How can I tell if I"m autovacuuming?

am 22.05.2010 15:51:07 von Doug Gorley

From what I see in the docs, these three settings in postgresql.conf
should be enough for PostgreSQL (8.2) to autovacuum with the default
settings:

autovacuum = on
stats_start_collector = on
stats_row_level = on

So, two questions:

(a) Is this correct? Should autovacuum be functional now?
(b) How can I verify that my databases are being vacuumed by autovacuum?

Thanks,

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Doug Gorley | doug@gorley.ca

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Re: How can I tell if I"m autovacuuming?

am 22.05.2010 19:11:23 von Joshua Drake

On Sat, 2010-05-22 at 09:51 -0400, Doug Gorley wrote:
> From what I see in the docs, these three settings in postgresql.conf
> should be enough for PostgreSQL (8.2) to autovacuum with the default
> settings:
>
> autovacuum = on
> stats_start_collector = on
> stats_row_level = on
>
> So, two questions:
>
> (a) Is this correct? Should autovacuum be functional now?

If you restarted.

> (b) How can I verify that my databases are being vacuumed by autovacuum?

pg_stat_user_tables should have a last_autovac column.

>
> Thanks,
>
> --
> Doug Gorley | doug@gorley.ca
>
>

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Re: How can I tell if I"m autovacuuming?

am 25.05.2010 14:31:50 von Ireneusz Pluta

>> (b) How can I verify that my databases are being vacuumed by autovacuum?
>>
>
> pg_stat_user_tables should have a last_autovac column.
>
Also, you can see autovacuum related messages like:

DEBUG: autovacuum: processing database "postgres"
DEBUG: autovacuum: processing database "template1"

in your server log, by setting log_min_messages to 'debug1' in your
postgresql.conf.
As a side effect you may also see some other messages enabled with the
same debug level,

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Re: How can I tell if I"m autovacuuming?

am 25.05.2010 20:40:04 von Mitch Collinsworth

On Sat, 22 May 2010, Joshua D. Drake wrote:

> On Sat, 2010-05-22 at 09:51 -0400, Doug Gorley wrote:
>> From what I see in the docs, these three settings in postgresql.conf
>> should be enough for PostgreSQL (8.2) to autovacuum with the default
>> settings:
>>
>> autovacuum = on
>> stats_start_collector = on
>> stats_row_level = on
>>
>> So, two questions:
>>
>> (a) Is this correct? Should autovacuum be functional now?
>
> If you restarted.
>
>> (b) How can I verify that my databases are being vacuumed by autovacuum?
>
> pg_stat_user_tables should have a last_autovac column.

I'm wondering about the same question. I did the above and restarted,
and now my pg_stat_user_tables looks like this:

postgres=# \d pg_stat_user_tables
View "pg_catalog.pg_stat_user_tables"
Column | Type | Modifiers
---------------+--------+-----------
relid | oid |
schemaname | name |
relname | name |
seq_scan | bigint |
seq_tup_read | bigint |
idx_scan | bigint |
idx_tup_fetch | bigint |
n_tup_ins | bigint |
n_tup_upd | bigint |
n_tup_del | bigint |
View definition:
SELECT pg_stat_all_tables.relid, pg_stat_all_tables.schemaname, pg_stat_all_tables.relname, pg_stat_all_tables.seq_scan, pg_stat_all_tables.seq_tup_read, pg_stat_all_tables.idx_scan, pg_stat_all_tables.idx_tup_fetch, pg_stat_all_tables.n_tup_ins, pg_stat_all_tables.n_tup_upd, pg_stat_all_tables.n_tup_del
FROM pg_stat_all_tables
WHERE pg_stat_all_tables.schemaname <> 'pg_catalog'::name AND pg_stat_all_tables.schemaname <> 'pg_toast'::name AND pg_stat_all_tables.schemaname <> 'information_schema'::name;

I don't see a last_autovac column, but I also don't see it in the
View definition.

So is this saying:
a) autovacuum is not running?
b) Something needs to update the view definition?
c) I need to wait [insert some period of time or number of transactions]
before autovacuum runs and something updates the view definition?
d) none of the above?

-Mitch

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Re: How can I tell if I"m autovacuuming?

am 25.05.2010 20:59:37 von Alvaro Herrera

Re: How can I tell if I"m autovacuuming?

am 25.05.2010 21:38:38 von Mitch Collinsworth

Re: How can I tell if I"m autovacuuming?

am 25.05.2010 21:53:49 von Alvaro Herrera

Excerpts from Mitch Collinsworth's message of mar may 25 15:38:38 -0400 2=
010:

> On Tue, 25 May 2010, Alvaro Herrera wrote:

> > I'd say you're running 8.1, not 8.2 as initially stated.
>=20
> Well... yes. Sorry. I take it the answer is different then...
>=20
> So... How can I tell if I'm autovacuuming in 8.1.21?

Crank log_min_messages down to debug2 and check the log for DEBUG
messages talking about databases and tables processed by autovacuum.
(I think debug1 produces enough data, I can't recall precisely).

8.1 was the first release to sport integrated autovacuum. It was very
rough around the edges. If you're depending on its behavior, I suggest
you upgrade.

--=20
Ãlvaro Herrera
Command Prompt, Inc. -- The PostgreSQL Company

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