Message-ID: <3DF71684.5080208@msys.ch>
Date: Wed, 11 Dec 2002 11:42:12 +0100
From: Beatrice Yueksel <beatrice@msys.ch>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US;
	rv:0.9.4) Gecko/20011022 Netscape6/6.2
MIME-Version: 1.0
To: pgsql-sql@postgresql.org
Subject: Problem with timestamp 
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8bit

Hello,

I try to check the time needed by a function.
I would like to :
 . select current_timestamp,
 . execute 5000 times a function
 . select the current_timestamp and return the interval.
Problem : the interval is always '00:00', the two timestamps have always 
the same value.
Could you help me ? have you any suggestions for testing sql functions 
speed?
Thank you in advance,
Béatrice


create function test_function() returns interval
as '
declare
    j integer;
    t1 timestamp;
    t2 timestamp;
    t3 interval;
    x integer;
begin
    select into t1 now();
    FOR j in 0..5000 loop
        select into x get_function_to_test();
    end loop;
    select into t2 now();
    t3 := t2 - t1;
    RAISE NOTICE '' from % to % = %'',t2,t1,t3;
    return t3;

end;
' language 'plpgsql';