From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>, Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [COMMITTERS] pgsql-server: Rearrange pg_subtrans handling |
Date: | 2004-08-24 11:06:36 |
Message-ID: | 200408241106.i7OB6a822362@candle.pha.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers pgsql-hackers |
Christopher Kings-Lynne wrote:
> > I think the speed complaint I was just raising could possibly be
> > answered by setting an infomask bit indicating that the row might
> > be present in a separate table of active row locks. (I'm not sure
> > how the bit would get cleared without race conditions, but let's
> > suppose that can be done.) A little hashing, a little spill-to-disk
> > logic, and it might be done. But that's just handwaving... anyone
> > want to try to fill in the details?
>
> I vote Alvaro :) This stuff is way out of my league - I'm just the
> ideas man :D
>
> Either way - Bruce, did you want to add a summary of these ideas to the
> TODO?
OK, TODO updated:
* Implement dirty reads or shared row locks and use them in RI triggers
Adding shared locks requires recording the table/rows numbers in a
shared area, and this could potentially be a large amount of data.
One idea is to store the table/row numbers in a separate table and set
a bit on the row indicating looking in this new table is required to
find any shared row locks.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2004-08-24 11:09:45 | pgsql-server: Update item: < * Implement dirty reads or shared row |
Previous Message | Bruce Momjian | 2004-08-24 11:06:23 | Re: [COMMITTERS] pgsql-server: Rearrange pg_subtrans handling |
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2004-08-24 11:07:27 | Re: AT TIME ZONE |
Previous Message | Bruce Momjian | 2004-08-24 11:06:23 | Re: [COMMITTERS] pgsql-server: Rearrange pg_subtrans handling |