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What makes Qgres unique is that it is simple.

What makes most queuing systems complex is they allow for concurrent publishers and subscribers on a single queue. That creates all kinds of headaches and race conditions.

Qgres simplifies things by forcing per-queue serialization of either publishing or consuming. That makes it simple to either track subscribers (if publishing is serialized), or to allow multiple publishers (if only one consumer can remove from the queue at once).

Obviously, there are significant drawbacks to this design. Qgres is not meant to solve every queuing need. If you need something more sophisticated in Postgres, I suggest you check out PgQ; it’s much more sophisticated … and more complicated ;).

The easiest way to install Qgres is to use the PGXN client.

To load Qgres into a database named "database_name":

Alternatively, you can use pgxn to install the extension on the server, and then lead it using CREATE EXTENSION:

If you have this repository checked out, you can use GNU make:

You will need to use CREATE EXTENSION to load the extension into your database.

Full documentation is available online or see doc/qgres.adoc.