| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Vacuum, Freeze and Analyze: the big picture |
| Date: | 2013-06-02 22:20:30 |
| Message-ID: | CA+TgmoZ1XZThxegpeEz-7p9ZA+qAzVeHUDocytN8brHDd0v0Dw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Jun 2, 2013 at 2:44 PM, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
> Do we know why anti-wraparound uses so many resources in the first place?
> The default settings seem to be quite conservative to me, even for a system
> that has only a single 5400 rpm hdd (and even more so for any real
> production system that would be used for a many-GB database).
>
> I wonder if there is something simple but currently unknown going on which
> is causing it to damage performance out of all proportion to the resources
> it ought to be using.
I can't rule that out. Personally, I've always attributed it to the
fact that it's (a) long and (b) I/O-intensive. But it's not
impossible there could also be bugs lurking.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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