Find out the features of the Polyhedra family of relational DBMS products, and how to use them!

This web site contains a lot of information about the Polyhedra family of relational DBMS products, including descriptions of the special features, a number of technical notes, and a copy of the reference manuals for the latest release of Polyhedr. A good place to start, though, is to have a quick look at a webcast giving a 5-minute demo of Polyhedra. Then, use the links in the left-hand tool bar to find out more!

Polyhedra Support

Customers who have purchased Polyhedra developer licenses for particular platform(s) can take out annual support licenses, which allows them to contact the Polyhedra support desk to report bugs and problems; it also allows them to obtain new releases as they become available for their licensed platforms, including upgrades.

About this site

This site is maintained by Enea staff, and we try to keep it accurate. However, as described here, errors will creep in; if in doubt, check with the reference manuals, all of which are available in PDF form for off-line reading.  If you spot an error on this site and you have a support contract, you can report it via the Polyhedra support desk; if not, please report it via an email to (Please do not send support questions to the webmaster!)

Site updates

When we make significant changes to the site, the Polyhedra webmaster will post something to the Twitter account @PolyhedraDBMS

Latest news

  • Polyhedra 9.2 released: reduced memory usage, RDI API, OPC UA RDI and SQL EXPLAIN

Polyhedra 9.2 significantly reduces the memory overhead when storing many records in a table, simplifies the writing of Remote Device Interfaces (RDI) by providing a new C++ RDI API, includes a sample OPC UA RDI implemented using the new RDI API, which is an OPC UA client providing access to data stored in an OPC UA server, and allows easier user optimisation of SQL queries by providing a new SQL EXPLAIN command that describes how SQL queries are executed.

Older news

  • Polyhedra 9.1 released: enhanced data subscription, performance monitoring and Python interface
Polyhedra 9.1 significantly enhances the data subscription feature introduced in Polyhedra 9.0 with the addition of bi-directional subscription and partial table replication, introduces a way to monitor the internal resources used by a running RTRDB, such as memory, threads and client connections, and adds a new standard Python DB-API client interface with extensions for Polyhedra-specific features such as active queries.
  • running the ADO.NET data provider for Polyhedra
There is a new video which show how the ADO.NET data provider for Polyhedra can be installed, and then goes on to compile and run a C# program that uses this new API to monitor (via an active query) and update a Polyhedra database. We have also updated the page on connecting to a Polyhedra server to cover this new API.
  • a new video showing the database subscription feature in action
This 4-minute video illustrates why Polyhedra is so well suited for SCADA, Industrial control and Internet of Things (IoT) applications. It shows a fault-tolerant Polyhedra database capturing information from a remote database by means of the database subscription feature, with time-series being stored in the Polyhedra historian ready for use in trend diagrams and for off-line analysis. The remote database has been set up to record recent readings in case the link to the main database is down, so that the historian can be back-filled when the connection is re-established. There is also a 'how-to' guide giving details of the set-up.
  • Polyhedra 9.0 released: faster, more flexible and more scaleable!
Polyhedra 9.0 introduces substantial performance improvements, a way of allowing a database to keep a live cache of information retrieved from other Polyhedra databases, and an ADO.NET data provider that allows the .NET programmer to take advantage of Polyhedra-specific features such as active queries. For more details, click here. (There are now videos on the two new features, see above!)
  • Using Enea Element to control Polyhedra fault tolerance
If you are using Enea's Element product to monitor and control complex embedded systems that need high availability, it makes sense to control Polyhedra via Element as well. We have just created a new section on using Polyhedra with Element, and the first topic covered is an Element 'shim' that acts as an arbitrator for Polyhedra. We have also published a one-minute video showing this shim in action! 
  • Polyhedra on the Pi2
The Raspberry Pi Foundation has released the Pi 2 board, which uses a faster processor and has double the about of RAM. To get full advantage of this processor applications will have to be recompiled using the ARM11 instruction set - but existing code will work on it, and Polyhedra will run 4-8 times faster! We've posted a comment about the performance improvement over on the Raspberry Pi forum.