February 2010 - users-list

[MonetDB-users] Different query results after each execution
by Alex Bo. 20 Feb '10

20 Feb '10

Hi, I am getting weird behavior with a query that involves a LIKE comparison: This is the query: SELECT ("test2"."a1") AS "a1", (Count(DISTINCT CASE WHEN (Lower("test2"."a2") LIKE '%aaa%') THEN "test2"."a3" ELSE NULL END)) AS "m1" FROM "test"."test2" GROUP BY "test2"."a1" Whenever I run this query I get different results in my m1 field. If I remove the LIKE then it behaves fine. I can't seem to reproduce it on new tables with little data, but with the data I have (a table with 109402 rows) it does reproduce all the time. Can I upload the dbfarm and file this as a bug? -- View this message in context: http://old.nabble.com/Different-query-results-after-each-execution-tp276669… Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Weird behaviour with namespaces in XQuery
by Ignacio Martín Oya 19 Feb '10

19 Feb '10

Hello: I'm using MonetDB for a project. I've observed some weird results when doing a XQuery on an inserted document. Steps to reproduce the bug are: xquery>pf:add-doc ('file://var/tmp/pres-rules.xml', 'pres-rules.xml', 'pres-rules', 1) more>xquery>declare namespace xs="http://www.w3.org/2001/XMLSchema"; more>declare namespace cr="urn:ietf:params:xml:ns:common-policy"; more>declare namespace pr="urn:ietf:params:xml:ns:pres-rules"; more>count (doc('pres-rules.xml')/cr:ruleset/cr:rule[@id="pres_whitelist"]/cr:conditions/cr:identity) more><?xml version="1.0" encoding="utf-8"?> <XQueryResult>0</XQueryResult> However, sometimes, if I restart the Mserver, the same query returns: more>xquery>declare namespace xs="http://www.w3.org/2001/XMLSchema"; more>declare namespace cr="urn:ietf:params:xml:ns:common-policy"; more>declare namespace pr="urn:ietf:params:xml:ns:pres-rules"; more>count (doc('pres-rules.xml')/cr:ruleset/cr:rule[@id="pres_whitelist"]/cr:conditions/cr:identity) more><?xml version="1.0" encoding="utf-8"?> <XQueryResult>1</XQueryResult> What is the expected result. I'm sure it's related with namespaces after some tests. Are you aware of this behaviour? There exists some workaround? Document to test is attached. I'm using latest version of MonetDB with XQuery support: # MonetDB Server v4.34.4 # based on GDK v1.34.4 # Copyright (c) 1993-July 2008, CWI. All rights reserved. # Copyright (c) August 2008-2009, MonetDB B.V.. All rights reserved. # Compiled for x86_64-redhat-linux-gnu/64bit with 64bit OIDs; dynamically linked. # Detected 0.979 GiB (1051709440 bytes) main-memory. # Visit http://monetdb.cwi.nl/ for further information. # PF/Tijah module v0.13.0 loaded. http://dbappl.cs.utwente.nl/pftijah # MonetDB/XQuery module v0.34.4 loaded (default back-end is 'algebra') # XRPC administrative console at http://127.0.0.1:50001/admin Cheers, Nacho. -- -- Ignacio Martín Oya Project Engineer http://www.azetti.com Important: This e-mail may contain information confidential to Azetti Networks. If you are not the intended recipient it may be unlawful for you to read, copy, distribute, disclose or otherwise use information contained in it. If this is the case, please contact us immediately and we will assist you. Tel: +34 91 658 69 53 Fax: +34 91 651 40 42 E-mail: Reply to sender

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[MonetDB-users] Monetdb + unixODBC
by Alexander Barkov 18 Feb '10

18 Feb '10

Hello, I am a new in MonetDB. I'm testing MonetDB + unixODBC with an application which inserts long BLOB values, and I'm having some problems. Can you please help me? 1. When I use rc= SQLBindParameter(hstmt, position, SQL_PARAM_INPUT, SQL_C_DEFAULT, SQL_LONGVARBINARY, 0, 0, (char*) data, data_size, &BindBuf[position].size); I get error "Optional feature is not implemented". If I change SQL_LONGVARBINARY to SQL_VARCHAR, it works, however it wants the data in HEX notation, instead of raw binary buffer. That means I need 2*data_size extra memory to encode my binary data in hex, and then send the result send to SQLBindParameter. Is there a way to bind raw binary data, to avoid hex encoding? 2. When I insert blob data using rc= SQLExecDirect(hstms, "INSERT INTO t1 (blob_column)" "VALUES " "('<long hex-string>')", SQL_NTS); It works fine for short data, but it returns this error when hex-string is long enough: [SQLSTATE:S1000][unixODBC][MonetDB][ODBC Driver 1.0]current transaction is aborted (please ROLLBACK) I guess I hit some maximum possible query length limit, or maybe maximum possible transaction size. Is there a way to configure MonetDB to allow longer values? 3. Does the native MonetDB API have the same limitations with the bind types and maximum query(or transaction) size? Thank you very much!

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[MonetDB-users] MAL BAT Types
by Gerrard_56 14 Feb '10

14 Feb '10

hi, I’m writing a theoretical paper about MonetDB and I have a question about the MAL. Does the MAL also use inverted lists and are the updated in the same way described for the MIL in the thesis of P. A. Boncz “Monet: A Next-Generation DBMS Kernel For Query-Intensive Applications” on page 137f. Thanks for any information gerrard -- View this message in context: http://old.nabble.com/MAL-BAT-Types-tp27583769p27583769.html Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Admin GUI is blank page
by jasonpriem 12 Feb '10

12 Feb '10

Hi, I've just installed MonetDB on my 32-bit Vista system. The server and client both start up fine; however, http://127.0.0.1:50001/admin gives me a blank page. I can't really think of much to try, save deactivating the firewall (which made no difference). Any suggestions? Thanks. -- View this message in context: http://old.nabble.com/Admin-GUI-is-blank-page-tp27559054p27559054.html Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Missing element names when bulkloading XML files into MonetDB
by Alexander Koglin 12 Feb '10

12 Feb '10

I have buldloaded a collection of 10.000 XML files into MonetDB like this: for $d in doc("/monetdbfiles.xml")//doc return pf:add-doc(fn:concat($d/@path,$d/@name), fn:string($d/@name), "abap10k", 0) <> Now the XML files have missing element names and look like this in MonetDB: <AST> < type="compound" line="1" id="1"> < type="stmt" line="1" id="2"/> < type="stmt" line="5" id="3"> < type="clause" line="5" id="4"> < type="idf" line="5" id="5"/> </> What could be wrong? Thanks for your help.

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[MonetDB-users] Pager in mclient?
by Mark Bucciarelli 11 Feb '10

11 Feb '10

>From man page, it looks like I should be able to pipe the output of a command through less. But I can't figure out the syntax. For example: sql>\|less \d mytable sql> Can I do this? If so, is there a way to set it up so this always happens? This is candidate release from November 2009. Thanks, Mark

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[MonetDB-users] where is the data?
by Zoltan Tomory 09 Feb '10

09 Feb '10

Curiosity has gotten the best of me. Where is the datafile/s kept and what is it called? Thanks in advance, Zoltan Tomory

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[MonetDB-users] Monetdb and Hardy Heron
by Radek Maciaszek 09 Feb '10

09 Feb '10

Hi, I noticed the release for Karmic Koala but none for Hardy Heron. Is it possible to install monetdb with hardy? Is there perhaps any wiki page in monetdb documentation which expplains steps? Looking forward to trying monetdb! Radek

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[MonetDB-users] dump and restore---use merovingian database files?
by Mark Bucciarelli 09 Feb '10

09 Feb '10

I just had to restore a database dump, and I got nervous watching top. The box, which doesn't have much RAM, started to swap on the restore. At times, the monetdb process was using over 90% of available RAM. While I only have 500M RAM, the database only has 10m records. The gzipped dump is 142MB. Other than the backup/restore issue, Monet seems quite happy running with this much data and so little RAM. It looks like it could support much more data---but I'm not so sure the restore will. If I run $ monetdb stop -a can I safely tar the database files and use that as a backup? Or do I need to stop merovingian too? Or is this approach not safe? Thanks, Mark

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