On Wed, Jun 8, 2011 at 12:28 PM, Robert Haas
<robertmhaas@gmail.com> wrote:
On Mon, Jun 6, 2011 at 6:10 PM, Mike Broers <
mbroers@gmail.com> wrote:
> Thanks for the suggestion, maintenance_work_mem is set to the default of
> 16MB on the host that was taking over an hour as well as on the host that
> was taking less than 10 minutes. I tried setting it to 1GB on the faster
> test server and it reduced the time from around 6-7 minutes to about 3:30.
> this is a good start, if there are any other suggestions please let me know
> - is there any query to check estimated time remaining on long running
> transactions?
a suitable topic for a PhD thesis. :-(
The planner knows how many rows are expected for each step of the query plan, so it would be theoretically possible to compute how far along it is in processing a query based on those estimates, wouldn't it? Combine percentage complete with time elapsed and you could get somewhat close if the stats are accurate, couldn't you? Of course, I have no clue as to the internals of the planner and query executor which might or might not make such tracking of query execution possible.