Re: Hot standby and b-tree killed items - Mailing list pgsql-hackers

On Sat, 2008-12-20 at 20:09 -0300, Alvaro Herrera wrote:
> Heikki Linnakangas wrote:
> > Gregory Stark wrote:
> >> A vacuum being replayed -- even in a different database -- could trigger the
> >> error. Or with the btree split issue, a data load -- again even in a different
> >> database -- would be quite likely cause your SELECT to be killed.
> >
> > Hmm, I wonder if we should/could track the "latestRemovedXid" separately  
> > for each database. There's no reason why we need to kill a read-only  
> > query in database X when a table in database Y is vacuumed.
> 
> What about shared catalogs?

Hot Standby already covers this special case. Patch uses
GetCurrentVirtualXIDs(), which treats a dbOid of 0 to match against all
databases.

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Training, Services and Support