Re: 8.4.0 data loss / HOT-related bug

Radoslaw Zielinski wrote:
> Hello,
>
> 8.4.0 installation on i686 modern Linux, a simple production app with ~4
> users entering data; normalised, no weird stuff happening there. Recently:
>
> ERROR: missing chunk number 0 for toast value 120741 in pg_toast_29644

> bug=# select id, last_modified, xmin,xmax,cmin,cmax,ctid from public.promocje where id = 4300;
> id | last_modified | xmin | xmax | cmin | cmax | ctid
> ------+----------------------------+------+------+------+------+---------
> 4300 | 2009-08-11 09:54:11.007351 | 3819 | 6179 | 0 | 0 | (539,7)
> (1 row)

I wonder if this could be explained by xid=6179 not marked as committed
in clog. I'd try flipping that bit and see what happens ...

--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support