Re: Why so slow?

> > INFO: index "job_log_id_pkey" now contains 10496152 row versions in
> > 59665 pages
>
>See the 10496152 above? That means you have 10496152 rows of data in your
>table. If those, only 365000 are alive. That means you have basically
>never vacuumed this table before, correct?

Almost correct :| I have vacuumed this table monthly (obviously not nearly
enough), but it
is basically a log of events of which there are a very large number of each
day.

>
>Every update or delete creates a new dead row. count(*) scans the whole
>table, dead rows included. That's why it takes so long, the table acts as
>though it has 10496152 rows when doing sequential scans.

Oh! This explains my problems.

>
>Do a VACCUM FULL on it or CLUSTER it on on a index, both of which will
>empty
>out all the free space and make it behave as it should. Note; VACUUM FULL
>will take quite a while and requires an exclusive lock on the table.
>CLUSTER also requires an exclusive lock but should be a lot faster for this
>table.
>
>Oh, and get autovacuum setup and working, posthaste.

The exclusive lock is going to cause problems for me since the table is very
active. Is there a way of getting around that or do I need to schedule the
application that accesses this table?

I'm running version 8.0. Is there autovacuum for this version too?

Regards,
Bealach