Re: vacuum, performance, and MVCC - Mailing list pgsql-hackers

From Jonah H. Harris
Subject Re: vacuum, performance, and MVCC
Date
Msg-id 36e682920606240837g4c508ef3s62dcbadbfff5d5fe@mail.gmail.com
Whole thread Raw
In response to Re: vacuum, performance, and MVCC  ("Mark Woodward" <pgsql@mohawksoft.com>)
Responses Re: vacuum, performance, and MVCC  ("Mark Woodward" <pgsql@mohawksoft.com>)
List pgsql-hackers
On 6/24/06, Mark Woodward <pgsql@mohawksoft.com> wrote:
> > On 6/24/06, Mark Woodward <pgsql@mohawksoft.com> wrote:
> >> In the scenario, as previously outlined:
> >>
> >> ver001->verN->...->ver003->ver2->|
> >>   ^-----------------------------/
> >
> > So you want to always keep an old version around?
>
> Prior to vacuum, it will be there anyway, and after vacuum, the new
> version will become ver001.

So you do intend to move verN into ver001's slot?  What about the
other conditions you had mentioned where you have to follow
PostgreSQL's current behavior?  How are you going to have a pointer
chain in that case?


-- 
Jonah H. Harris, Software Architect | phone: 732.331.1300
EnterpriseDB Corporation            | fax: 732.331.1301
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