What version of postgres?
8.0.2 ... but I think I've seen this before on 7.3 ...
There are a few possibilities. If you are having a lot of updates to the
table, you can get index bloat. And vacuum doesn't fix indexes. You have
to "REINDEX" to do that. Though REINDEX has the same lock that VACUUM
FULL has, so you need to be a little careful with it.
Probably better is to do CLUSTER, as it does a REINDEX and a sort, so
your table ends up nicer when you are done.
Thanks, will try those next time this problem crops up (i just deleted /
recreated the database to speed things for its users in the office ...
probably should have held off to see if I could find a solution first!).
Yes, the database / table-in-question does have a lot of updates, deletes,
and new rows (relatively speaking for a small business).
Would CLUSTER / REINDEX still have an effect if our queries were done via
sequential scan? This is a old database (as in built by me when i was just
starting to learn unix / postgres) so the database design is pretty horrible
(little normalisation, no indexes).
Have taken Chris's advice onboard too and setup cron to do a vacuumdb hourly
instead of my weekly vacuum.
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