| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | "Florian G(dot) Pflug" <fgp(at)phlo(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: [PATCHES] Aggressive freezing in lazy-vacuum |
| Date: | 2007-03-05 19:30:00 |
| Message-ID: | 45EC6FB8.8090603@enterprisedb.com |
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| Lists: | pgsql-hackers pgsql-patches pgsql-performance |
Florian G. Pflug wrote:
> There could be a GUC vacuum_freeze_limit, and the actual FreezeLimit
> would be calculated as
> GetOldestXmin() - vacuum_freeze_limit
We already have that. It's called vacuum_freeze_min_age, and the default
is 100 million transactions.
IIRC we added it late in the 8.2 release cycle when we changed the clog
truncation point to depend on freeze limit.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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