Frequently Asked Questions

What is Redis / StructD?
  • Redis is a database that stores data structures in RAM during runtime
  • StructD is Dr. Josiah’s fork of Redis, to provide a collection of changes that we consider to be improvements
  • We hope these changes eventually make it into open source Redis, but there are few guarantees in life
  • See Performance Improvements and Usability Improvements
How do I use Redis / StructD?
  • Dr. Josiah has several posts directly relating to Redis / StructD and some of their use cases on his blog: Redis tagged
  • The official Redis web page has a lot of documentation
  • The open source StructD web page has additional documentation
  • While missing some recent topics, Dr. Josiah’s book covers much of what it takes to get started and be effective using Redis or StructD
  • Searching Google or Stack Overflow might be helpful, or you can always ask on our public mailing list.
Do you have cloud hosting available?
  • Coming soon, contact our sales team to let us know you’re interested and we will contact you as soon as it is available
Why should I consider paying for support or a partner membership?
  • You need Dr. Josiah to answer to your question
  • You want to ensure Dr. Josiah is around to answer your questions in the future, regardless of how large your Redis or StructD needs grow
  • You like improved performance and lower overhead, and want Dr. Josiah to continue his optimizations
I’m using open-source self-hosted Redis now, why should I consider paying for a StructD license?
  • We have Performance Improvements
  • We have Usability Improvements
  • Future plans include reducing structure memory overhead, making transactions computationally “free”, and further Lua runtime performance improvements
  • By supporting StructD, you ensure that our future plans are fulfilled, and that those changes become open source
  • Paying customers’ votes get more weight for future improvements to StructD
Why does purchasing a license allow me to run 2 production + 2 non-production? Why isn’t the price half for half as much? Why don’t you license production vs non-production separately?
  • StructD Commercial Edition is intended to be used by companies who want to use Structd or a Redis-protocol compatible daemon. Nearly all interesting uses of StructD (or Redis) that the authors have been involved with required at least one master and one replica in production, at least one shared development / testing instance, and at least one staging instance. We give you everything you need for that very standard setup with one license.
  • Smaller setups than two production instances don’t need the performance enhancements that are highlighted in the commercial edition of StructD, and would likely be better served by the open source edition available at
  • Reducing the cost of a license and giving you fewer rights per license only means that 99% of customers buying a license will be buying 2+, or will buy 1, then come back 2-6 weeks later to buy a 2nd license. Trying to convince 99% of customers to select ‘2’ instead of ‘1’ is silly, so we don’t. Instead, we include what you actually need right up front.
  • The included non-production licenses are meant to allow you, the developer, customer, and user of StructD Commercial Edition to be able to build software using the same tools in development as in production. Our accountants tell us that keeping our production + non-production install per license in parity helps prevent license abuse. We hope that our customers are so happy with the product, they see the license fee and smile, because of the money they save.
Can we get a site license for non-production StructD instances?
Why did you fork Redis?
  • Dr. Josiah needs transactions and other improvements to a Redis-like daemon
  • Salvatore doesn't want transactions with rollbacks in Open Source Redis
  • Seems we are at an impasse
  • To get transactions with rollbacks, along with other improvements that Dr. Josiah needs for his work, a fork was necessary
  • To ensure that those further changes make it into StructD, it is being commercialized.
Why are you commercializing StructD?
  • Dr. Josiah’s experience in giving away software has netted him little in 16 years, but has otherwise found success writing software and mentoring for a variety of ~Silicon Beach, CA startups and organizations
  • Dr. Josiah and his team can spend their days working for someone doing something else, with evenings and weekends trying to make what Dr. Josiah needs StructD to be, or we can try to commercialize our improvements, which may be what others need.
  • All of StructD is intended to be open source long-term, though changes slowly percolate from our commercial edition to the open source edition due to development priorities. Want us to devote more time? Get a support package, and vote! Or don’t use StructD out of principle, and hope that someone else will support the StructD team enough to make sure that everything goes open source before the dream dies.
  • Each of our products / services has a “cost” for us to deliver that product / service. We charge above that cost to generate a “net” revenue per sale of a given product / service. Part of our “be a responsible member of the community” plan is to donate portions of our net revenue per sale to open source projects that are either direct ancestors of code of StructD, or to open source authors in the community that we think should be supported.
Who is Dr. Josiah?
  • Dr. Josiah Carlson Ph.D. is an American Theoretical Computer Scientist, best well known for his book on Redis; Redis in Action, his talks on Redis and/or Python, his open source libraries relating to Python, Redis, Lua, thousands of public mailing list posts relating to Redis, Python, wxPython, and/or data compression, as well as a handful of blog posts relating to the same. Professionally, the good doctor has worked on email anti-spam, text search, non-binary classification, GPS navigation, data compression, streaming video, social networks, web ads, database technology, business finance, and ETL pipelines. In open source, Josiah offers libraries for timezone-aware cron libraries in Python, a SQLAlchemy-like object layer for Redis , a task queue scheduler, and more.
  • Dr. Josiah has given talks at LADevOps August 2011, LAWebSpeed 2012, Redisconf 2012 and 2015, Postgres Conf 2012, Py Data Science LA meetups January 2017 and December 2017, and sat on an Entrepreneurship panel at AWS re:Invent 2012.
  • If you would like to see Dr. Josiah give a self-introduction, where he discusses some of his work personally and professionally, you can watch him here. Or you can see some of his public / personal work at his blog, or professional work at LinkedIn.

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