Обсуждение: autovacuum ignore tables

"Sriram Dandapani" <sdandapani@counterpane.com> writes:
> I am trying to get autovacuum to complete quicker and prevent Xactn
> wraparound (currently, it takes very long and due to the fact that I
> have to restart the database for maintenance purposes), autovacuum never
> finishes.)

Why are you restarting the database?  There is no "maintenance purpose"
I'm aware of that requires routine postmaster restarts.

As for suppressing autovac on specific tables, see the pg_autovacuum
system catalog.

            regards, tom lane

I have a high traffic table which is populated by a trigger on another
table. This high traffic table is partitioned by day. When I issue a
drop table on a child table..it goes into a wait state AND puts all jdbc
inserts  in a wait state.(in short..a deadlock). I can repeat this use
case any time.

The only way to guarantee all drops to work is to briefly shutdown ,
modify pg_hba.conf to disallow client access, restart and issue the drop
commands (followed by restoration of original pg_hba.conf)



-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Monday, September 18, 2006 1:32 PM
To: Sriram Dandapani
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] autovacuum ignore tables

"Sriram Dandapani" <sdandapani@counterpane.com> writes:
> I am trying to get autovacuum to complete quicker and prevent Xactn
> wraparound (currently, it takes very long and due to the fact that I
> have to restart the database for maintenance purposes), autovacuum
never
> finishes.)

Why are you restarting the database?  There is no "maintenance purpose"
I'm aware of that requires routine postmaster restarts.

As for suppressing autovac on specific tables, see the pg_autovacuum
system catalog.

            regards, tom lane

Sriram Dandapani wrote:
>
> Hi
>
>
>
> Is it possible to tell autovacuum to ignore certain tables (These
> tables are high traffic daily partition tables that get dropped every
> other day).
>
>
>
> I am trying to get autovacuum to complete quicker and prevent Xactn
> wraparound (currently, it takes very long and due to the fact that I
> have to restart the database for maintenance purposes), autovacuum
> never finishes.)
>
If you are running PostgreSQL 8.1 with integrated autovacuum, then yes,
you can disable autovacuum on a per table basis, if you are using an
older version with the contrib autovacuum, then no.

Matt

If I tell autovacuum to ignore the high traffic daily partition tables
that get dropped regularly, will it reset the transaction id wraparound
counter when it is done?

-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Monday, September 18, 2006 1:32 PM
To: Sriram Dandapani
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] autovacuum ignore tables

"Sriram Dandapani" <sdandapani@counterpane.com> writes:
> I am trying to get autovacuum to complete quicker and prevent Xactn
> wraparound (currently, it takes very long and due to the fact that I
> have to restart the database for maintenance purposes), autovacuum
never
> finishes.)

Why are you restarting the database?  There is no "maintenance purpose"
I'm aware of that requires routine postmaster restarts.

As for suppressing autovac on specific tables, see the pg_autovacuum
system catalog.

            regards, tom lane