Anyone heard of Operational Data Historians? Like OSISoft's PI, Honeywell's PHD, GE's Proficy. They're expensive suites of software that have optimal real-time

Anyone heard of Operational Data Historians? Like OSISoft's PI, Honeywell's PHD, GE's Proficy. They're expensive suites of software that have optimal real-time ability, plus historical access. They usually work in process control/operations of factories or manufacturing plants. Each item being measured is called a tag. Just thought I'd throw this out there since its a specialised area that not many people know about. I've done some work with them in terms of writing adaptors to a time series data visualisation product. http://en.wikipedia.org/wiki/Operational_historian http://en.wikipedia.org/wiki/Operational_historian http://en.wikipedia.org/wiki/OSIsoft http://en.wikipedia.org/wiki/OSIsoft https://www.honeywellprocess.com/en-US/training/programs/advanced-applications/Pages/uniformance-phd.aspx https://www.honeywellprocess.com/en-US/training/programs/adv... http://www.geautomation.com/products/proficy-historian http://www.geautomation.com/products/proficy-historian On the topic of Historians vs Relational Databases, theres a blog post here about it ... https://osipi.wordpress.com/2010/07/05/relational-database-vs-process-historian-for-process-data-use-both/ https://osipi.wordpress.com/2010/07/05/relational-database-v... ... admittedly this is by the developer OSISoft so it may be biased, but their points seem valid. Especially the swinging door algorithm reference and the fact they are far more efficient in storage.