| From: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Bruce Momjian" <bruce(at)momjian(dot)us>, "PostgreSQL-patches" <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: Improvement of procArray.xmin for VACUUM |
| Date: | 2007-03-26 19:27:11 |
| Message-ID: | 1174937231.6069.428.camel@silverbirch.site |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-patches |
On Fri, 2007-03-23 at 17:35 -0400, Tom Lane wrote:
> To make intra-transaction advancing of xmin possible, we'd need to
> explicitly track all of the backend's live snapshots, probably by
> introducing a "snapshot cache" manager that gives out tracked
> refcounts
> as we do for some other structures like catcache entries. This might
> have some other advantages (I think most of the current CopySnapshot
> operations could be replaced by refcount increments)
Seems like we should do this for many reasons, whether or not this is
one of them. I seem to have butted heads and lost more than once with
not being able to tell which Snapshots exist.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Simon Riggs | 2007-03-26 19:37:16 | Re: Improvement of procArray.xmin for VACUUM |
| Previous Message | Tom Lane | 2007-03-26 17:01:09 | Re: [pgsql-patches] [HACKERS] less privileged pl install |