| From: | "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com> |
|---|---|
| To: | Hannu Krosing <hannu(at)skype(dot)net> |
| Cc: | uwcssa <uwcssa(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: suppress output for benchmarking |
| Date: | 2006-01-19 21:48:28 |
| Message-ID: | 20060119214828.GE78403@pervasive.com |
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| Lists: | pgsql-hackers |
On Thu, Jan 19, 2006 at 11:46:29PM +0200, Hannu Krosing wrote:
> ??hel kenal p??eval, K, 2006-01-18 kell 22:35, kirjutas uwcssa:
> > I am testing the performance of postgresql on a set of workloads.
> > However,
> > the output significantly affects the performance evaluation. Is there
> > a way
> > to by-pass all output of select statements so the timing reflects only
> > the
> > query evaluation process?
>
> If you do EXPLAIN ANALYSE QUERY instead of just QUERY, then the backend
> discards all rows returned and just gives back performance data
The flipside is that EXPLAIN ANALYZE adds it's own (non-trivial)
overhead to the query.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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