Re: SORT performance - slow?

[Samuel Gendler <sgendler@xxxxxxxxxxxxxxxx>]

Plus the entire explain analyze output into the form at http://explain.depesz.com/ and you'll get a nicely human readable output which shows both the inclusive and exclusive time spent on each step of the query.  It also highlights any steps which show inaccurate statistics.  It will also give you a perma-link which you can use in emails so that everyone else can see the pretty version, too.

On Thu, May 19, 2011 at 2:13 PM, Strange, John W <john.w.strange@xxxxxxxxxxxx> wrote:

Am I reading this right in that the sort is taking almost 8 seconds?

 

"GroupAggregate  (cost=95808.09..95808.14 rows=1 width=142) (actual time=14186.999..14694.524 rows=315635 loops=1)"

"  Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sum(sq.v)"

"  Buffers: shared hit=9763"

"  ->  Sort  (cost=95808.09..95808.09 rows=1 width=142) (actual time=14186.977..14287.068 rows=315635 loops=1)"

"        Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sq.v"

"        Sort Key: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10"

"        Sort Method:  quicksort  Memory: 79808kB"

"        Buffers: shared hit=9763"

"        ->  Hash Join  (cost=87341.48..95808.08 rows=1 width=142) (actual time=6000.728..12037.492 rows=315635 loops=1)"

"              Output: sq.tag, sq.instrument, s.d1, s.d2, s.d3, s.d4, s.d5, s.d6, s.d7, s.d8, s.d9, s.d10, sq.v"

"              Hash Cond: (s.scenarioid = sq.scenarioid)"

"              Buffers: shared hit=9763"

 

 

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| John W. Strange | Vice President | Global Commodities Technology
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