May 2009 - users-list

[MonetDB-users] Books CDs
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11 Aug '24

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[MonetDB-users] XQuery API and XLink/XUpdate support
by Alexandra Mart�nez 27 Jun '24

27 Jun '24

Hello all, I was wondering if there is any documentation about the API for XQuery (i.e., how to write xqueries from a Java program). Also, I am interested in using some features of XLink and XUpdate on top of my XML database. Is support for any of these in progress? Thanks in advance, Alexandra ______________________________________________________ Click here to donate to the Hurricane Katrina relief effort. http://store.yahoo.com/redcross-donate3/

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[MonetDB-users] Proofreading your professional documents
by Richard Hounslow 24 Feb '24

24 Feb '24

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[MonetDB-users] Possible wrong results when Querying
by LeonardF 10 Nov '09

10 Nov '09

Hi There, I have some problem with the row_number() over() function. Consider the following table: create table "table1" ("customer" varchar(40), "product" varchar(40), "price" double) insert into "table1" values ('cust1', 'p1', 100) insert into "table1" values ('cust1', 'p2', 200) insert into "table1" values ('cust1', 'p3', 150) insert into "table1" values ('cust2', 'p1', 300) insert into "table1" values ('cust2', 'p3', 200) The following query over this table: SELECT "customer", "product", "sumprice", (Row_number() OVER(PARTITION BY "customer" ORDER BY "sumprice")) as "rank" FROM ( SELECT "customer", "product", (Sum("price")) AS "sumprice" FROM "table1" GROUP BY "customer", "product") AS "temp" Returns: Customer product sumprice rank Cust1 p1 100 1 Cust1 p2 200 2 Cust1 p3 150 3 Cust2 p1 300 1 Cust2 p3 200 2 But doesn’t it suppose to return the following result set?: Customer product sumprice rank Cust1 p1 100 1 Cust1 p3 150 2 Cust1 p2 200 3 Cust2 p3 200 1 Cust2 p1 200 2 Thanks -- Leonard Forgge -- View this message in context: http://www.nabble.com/Possible-wrong-results-when-Querying-tp22821802p22821… Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Best way to lookup a varchar field?
by Henri Asseily 04 Jun '09

04 Jun '09

Hi, I've got a very simple table structure in SQL, with a non-unique varchar field and a few other fields including a CLOB. I found that it's abnormally slow to filter the varchar field with an 'IN' statement and simply return the CLOB. i.e.: select clob from x where varchar in ('a','b','c') With a couple million rows, the query is in multiple seconds if the results are around a couple thousand rows. Is there something I'm doing wrong? I should be just the varchar BAT filter, then join on the CLOB BAT. Should I manually assign the varchars to integers in another table and use ints on this table? That would be surprising... Thanks. H

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[MonetDB-users] Memory Allocation errors
by Rob Wickert 04 Jun '09

04 Jun '09

Hi all, I've been testing MonetDB and I've been getting strange memory allocation errors while running large 'group by' queries. From a dataset of around 60GB, I'm running 'group by' queries against it to test for speed. Queries of the sort: select keyword, count(*) as c from raw_data group by keyword order by c desc limit 100; What's happening is that it will trundle along ok for a while, generally consuming all the available memory (98%) on 3GB box. But after a while I get these messages on the server: # Listening for connection requests on mapi:monetdb://127.0.0.1:50000/ # MonetDB/SQL module v2.28.4 loaded >#GDKmmap(10412883968) fails, try to free up space [memory in use=72431192,virtual memory in use=71134150656] #GDKmmap(10412883968) result [mem=71387384,vm=71134150656] #GDKvmalloc(10412883984) fails, try to free up space [memory in use=71386904,virtual memory in use=71134150656] #GDKvmalloc(10412883984) result [mem=71130480,vm=71134150656] !ERROR: HEAPalloc: Insufficient space for HEAP of 10412883968 bytes. Also while checking top it will reports a much large RES size than physical memory. E.g. (250% for %MEM). I haven't changed any out of the box settings. Is there a minimum memory size that MonetDB requires to play nice? Is there anywhere I can go to limit the amount of memory MonetDB requires? The version I'm using is: mserver5 --version MonetDB server v5.10.4 (64-bit), based on kernel v1.28.4 (64-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 Libraries: libpcre: 6.6 06-Feb-2006 (compiled with 6.6) openssl: OpenSSL 0.9.8e-rhel5 01 Jul 2008 (compiled with OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008) libxml2: 2.6.26 (compiled with 2.6.26) Compiled by: mockbuild(a)surya.karan.org Compilation: gcc -O2 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -std=c99 -O6 -fomit-frame-pointer -finline-functions -falign-loops=4 -falign-jumps=4 -falign-functions=4 -fexpensive-optimizations -funroll-loops -frerun-cse-after-loop -frerun-loop-opt -ftree-vectorize Linking : ld -IPA -m elf_x86_64 Cheers

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[MonetDB-users] LIKE queries failing
by Rob Wickert 04 Jun '09

04 Jun '09

Hi all, I'm having problems with MonetDB5 while performing LIKE queries against it. Normal queries work fine, but anything with a LIKE in it gets this response: sql> select * from raw_data where keyword like 'apple%' limit 1; !MALException:batcalc.str:can not create bat 0 tuples Any ideas? This is the version of mserver5 I'm using: MonetDB server v5.10.4 (64-bit), based on kernel v1.28.4 (64-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 Libraries: libpcre: 6.6 06-Feb-2006 (compiled with 6.6) openssl: OpenSSL 0.9.8e-rhel5 01 Jul 2008 (compiled with OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008) libxml2: 2.6.26 (compiled with 2.6.26) Compiled by: mockbuild(a)surya.karan.org Compilation: gcc -O2 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -std=c99 -O6 -fomit-frame-pointer -finline-functions -falign-loops=4 -falign-jumps=4 -falign-functions=4 -fexpensive-optimizations -funroll-loops -frerun-cse-after-loop -frerun-loop-opt -ftree-vectorize Linking : ld -IPA -m elf_x86_64 Cheers

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[MonetDB-users] problems with starting the monetDB4 xquery server
by Mtekel 31 May '09

31 May '09

Hello, I have problems starting the monetDB xquery server under windowsXP sp3. When I click on the link in the start menu, dos window appears but then it closes immediatelly and I can't see what's there (after pausing I can see only the first 6 lines of the program output as described below, then after unpausing it immediatelly quits and closes the window). If I run MXQserver.bat, or Mserver.bat --dbinit="module(pathfinder);" I get only this: # MonetDB Server v4.28.4 # based on GDK v1.28.4 # Copyright (c) 1993-July 2008, CWI. All rights reserved. # Copyright (c) August 2008-2009, MonetDB B.V.. All rights reserved. # Compiled for i686-pc-win32/32bit with 32bit OIDs; dynamically linked. # Visit http://monetdb.cwi.nl/ for further information. # PF/Tijah module v0.9.0 loaded. http://dbappl.cs.utwente.nl/pftijah That's all. The server immediatelly ends. However If I run only Mserver.bat, the server "runs" - I get the prompt, but for example I can't connect to the web interface on the port 50000. Does anyone have any advice what to do? How to make it work? Any advice appreciated, Best regards Michael

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[MonetDB-users] Python Library Problems
by Scott Stephens 31 May '09

31 May '09

I'm having problems connecting to a MonetDB 5 SQL database via the Python interface. I am working on a Mac OS X (10.5.6) system, with python 2.5.1. I downloaded and compiled the Feb 2009 SP2 release from source and added the appropriate directory to my PYTHONPATH. When running the connect command, I get some errors: >>> import MonetSQLdb >>> x = MonetSQLdb.connect(host='greensburg.local',user='scott',password='notmyrealpassword',lang='sql',dbname='HistoricalData') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "MonetSQLdb/__init__.py", line 131, in __init__ self._mapi = Mapi(kwargs['host'], kwargs['port'], kwargs['user'], kwargs['password'], kwargs['lang'], kwargs['dbname']) File "MonetDB/CMapi.py", line 30, in __init__ raise IOError(self.error_str()) IOError: !InvalidCredentialsException:checkCredentials:Invalid credentials for user 'scott' I have checked and double checked that my user name and password are correct: I am able to login to the database from the same machine using SQL Explorer in Eclipse with the same credentials. The connection shows up in the merovingian log on the server as being proxied to the appropriate databse. The weird thing is, it doesn't show the connection ending until I quit() the python interactive session, or try connecting again, or do something else with the connection object (c = x.cursor() also causes a disconnect, and thows an exception that complains that x is not defined). Ideas anyone? The only thing I can think of that may be wrong is I'm not using the same releases of MonetDB for the python library and the server. mserver5 --version says I'm running MonetDB server v5.6.0 based on kernel v1.24.0 (I can't seem to remember/figure out which named release this corresponds to). Do the versions need to be the same? Thanks, Scott

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[MonetDB-users] Re cycler optimizer in May2009 branch?
by Alex Bo. 31 May '09

31 May '09

Hi, Will the recycler optimizer be part of the next release? Is it enabled in the May2009 branch? Thanks. -- View this message in context: http://www.nabble.com/Recycler-optimizer-in-May2009-branch--tp23801028p2380… Sent from the monetdb-users mailing list archive at Nabble.com.

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