This project is described in its own page, in short prefix is about speeding up prefix lookups for them to be fast. The prefix here is not the literal but the column value:
SELECT * FROM prefixes WHERE prefix @> 'literal';
slides from the Prato conference are more about developping a
PostgreSQL, but the example allowing to follow the subject is the
prefix module itself, so the mentionned slides are still a good read to
discover the project.
Or go read the prefix pgfoundry home page to get some ideas on how to use it.
prefix project is running live and the index has already been exercised
10 millions times, so I'm willing to flag the project as
production ready if you will.
The project is however still in development, as
we have some ideas on how to
speed things up some more: that's by improving the prefix range to support
arbitrary strings as delimiters, instead of just a single
char as it's now
Source code development and releases
The source code has been managed under
CVS up until version
1.0.0 but from
there it's now living over there at
github. Feel free to clone it!