a specific time in which RavenDB will…

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re: Writing a very fast cache service with millions of entries

December 27, 2019

I run into this article that talks about building a cache service in Go to handle millions of entries. Go ahead and read the article, there is also an associated project on GitHub. I don’t get it. Rather, I don’t get the need here. The authors seem to want to have a way to store a lot of data (for a given value of lots) that is accessible over…

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re: Why databases use ordered indexes but programming uses hash tables

December 26, 2019

This post asked an interesting question, why are hash table so prevalent for in memory usage and (relatively) rare in the case of databases. There is some good points in the post, as well as in the Hacker News thread. Given that I just did a spike of persistent hash table and have been working on database engines for the past decade, I thought…

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Random benchmark for the day

December 25, 2019

One of our developers recently got a new machine, and we were excited to see what kind of performance we can get out of it. It is an AMD Ryzen 9, 12 cores @ 3.79 Ghz with 32 GB of RAM. The disk used was Samsung SSD 970 EVO Plus 500 GB. This isn’t an official benchmark, to be fair. This is us testing on how fast the machine is. As such, this is a…

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RavenDB and output collection pattern

December 24, 2019

A map/reduce index in RavenDB can be configured to output its value to a collection. This seems like a strange thing to want to do at first. We already got the results of the index, in the index. Why do we want to duplicate that by writing them to collections? As it turns out, this is a pretty cool feature, because it enable us to do quite a lot.…

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Company.Location = new OfficeSpace(); // 4th time the charm

December 23, 2019

Exactly 9 years ago, Hibernating Rhinos had a major breakthrough. We moved to our own offices for the first time. Before that, I was mostly working from a home office of clients’ locations. Well, I say we, but I mean I. At the time, the change mostly involved me having to put on some shoes and going out of the house to work alone in a big empty…

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RavenDB Cloud now running on Google Cloud

December 20, 2019

We have just rolled out GCP support for RavenDB Cloud. The support is still in the beta stage, because we like to be conservative, but you now have the ability to deploy RavenDB clusters on GCP at the click of a button. All the usual features are supported. You can provision a new cluster, RavenDB Cloud will monitor and manage it for you, and you…