Alvaro Herrera <[EMAIL PROTECTED]> writes:

> Gregory Stark wrote:
> > Tom Lane <[EMAIL PROTECTED]> writes:
> > 
> > > Matteo Sgalaberni <[EMAIL PROTECTED]> writes:
> > > > Good to know this...but why this behaviour? it'is lovely...:)
> > > 
> > > Open transactions are tracked across the whole cluster.  This is
> > > necessary when vacuuming shared catalogs.  In principle we could
> > > track per-database xmin values as well, but the distributed overhead
> > > that'd be added to *every* GetSnapshotData call is a bit worrisome.
> > 
> > Don't we do that now in CVS (ie, in 8.2)?
> 
> No, we don't.

I must be misunderstanding Tom's comment then. 

What I'm referring to is lazy_vacuum_rel() calls vacuum_set_xid_limits with
the relisshared flag of the relation. vacuum_set_xid_limits passes that to
GetOldestXmin as the allDbs parameter. GetOldestXmin ignores transactions not
connected to the same database unless allDbs is true.

-- 
greg


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