Re: Vacuum only with 20% old tuples

> On Wed, 12 Jul 2000, Bruce Momjian wrote:
> 
> > > > I do not see what your 20% idea has to do with this, though, nor
> > > > why it's a good idea.  If I've told the thing to vacuum I think
> > > > it should vacuum.  20% of a big table could be a lot of megabytes,
> > > > and I don't want some arbitrary decision in the code about whether
> > > > I can reclaim that space or not.
> > > 
> > > I wouldn't mind seeing some automagic vacuum happen *if* >20% expired
> > > ... but don't understand the limit when I tell it to vacuum either ...
> > 
> > I am confused by your comment.
> 
> Make the backend reasonably intelligent ... periodically do a scan, as
> you've suggested would be required for your above 20% idea, and if >20%
> are expired records, auto-start a vacuum (settable, of course) ...

Would be good if we could to vacuum without locking.  We could find a
table when things are mostly idle, and it then.

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