February 2008 - users-list

[MonetDB-users] Books CDs
by CHARTS LICENSING 11 Aug '24

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] (no subject)
by Matt Magoffin 11 Aug '08

11 Aug '08

Hello, I am interested in evaluating MonetDB/XQuery. I have some XML collections for a project I work on that are of 1-2 million individual XML documents for which I use XQuery to access for OLAP style reporting operations. This is a Java-based project, and while working on this project I developed a thin XQuery-centric API so that I could evaluate/use many different XQuery implementations, which my company released as an open source project called Xaj (http://sourceforge.net/projects/xaj) Currently I am using a Berkeley DB XML implementation, but am interested in exploring other options. I'd like to implement a MonetDB version of this API now, but I am having some difficulty finding out how to effectively access MonetDB through Java. So far I was able to use the MonetDB JDBC driver to construct XQuery statements and get XML results, and also I was able to construct MonetDB pf:add-doc() statements to add documents, but I am wondering if this is the best approach (and if so, how to add documents to a remote MonetDB server using the pf:add-doc() mechanism). The API I am trying to implement you can view here, to give you an idea what I'm trying to do: http://xaj.svn.sourceforge.net/viewvc/xaj/xaj/src/net/sf/xaj/XmlDb.java?rev… It was somewhat modeled after the defunct XML:DB API, but focused just on add/store/XQuery operations. Any help/advise would be greatly appreciated! -- m@

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[MonetDB-users] db log shrink
by Colin Foss 17 Apr '08

17 Apr '08

Is there any method, besides restarting the database, of shrinking the sql log file? When I am performing a large set of large inserts (via COPY INTO) the log file gets very large. I wish there was a way to cycle the log file. Also during these large batches of inserts the database server becomes less and less responsive until I am forced to restart the server. Upon restart and the normal recovery monet returns to a very responsive state.

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[MonetDB-users] JDBC insert performance
by chinarinde 11 Mar '08

11 Mar '08

Hi all, I am new to monetDB and ran into the following problem (I'll try to be as verbose as I can, perhaps it helps helping me): I've installed MonetDB server 5.0.0, clients and commons 1.18.2 and sql 2.18.2 on Ubuntu Feisty. Then I've taken the JDBC example which is available online and modified it to be able to insert data into a test database. More specifically I'm using prepared statements and executeBatch() together with the monetdb-1.6 JDBC driver. Which is quite successful until about 5 million records are inserted - afterwards the speed of the inserts drops dramatically. I've experimented with different batch sizes (10000 records seems to work ok), and I've tried to understand the chapter about memory tuning for MonetDB (not sure yet about how to use mem_cursize() though). In any case at first inserting 2 million records only takes about 5 minutes (measured with Javas System.timemillis), later on this time increases and the server gets rather unresponsive. I found only two posts concerning the speed of JDBC inserts (from January 2007 I think) and I would be interested if a solution or explanation has been found off-list. Thank you -- View this message in context: http://www.nabble.com/JDBC-insert-performance-tf4589411.html#a13100422 Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Windows binary + Python2.4
by Pawel Lewicki 26 Feb '08

26 Feb '08

Hi, Is there any chance for Python extensions compiled for Python 2.4 for Windows? Paweł Lewicki

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[MonetDB-users] Blacklisting certain XML elements
by jz＠uva 26 Feb '08

26 Feb '08

Dear all, I am wondering whether it is possible with MonetDB4/XQuery, PF/Tijah, to blacklist certain XML element names from being "shredded", and thus being indexed? If so, could someone tell me how? I hope this is the correct mailinglist for asking this question... Best, Junte

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Re: [MonetDB-users] COPY TO corrupting data
by mobigital-nbl＠yahoo.com 26 Feb '08

26 Feb '08

Stefan Manegold wrote: > 32-bit system on 8 GB machines does not make much sense, does it? > A 32-bit systems can (at least per process) address at most 4 GB, usually > only 2 GB in practice... True, but doesn't seem like I am hitting the maximum process memory limit (not even approaching 1.5GB). > With 9M+ records of >= 438 byte each, your data is >=3.9 GB in size. > I'm not completely sure whether MonetDB temprarily need to hold all data > concurrently in its address sapce during bulk loading; but if so, your data > size might simply exceed the 32-bit address space. > (Obviously, MonetDB should better give an error than crash ...) I am bulk loading only 250K rows at a time, at which point they are copied from staging table into permament final table. am I allowed to have a table with total data size larger than max process memory size? > Did you try on a 64-bit systems using 64-bit MonetDB? I have, but hitting another - higher limit - 100M rows ending with corruption on 64 bits, see first message on this thread.

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Re: [MonetDB-users] COPY TO corrupting data
by bunninge 25 Feb '08

25 Feb '08

-----Original Message----- From: Martin Kersten <Martin.Kersten(a)cwi.nl> Sent: Friday, February 22, 2008 17:07 To: Communication channel for MonetDB users <monetdb-users(a)lists.sourceforge.net> Subject: Re: [MonetDB-users] COPY TO corrupting data mobigital1 wrote: > FYI, i am using 500K rows at a time. > > I've seen the mserver5.exe process memory utilization go up to 13GB (free > memory was around 1.5 GB). > but then it winds down pretty quickly. > > > > Thanks. This means that the expected database chunk size is topped at 500K * (7 * 8+ 2*20+6 *10+15+144*8 ) bytes i.e. 500K* 1323= 0.670Gb chucksize wise there does not seem a problem. However, virtual memory footprint quickly increases and I am wondering if we hit a limit in OS regaring memory mapped files. I would check a single batch for consistency. Then built a merge table over the smaller batches. In a later stage you can then glue together the pieces until we hit another limit thanks for the info and help in improving MonetDB ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ MonetDB-users mailing list MonetDB-users(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/monetdb-users

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