RavenDB News | Events, Launches, Awards, And More

Search Posts

Blog

Merging documents in RavenDB with Map/Reduce

December 18, 2019

We got an interesting question in the mailing list. Given the following documents structures: We want to be able to merge these into the following output: If we had just a single skill in the professions document, that would have been easy. It would also be easy if we had the professions recorded in the skills document. But we have to merge…

Blog

Nine women, nine months, nine babies, oh MY!

December 16, 2019

An old adage about project managers is that they are people who believe that you can get 9 women together and get a baby in a single month. I told that to my father once and he laughed so much we almost had to call paramedics. The other side of this saying is that you can get nine women and get nine babies in nine months. This is usually told in…

Blog

Notes on RavenDB vs. PostgreSQL

December 12, 2019

A common question I field on many customer inquiries is comparing RavenDB to one relational database or another. Recently we got a whole spate of questions on RavenDB vs. PostgreSQL and I though that it might be easier to just post about it here rather than answer the question each time. Some of the differences are general, for all or most…

Blog

Extendible hash table–Destruction

December 6, 2019

After a long journey, I have an actual data structure implemented. I only lightly tested it, and didn’t really do too much with it. In fact, as it current stands, I didn’t even implement a way to delete the table. I relied on closing the process to release the memory. It sounds like a silly omission, right? Something that is easily fixed. But I…

Blog

Extendible hash table–Deletion II

December 5, 2019

The naïve overflow handling I wrote previously kept me up at night. I really don’t like it. I finally figured out what I could do to handle this in an elegant fashion. The idea is to: Find the furthest non overflow piece from the current one. Read its keys and try to assign them to its natural location. If successfully moved all non native keys,…

Blog

Extendible hash table–Deletion I

December 3, 2019

Building data structures is fun, until you need to actually implement all the non core stuff. In the previous post, we covered iteration, but now we have to deal with the most annoying of features, deletions. In some data structures, implementing deletions can take significantly more time and effort than all other work combined. Let’s see what it…

Blog

Extendible hash table–iteration

December 2, 2019

I run perf tests and memory utilization tests on my implementation and finally got it to the right place. But the API I have is pretty poor. I can put a key and value, or get the value by key. But we probably want a few more features. I changed the put implementation to be: This allows me to do an atomic replace and get the old value from the…

Use Cases

NoSQL Database for Greater Insight

December 2, 2019

RavenDB NoSQL Database Helps Configit Give their Customers Greater Insight to their Configurations Technology and modern manufacturing methods have laid waste to the days of “You can have any color you want as long as its black.” Customers, both individual and business, have plenty of options on how to put together exactly what they…

higher workloads schemaless document

Blog

Chen Ravid and Oren Eini – Value Open Source Videocast

November 29, 2019

I did a video cast when Chen a few weeks ago. I think it went quite well. Oren shares his story on how he taught himself how to code in “Prison” and became an open-source developer, coding a prison management system and how he founded Hibernating Rhinos. If you are an open-source developer or entrepreneur, you’ll find in this videocast some great…