I can't give you a comparison, but for what it's worth, it is used on the Postgres documentation and mailing list archives. I mention this because you can play

I can't give you a comparison, but for what it's worth, it is used on the Postgres documentation and mailing list archives. I mention this because you can play with it and get an intuitive sense of its performance and subjective usefulness. http://archives.postgresql.org/ http://archives.postgresql.org/ http://www.postgresql.org/search/?u=%2Fdocs%2F9.1%2F&q=create+table http://www.postgresql.org/search/?u=%2Fdocs%2F9.1%2F&q=c... It's also handy because you can combine it with relational data. For example, if you search from a manual page of a particular version of Postgres, it'll only return results from that version. The main performance limitation is probably update/insert rate, and it doesn't has as many features as a dedicated IR-type system, but it's frequently good-enough and already present.