| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Heavy write activity on first vacuum of fresh TOAST data |
| Date: | 2007-12-13 21:40:10 |
| Message-ID: | 1197582010.4255.1912.camel@ebony.site |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Thu, 2007-12-13 at 15:19 -0600, Kevin Grittner wrote:
> >>> On Thu, Dec 13, 2007 at 12:12 PM, in message
> <1197569564(dot)4255(dot)1855(dot)camel(at)ebony(dot)site>, Simon Riggs <simon(at)2ndquadrant(dot)com>
> wrote:
> > On Thu, 2007-12-13 at 11:46 -0600, Kevin Grittner wrote:
> >> If the hint bit changes are written to the WAL ...
> >
> > They're not.
>
> So one would expect a write-intensive initial vacuum after a
> PITR-style recovery?
Very perceptive. I was just thinking about that myself. An interesting
issue when running with full_page_writes off.
> What impact would lack of the hint bits have until a vacuum?
Vacuum isn't important here. Its the first idiot to read the data that
gets hit.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
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