Re: SET TIME ZONE with GMT+X notation

--- Tom Lane <tgl@sss.pgh.pa.us> wrote:
> jason_priebe@yahoo.com (Jason Priebe) writes:
> > Note that it uses timeofday() for the default for
> one timestamp and
> > "now" for the default for the other (we've been
> experimenting with the
> > differences between the two, as we've seen some
> serious drift in the
> > values returned by "now" -- but that's another
> story).
>
> Uh, have you read
>
http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions-datetime.html#FUNCTIONS-DATETIME-CURRENT
>
> particularly the point about
>
>   It is important to realize that CURRENT_TIMESTAMP
> and related functions
>   return the start time of the current transaction;
> their values do not
>   change during the transaction. timeofday() returns
> the wall clock time
>   and does advance during transactions.

Yep.  I understand that.  We're having some issues
with our application where gradually the values from
CURRENT_TIMESTAMP fall further and further behind.
As far as we know, we don't have any transactions
open.  We are, however, using PHP's pg_pconnect()
function to connect to the database.  The only thing
I can think of is that perhaps a transaction is left
hanging (perhaps due to abnormal termination of a
process), and then another process picks up that
pooled connection and "inherits" the open transaction?
It doesn't make a lot of sense, but it's the only
thing I can think of.

-Jason Priebe


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