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From Ondrej Ivanič <>
Subject Re: JDBC sampler very slow
Date Fri, 08 Oct 2010 04:38:10 GMT

I do not care about network perforce in this test because I want to
test database server as is. Using JDBC sampler I can't fetch more than
100 rows. I think i'll just write simple PHP script which executes all
that queries using 'ab' (Apache HTTP server benchmarking tool) and
OpenOffice to get some reliable results and fancy charts :)

On Thu, Oct 7, 2010 at 6:22 PM, Felix Frank <> wrote:
>> Part of the database benchark (Postgres 8.4, recent JDBC4 Postgresql
>> Driver) is query which fetches 1000 recent events (row size is ~1k so
>> 1mb of data in total):
>> select * from event order by datetime desc limit 1000
>> When query is executed using JDBC sampler it takes between 2 and 5
>> minutes to finish comparing to less than 50ms using psql or simple PHP
>> script. I suspec that value of JDBC fetch size parameter is set too
>> low. Is it possible to change this parameter?
>> I found the following workaround:
>> explain analyze select * from event order by datetime desc limit 1000
>> which executes query (analyze = carry out the command and show the
>> actual run times) on the server and query result is discarded. The
>> question is if test is still reliable...
> Hi,
> this question reminds me of discussions we had here about whether images
> and static content should be included in web tests or not.
> The answers were "yes", "no", "maybe" and "it depends", in no particular
> order or prioritization.

Ondrej Ivanic

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