Re: Toast space grows

In response to "Pavel Rotek" <pavel.rotek@gmail.com>:

>
> There are inserts and few updates (but what do you mean with update??


He means adding or changing data in the table.

> committed update??, because there are many updates of the log attribute in
> trasaction, we do periodical flush during transaction)


Are you saying you have long-running transactions?  How long does a
single transaction take?

Transactions prevent vacuum from being able to clean up.  Long running
transactions tend to render vacuum ineffective.

>, sum takes
> approximately 1,2G, and i mean vacuum full (but there is no lock on the
> table when running vacuum full). I haven't try plain vacuum.


Don't do vacuum full on this table.  Do frequent vacuums.  The table will
bloat some, but not 10x the required size, once you find a reasonable
frequency for vacuums.  You might find it practical to manually vacuum
this table from your application after insert and update operations.

>
> 2008/3/7, Richard Huxton <dev@archonet.com>:
> >
> > Pavel Rotek wrote:
> > > Hello,
> > >
> > > i have problem with following table...
> > >
> > > create table dataaction (
> > >    id INT4 not null,
> > >    log text,
> > >    primary key (id)
> > > );
> > >
> > > It is the table for storing results of long running jobs. The log
> > attribute
> > > takes approximately 5MB for one row (there is about 300 rows). My
> > problem
> > > is, that table dataaction takes after restoring about 1,5G, but in few
> > days
> > > grows to 79G(Toast space)...
> >
> >
> > 1. What is happening with this table - just inserts, lots of updates?
> >
> > 2. What does SELECT sum(length(log)) FROM dataaction; show?
> >
> >
> >   > Vacuum on the table doesn't finish.
> >
> >
> > A plain vacuum doesn't finish, or vacuum full doesn't finish?
> >
> >
> > --
> >    Richard Huxton
> >    Archonet Ltd
> >
>



--
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran@collaborativefusion.com
Phone: 412-422-3463x4023

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