Re: pg_locks view versus prepared transactions

On Mon, Jun 20, 2005 at 04:18:03PM -0400, Tom Lane wrote:

> However, all you could get from ProcArray would be the database in
> which the backend is running, and maybe the owning user's ID if we
> cared to expend the extra space to store it there.  We're certainly
> not going to add current_query or any such thing into that array.

You could show the current transaction Id, which is also useful.
(Presently there's no way to know even a backend's own TransactionId,
and people is suggested to use hacks like insert a row in a table and
check its xmin.)

Maybe we could add an adittional view, with all the info from ProcArray,
which is useful sometimes.  Then you could join that to pg_locks, and it
would work even if the statistic collector is disabled.

-- 
Alvaro Herrera (<alvherre[a]surnet.cl>)
"La felicidad no es mañana. La felicidad es ahora"