What I want to count is the number of plans that have been considered
cheapest_path. Since if a path is considered to be a cheapest_path, the
postgres optimizer need to spent time on comparison. I think this is what I
want.
2009/10/4 Martijn van Oosterhout klep...@svana.org
On Sat, Oct 03,
Is it a reasonable idea to add a counter to set_cheapest? I think this
function evaluate the cheapest path. Therefore, it means how many complete
plans have been considered, doesn't it?
2009/10/12 纪晓曦 sheep...@gmail.com
What I want to count is the number of plans that have been considered
=?UTF-8?B?57qq5pmT5pum?= sheep...@gmail.com writes:
Is it a reasonable idea to add a counter to set_cheapest?
You can try it but I think you'll find it's not terribly useful.
That will effectively just give you a count of the number of join
combinations that were considered (plus the number of
Yeah, the problem is when I test large join, the plan considered by geqo is
large than path. (3000+ vs 500+). However, the time used in optimizer of
geqo is 1/4 of path. By the way, I use the same query.
Another thing is for the join of 2 tables, geqo consider 60-90 plans.
In general, I think for
On Sat, Oct 03, 2009 at 04:20:59PM +1000, ? wrote:
Since I also need to consider gego, is this the best way to do it?
I think you need to be clearer about what you're trying to count.
Consider a nestjoin plan where:
- For the inner side it considers 7 paths and throws away 4.
- For the
Since I also need to consider gego, is this the best way to do it?
2009/9/30 Tom Lane t...@sss.pgh.pa.us
=?UTF-8?B?57qq5pmT5pum?= sheep...@gmail.com writes:
Where can I add a integer counter to count the plans considered by
planner.
Well, you could count the number of calls to add_path,
Where can I add a integer counter to count the plans considered by planner.
In my opinion, it is in the src/backend/optimizer/path directorty.
=?UTF-8?B?57qq5pmT5pum?= sheep...@gmail.com writes:
Where can I add a integer counter to count the plans considered by planner.
Well, you could count the number of calls to add_path, but a path is
hardly the same thing as a complete plan.
regards, tom lane
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