GIN performance (postgresql.org websearch part 2)

As I finished loading the approximately 550,000 emails in our archives into my UTF8 encoded database again (bad encoding earlier), I decided to run a quick benchmark of the different ways of doing fulltext search on it with tsearch2, partially because Devrim requested it. I ran the same query a couple of times to bring things into the cache, and then saw very stable performance on all the queries. The query I ran was:

explain analyze select count(*) from messages where fti @@ plainto_tsquery('magnus hagander');

Which should be simple and self-explaining. I got the following search times:

  • tsearch2 with no index: ~6000 milliseconds (6 seconds)
  • tsearch2 with GiST index: ~250ms (0.25 seconds)
  • tsearch2 with GIN index: ~6ms (very fast)

This shows that tsearch2 with GIN is a lot faster than the GiST version we had in 8.1. Updates are more expensive, but when your dataset has a lot more read than write, then GIN will definitly be a big win.


Conferences

I speak at and organize conferences around Open Source in general and PostgreSQL in particular.

Upcoming

Stockholm PUG 2016/3
Jun 16, 2016
Stockholm, Sweden
PGDay UK 2016
Jul 05, 2016
London, UK
PG Day'16 Russia
Jul 6-8, 2016
St Petersburg, Russia
Stockholm PUG 2016/4
Aug 31, 2016
Stockholm, Sweden
Postgres Open
Sep 13-16, 2016
Dallas, USA
PGConf.EU 2016
Nov 1-Jan 4, 2016
Tallinn, Estonia

Past

PGCon
May 17-21, 2016
Ottawa, Canada
Pycon Sweden
May 9-10, 2016
Stockholm, Sweden
Stockholm PUG 2016/2
Apr 26, 2016
Stockholm, Sweden
PGConf.US
Apr 18-20, 2016
New York, USA
pgDay Paris
Mar 31, 2016
Paris, France
More past conferences