I have try the redirecting ,but it also have more time,and contain the
write file time.I just only want to know the time of actual execution
time.what do i do?
In monetdb homepape,i see your benchmarks,and I want to know how did you
test the time?
在 2010年7月15日 下午9:30，kun ren <renkun.n...@gmail.com>写道：
> Thank you，Stefan Manegold.I will try. I want to go to CWI to study database
> .CWI is a very excellent research institutions.
> Best regards!
>
> 2010/7/15 Stefan Manegold <stefan.maneg...@cwi.nl>
>
> On Thu, Jul 15, 2010 at 04:45:25PM +0800, kun ren wrote:
>> > Dear everyone,
>> > Recently,i am testing the performance of MonetDB. But I want to know
>> the
>> > time of execution one sql. I type \t on CLI. and then it returns a
>> > execution time. But I found that the time include the print resultset
>> time.I
>> > just only want to know the time of execution ,not include the print
>> time. So
>> > please tell me what do i do?
>>
>> If "print time" refers to actually echoing the result to a terminal,
>> then simply redirect your output to a file (or even /de/null, after you
>> have verified thet your query indeed produced the correct output),
>> either by using "\>" in mclient, or by redirecting alll mclient output
>> using
>> ">" in the command line.
>>
>> If "print time" (also) refers to serialization of the result table,
>> then store the result into a table, e.g.,
>>
>> create table result as ( <your query> ) with data;
>>
>> If "print time" (also) refers ot actual materialization of the result
>> table,
>> then only get the size (rowcount) of the result table, e.g.,
>>
>> select count(*) from ( <your query> ) as result;
>>
>> Hope this helps you further.
>>
>> Stefan
>>
>> > -----------------Best regards!
>>
>> >
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>>
>> --
>> | Dr. Stefan Manegold | mailto:stefan.maneg...@cwi.nl |
>> | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ |
>> | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 |
>> | The Netherlands | Fax : +31 (20) 592-4199 |
>>
>
>
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