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RavenDB Cloud API and other updates

May 22, 2020

The RavenDB Cloud team has been silently working on a whole bunch of features. Many of them are backend features that as a user, you don’t really care about. But we finally got around to unveiling a lot of the stuff that is customer facing. RavenDB Cloud now has a public API so you can automate your cluster and deployments. You can go into your…

Articles

Code Project: RavenDB NoSQL Database Counters, Graph API, JavaScript Index, Clusterwide ACID

May 21, 2020

The release of RavenDB 4.2 comes with some fantastic new features that enable you to do a lot more with your NoSQL Database. RavenDB’s latest version comes with Graph Queries, Clusterwide Transactions, Distributed Counters, JavaScript Indexes, and Revert Revisions. Our new Graph Query API allows you to perform petabyte-scale aggregation.…

nosql-database

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Indexing in RavenDB Compared to MongoDB and PostgreSQL

May 21, 2020

Introduction In this article we’ll discuss how RavenDB indexes documents and how it differentiates itself from MongoDB, another NoSQL document database, as well as the relational database, PostgreSQL. When it comes to indexing, RavenDB favors “eventual consistency” which means that it optimizes for high throughput read and write scenarios…

nosql-database

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RavenDB Counters & Time series chapter is ready for review

May 20, 2020

I’ve started the work to update the Inside RavenDB book to version 5.0, covering all the new things that happened in RavenDB since the 4.0 release. I have just completed a major milestone, I finished the chapter discussing time series and counters, and I would really appreciate any comments you have to make. You can find the new chapter here, look…

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Webinar tomorrow – Event Sourcing in C# with RavenDB

May 18, 2020

I’m going to be talking about event sourcing in RavenDB tomorrow. The registration link and full details are…

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Complex data analysis with RavenDB

May 13, 2020

The task today is to do some fraud detection. We have a set of a few million records of transactions, each one of them looking like this: We want to check a new transaction against the history of data for this particular customer. The problem is that we have a very limited time frame to approve / reject a transaction. Trying to crawl through a…

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Dealing with sparse values in RavenDB timeseries

May 12, 2020

I got an interesting question while discussing timeseries, and I thought it would make for a good blog post. Consider the timeseries that we have on the right. It shows a particular sensor value over a period of time. The sensor in question reports data only when the value changes, but we want to get the data on every 30 minutes scale. How can we…

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The invisible man in the middle: An investigative story

May 8, 2020

A user reported a bug to our support. When running on MacOS, they were unable to authenticate against a remote RavenDB instance. That was strange, since we support running on MacOS, both as a client and as a server. We have had some issues around different behavior, but it is working, so what could the issue be? RavenDB uses X509 certificates for…

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Avoid rolling your own leader election algorithm

May 7, 2020

Jeremy Miller has an interesting blog post about using advisory locks in Postgres to handle leader elections. This is a topic I spend a lot of time on, so I went over the post in detail. I don’t like this approach, because it has several subtle issues that are going to bite you down the road. All of them are relatively obscure, and all of them are…