Re: VACUUMing for 30 minutes

<ogjunk-pgjedan(at)yahoo(dot)com> writes:
> Now, I run VACUUM religiously every night, across all tables, but maybe
> that's an overkill for th number of updates and inserts in this DB.

Or maybe it's not enough? How many updates/deletes do you do in an
average day?

> INFO: Pages 303359: Changed 23, Empty 0; Tup 114182: Vac 47, Keep 273,
> UnUsed 11798506.

You've got 303359 pages holding only 114182 tuples, which means this
table is *at least* two-thirds empty, and probably a lot more; there's
no way to tell from this output what the average tuple size is, but
I bet it's a lot less than a page. The indexes look pretty bloated too.

I would recommend CLUSTERing the table on one index or another as the
easiest way of cleaning it up. A somewhat faster way would be to drop
the indexes, VACUUM FULL, re-make the indexes, but there's more chance
of mistakes that way.

Once you've got the tables de-bloated, take another look at your FSM
settings; it's a good bet they are not high enough for your database
size.

regards, tom lane