Dear all,
for the "XQuery Implementation Paradigms" workshop at Dagstuhl (Nov. 19-22)
(cf., http://www.dagstuhl.de/programm/kalender/semhp/?semnr=06472),
we're looking for XQuery 'Hard Nuts to Crack' (see below for details).
Hence, if you have encountered any such 'Hard Nuts' --- with MonetDB/XQuery
or elsewhere ---, please let us now "ASAP", at least before Nov 19.
Please accompany our Hard Nuts with a brief statement what makes the Nut
hard.
Thank you very much in advance!
Stefan
========
*** XQuery 'Hard Nuts to Crack'
Most of us have stumbled across a certain XQuery expression or construct
that performs (un)expectedly bad or exposes a subtlety of the language
specification. We want to employ such 'XQuery Hard Nuts to Crack'
during the seminar to identify interesting, yet dark, corners of the
language and its implementation.
We would like to ask you to contribute your tough queries to the
seminar.
To clarify, an XQuery Hard Nut is
- a specific query expression that is supposedly tricky or hard to
evaluate (maybe when applied to a specific XML instance), or
- a specific XQuery or XQuery Update construct (or combination of
constructs) that is hard to support in general.
A good XQuery Hard Nut is compact, precise, and to the point.
We'll try to have the Hard Nuts cracked by the participants of the
"XQuery Implementation Paradigms" workshop (resp. their XQuery systems),
and let you know about the results.
We imagine that here and there some Hard Nut aspect might also make a
valuable contribution for a forthcoming definition of a new XQuery
benchmark that we plan to tackle during the workshop.
========
--
| Dr. Stefan Manegold | mailto:Stefan.Manegold@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) 592-4312 |
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Hi,
I am using Microsoft ActiveX Dataobject (ADO) to write my records to the MonetDB database. I am inserting records row by row (running it out of VB environment):
set cnnMONETDB = new ADODB.Connection
for i = 0 to rownum
createsql = "INSERT INTO tablename (columnnames) VALUES (values);"
cnnMONETDB.Execute createsql
next i
It takes me about 5min to insert 100000 rows into the database, which is too slow for my purpose. Is there any way to speed this up? I was reading that monetdb can update 100000r records per second. i must be doing something wrong then :(
Thanks and regards
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yes, ADO is an object model that connects through ODBC. Via ADO, autocommit is turned off by default and each SQL statement has to be embedded in following code:
ADOConnObj.BeginTrans
ADOConnObj.Execute sqlstatement
ADOConnObj.CommitTrans
can you tell me what programming platform is best supported by MonetDB in order to avoid these problems and be able to write data quick to the database.
Can you as well tell me how many records per second can be written into and read from MonetDB (if everything is done correctly;))
regards
*Von:* monetdb-users(a)lists.sourceforge.net
*Gesendet:* 26.10.06 10:41:04
*An:* monetdb-users(a)lists.sourceforge.net
*Betreff:* Re: [MonetDB-users] writing to MonetDB via ADO
On 26-10-2006 10:37:37 +0200, Branislav Djokovic wrote:
> Thanks for the answer. I have tried to switch off autocommit within
> ADO but it gives me an error message when i try to commit a command.
> Can it be that it does not support it through ADO?
I am not aware that we have an ADO driver. Does it work through the
ODBC driver? If so, I would expect auto-commit flagging to work. How
did you switch auto-commit off? Maybe the ODBC driver doesn't support
it (yet).
-------------------------------------------------------------------------
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Thanks for the answer. I have tried to switch off autocommit within ADO but it gives me an error message when i try to commit a command. Can it be that it does not support it through ADO?
regards
*Von:* monetdb-users(a)lists.sourceforge.net
*Gesendet:* 26.10.06 09:31:09
*An:* monetdb-users(a)lists.sourceforge.net
*Betreff:* Re: [MonetDB-users] writing to MonetDB via ADO
Hi,
Thanks for using MonetDB/SQL. I'm not too familiar with visual basic,
but I assume your "(columnnames)" and "(values)" are filled in with
actual values by your application. Hence, looking at what you give us,
I suspect that you didn't switch off auto-commmit mode. Doing so will
improve performance (sometimes dramatically). An even higher speed can
be achieved when using an COPY INTO construct, but this is harder to
deal with from an application environment like you seem to be in.
Regards
On 26-10-2006 09:26:15 +0200, baane(a)web.de wrote:
>
>
> Hi,
>
> I am using Microsoft ActiveX Dataobject (ADO) to write my records to the MonetDB database. I am inserting records row by row (running it out of VB environment):
>
> set cnnMONETDB = new ADODB.Connection
>
> for i = 0 to rownum
>
> createsql = "INSERT INTO tablename (columnnames) VALUES (values);"
>
> cnnMONETDB.Execute createsql
>
> next i
>
> It takes me about 5min to insert 100000 rows into the database, which is too slow for my purpose. Is there any way to speed this up? I was reading that monetdb can update 100000r records per second. i must be doing something wrong then :(
>
> Thanks and regards
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
MonetDB-users mailing list
MonetDB-users(a)lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/monetdb-users
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