Re: Autovacuum ideas

[Robin Iddon <robin@xxxxxxxxxx>]

Brendan Duddridge wrote:
> What I'd like to see is a table exclusion list. I have a few very 
> large history tables that are never updated or deleted, only inserts 
> and selects.

Such a table will never trigger the vacuum rules as I understand them 
(vacuum only happens on table that have obsolete tuples, which means 
update or delete).

It will correctly trigger the analyze rules now and then, but analyze is 
cheap compared to vacuum and is desirable because it will help the 
planner do it's job (assuming that querying the table is important to 
you).  Remember analyze only requires a read-lock on the table so it can 
run in parallel with other queries quite happily.

If you really need to disable autovac on a table you can disable 
pg_autovacuum from running on a specific table by creating a row for 
your table in pg_autovacuum table and setting the pg_autovacuum.enabled 
to false.



Robin