- users-list - monetdb.org

[MonetDB-users] Download link broken?
by Guillaume Theoret 05 Oct '09

05 Oct '09

Hi, I tried to download the linux version of MonetDB/SQL on this page http://monetdb.cwi.nl/projects/monetdb//Download/ but both the lzma and bz2 links 404. I instead followed the Ubuntu instructions available here: http://monetdb.cwi.nl/downloads/Ubuntu/ and it worked fine but I thought I'd point out the above. Thanks, Guillaume

3 4

[MonetDB-users] Query time problem
by Chris Baros 05 Oct '09

05 Oct '09

Hi I am using Monetdb xquery in a Windows platform, I want to measure the timing in some queries. But every time I run a query, I see that the "Query time" increases. If I restart the server, then again at the first time the Query time is normall, and by the second and after, increases again.. Do you have any ideas whats the problem? _________________________________________________________________ Show them the way! Add maps and directions to your party invites. http://www.microsoft.com/windows/windowslive/products/events.aspx

2 2

[MonetDB-users] current_timestamp in windows is wrong
by Alex Bo. 04 Oct '09

04 Oct '09

Hi, I am running Feb09 and Aug09 on Windows. If I use CURRENT_TIMESTAMP / LOCALTIME / LOCALTIMESTAMP then I get the correct date but the time is 2 hours early. (I am running from time zone UTC +02:00) Is this a bug? -- View this message in context: http://www.nabble.com/current_timestamp-in-windows-is-wrong-tp25736255p2573… Sent from the monetdb-users mailing list archive at Nabble.com.

1 0

[MonetDB-users] Announcement: New Aug2009-SP1 bugfix release of MonetDB suite
by Sjoerd Mullender 30 Sep '09

30 Sep '09

The MonetDB team at CWI/MonetDB BV is pleased to announce the Aug2009-SP1 bug fix release of the MonetDB suite of programs. This is the first bug fix release for the Aug2009 release. More information on this release can be found at <http://monetdb.cwi.nl/projects/monetdb//Development/Releases/Aug2009/#Aug20…>. The sources and binaries are available at <http://monetdb.cwi.nl/projects/monetdb/Download/>. -- Sjoerd Mullender

2 2

[MonetDB-users] xqueries from web apps and cgi scripts: ruby mapi interface ?
by Axel Belinfante 24 Sep '09

24 Sep '09

First of all, I'm a monetdb/xquery/ruby novice. I'm trying to do xqueries from the web in two ways: from a ruby-on-rails application, and from a cgi script. For the cgi script I use (a perl wrapper around) mclient, which seems to work ok. The remainder of this mail is about the access from ruby-on-rails. For the ruby-on-rails application, I typically have to do relatively small queries. The heart of the xqueries is in xquery module files (partly 'static', partly generated 'dynamically' from user data entered in web forms) and thus the queries to be done from ruby-on-rails are rather small: import the module, and invoke the right function with some parameters. I started using xrpc. However, I'm encountering issues that might be related to the fact that xrpc uses one backend, and mclient (by default) uses another one. (Being an xquery novice) I've also encountered some differences between the xquery support by both backends. I then started looking at the mapi interface, because that would allow the use of the same backend from both webapp an cgi scripts. To my understanding there are a couple of different routes possible, and I'm not sure what would be the best way. - use the native ruby code present in the MonetDB distribution this I tried, but it seems to not fully up-to-date/working in the Aug-2009 distribution at least, I had to hack MonetDBConnection.rb to make it work - use the swig mapi wrapper (via http://rubyforge.org/projects/monetdb-ror) I did not try that yet - somehow wrap mclient (using something like fork/exec from ruby) did not try that yet, but I have been using mclient to try queries - use libmapi to build my own translation daemon/program, that is kind of like mclient but e.g. without the prompts etc, that receives/sends xqueries/responses as strings on a socket (or so), and talks mapi to the database. I did not try this; I did compile and run the sample mapi program, which could be used as a start, I guess I'm kind of looking for comments, and in particular I'm curious about the status of the native ruby code included in the distribution - I would prefer to use that, but for some of the basic things I looked at the mapi C library seems to do things in a more involved way than the ruby code, which makes me wonder. On the other hand, it seems that for xquery support the library mainly has to pass strings around - not all the complicated things that seem to be necessary for, for example, the sql support. Thanks, Axel.

2 2

[MonetDB-users] functions in group by
by mkurtulus 22 Sep '09

22 Sep '09

Hello, in our attempt to use monetdb as a backend for Mondrian, we are running into trouble with queries that Mondrian generates where functions are used in group by. eg. select substring('string',1,2) from mytable group by substring('string',1,2); Monet complains about a syntax error... On the contrary, using this syntax works: select substring('string',1,2) as col from mytable group by col; We have found a closed bug (http://sourceforge.net/tracker/index.php?func=detail&aid=946935&group_id=56…) in sourceforge that says it is not a bug, as using functions in group by is not supported in standard sql'99. We have thought of modifying Mondrian query generator to use the supported syntax... but the supported syntax is _not_ supported by Oracle ! So not supporting Oracle in favor of Monet is not (yet :) an option... Also notice that MS Sqlserver does not support aliases in group by either. Some even state that it is not standard sql... Reading the BNF was not of great help to me :-) Would you think supporting functions in group by could be done ? Mehmet -- Open WebMail Project (http://openwebmail.org)

5 7

[MonetDB-users] dump & restore errors
by Alex Bo. 21 Sep '09

21 Sep '09

Hi, I'm failing to restore a dump from Feb09 to Aug09. I get these errors continuously when I try to restore: 0 tuples !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) !current transaction is aborted (please ROLLBACK) The problem is that the error messages aren't descriptive, I can't know what's going on. Any ideas? Thanks, Alex. -- View this message in context: http://www.nabble.com/dump---restore-errors-tp25530320p25530320.html Sent from the monetdb-users mailing list archive at Nabble.com.

4 3

[MonetDB-users] Two count(*) in query with LIMIT crashes Monet
by Alex Bo. 17 Sep '09

17 Sep '09

Hi, I am running FebSP2 on Windows. The following query crashes Monet: SELECT COUNT (*) AS c1, COUNT (*) AS c2 FROM t2 limit 100 The following queries do work: 1. Same but with only 1 aggregation field: SELECT COUNT (*) AS c1 FROM t2 limit 100 2. Same but without LIMIT: SELECT COUNT (*) AS c1, COUNT (*) AS c2 FROM t2 This seems like a bug. Thanks, Alex. -- View this message in context: http://www.nabble.com/Two-count%28*%29-in-query-with-LIMIT-crashes-Monet-tp… Sent from the monetdb-users mailing list archive at Nabble.com.

2 2

[MonetDB-users] Aug2009 - ubuntu/out of memory
by dariuszs 15 Sep '09

15 Sep '09

Hi, I've installed the Aug2009 release on Ubuntu 64bit and it brings my system to a halt - 'out of memory', every time I try to load file into a table? Previous releases work fine. Dariusz.

2 3

[MonetDB-users] server crashes (may2009-sp2)
by Lazaros Koromilas 11 Sep '09

11 Sep '09

the scenario is: - create a large document with xmlgen: http://www.ins.cwi.nl/projects/xmark/Assets/unix.c - load it _updatable_ into monetdb/xquery - query many times with the current setup, it always segfaults the server at the 4th attempt. re-produce with: # xmlgen -f 1 > xmlgen-f1.xml -rw-r--r-- 112M 2009-09-11 18:24 xmlgen-f1.xml # echo 'pf:add-doc("'$PWD'/xmlgen-f1.xml", "xmlgen-f1", "xmlac", 10)' \ | mclient -lx # echo 'doc("xmlgen-f1")//africa//item' | mclient -lx > /dev/null # echo 'doc("xmlgen-f1")//africa//item' | mclient -lx > /dev/null # echo 'doc("xmlgen-f1")//africa//item' | mclient -lx > /dev/null # echo 'doc("xmlgen-f1")//africa//item' | mclient -lx > /dev/null MAPI = monetdb@localhost:50000 ACTION= read_line QUERY = doc("xmlgen-f1")//africa//item ERROR = Connection terminated other info: # uname -a Linux redrawn 2.6.30-ARCH #1 SMP PREEMPT Wed Sep 9 12:37:32 UTC 2009 i686 Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz GenuineIntel GNU/Linux # Mserver --version MonetDB server v4.30.4 (32-bit), based on kernel v1.30.4 (32-bit oids) Copyright (c) 1993-July 2008 CWI Copyright (c) August 2008-2009 MonetDB B.V., all rights reserved Visit http://monetdb.cwi.nl/ for further information Configured for prefix: /usr/local Libraries: libpcre: 7.9 2009-04-11 (compiled with 7.9) openssl: OpenSSL 0.9.8k 25 Mar 2009 (compiled with OpenSSL 0.9.8k 25 Mar 2009) Compiled by: root@redrawn Compilation: gcc -O2 Linking : /usr/bin/ld i'll try the latest stable also. i think there was no problem with august2008 release. any help is appreciated. thanx, lazaros. -- http://www.ics.forth.gr/~koromil

1 0