December 2010 - 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] Add primary key performance
by paulr135 13 Jan '11

13 Jan '11

I've loaded a 27GB (~165M rows) file into a table in MonetDB and now I am trying to add a primary key which consists of 4 fields - 2 varchars and 2 ints. It has been running for a few days (since Friday of last week). I've followed the instructions laid out on this post: http://old.nabble.com/MonetDB-SQL:-bulk-loading-large-data-sets---adding-ke… which involves setting the optimizer variable to "nov2009_pipe". I am unable to log in via mclient - I am able to put in my credentials but it just hangs at the "Welcome to mclient, the MonetDB/SQL interactive terminal (Jun2010-SP2)" line. So I have a few questions: 1. Is there any way I can see the status of the alter table ... add primary key command? 2. Is it possible to stop the alter table gracefully? Or will I have to shut the db down? 3. Is there anything I should do in future to speed up adding of primary keys? Thanks. -- View this message in context: http://old.nabble.com/Add-primary-key-performance-tp30397515p30397515.html Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Monnetdb/Xquery
by Ramachandran, Prakash 30 Dec '10

30 Dec '10

Hi, I am currently evaluating software's for metadata storage that can be used in our product. I came across your product and found it very interesting and we might consider using it for our metadata storage. I just wanted to know if Monnetdb provides commercial support, if so can you please provide the detail on sales contacts. Thank in advance. Regards, Prakash R

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[MonetDB-users] MAPI interface error
by Brett Spurrier 24 Dec '10

24 Dec '10

Hi all, I am having a bit of trouble and I am hoping a seasoned MonetDB expert can lend some advice. I am using the MAPI interface in my C/C++ application to talk to my MonetDB instance. I have a recursive INSERT INTO statement which populates the database, and it initially works pretty well. However, as I populate more (past 200 inserts in my case), I get a MAPI error (exampled by: mapi_explain_result()): MAPI = monetdb@localhost:50000 ACTION= mapi_start_talking ERROR = !Connection terminated No real reason as to why. Has anyone seen this before? My code: MapiHdl query(Mapi dbh, char *q) { MapiHdl ret = NULL; if ((ret = mapi_query(dbh, q)) == NULL || mapi_error(dbh) != MOK) die(dbh, ret); return(ret); } void update(Mapi dbh, char *q) { MapiHdl ret = query(dbh, q); if (mapi_close_handle(ret) != MOK) die(dbh, ret); } void main() { dbh = mapi_connect("localhost", 50000, "monetdb", "monetdb", "sql", "dbname"); if (mapi_error(dbh)) { die(dbh, hdl); } for (int i=0; i< 2500; i++) { char *p = INSERT_INTO_STATEMENT; update(dbh, p); } } Does anyone see any reason that the MAPI would choke mid way through the For loop? Any help would be majorly appreciated. I am at a loss. Cheers, Brett

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[MonetDB-users] Announcement: New Jun2010-SP1 bugfix release of MonetDB suite
by Sjoerd Mullender 21 Dec '10

21 Dec '10

The MonetDB team at CWI/MonetDB BV is pleased to announce the Oct2010-SP1 bug fix release of the MonetDB suite of programs. The most important and visible change is a security fix in the SQL COPY INTO command. This is detailed in the release notes. More information (including release notes) on this release is available at <http://monetdb.cwi.nl/Development/Releases/Oct2010/>. The download location is <http://dev.monetdb.org/downloads/>. -- Sjoerd Mullender

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[MonetDB-users] How to limit monetdb memory consumption on Windows
by Bianco Prieto-Ilarion 18 Dec '10

18 Dec '10

Hi all! I have a problem. I'm using Oct2010 64-bit MonetDB build. I have a table with 8M records and when I'm trying to execute LEFT JOIN (from JDBC) MonetDB is crashed. I can see that it crashed due to memory (my laptop has 8Gb) consumption is unlimited. What can you suggest (just use Linux is a final step:)) Thanks, Bina Prieto

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[MonetDB-users] MonetDB Installation
by Rob Fynes 16 Dec '10

16 Dec '10

Hello, Regarding the pre-compiled binaries directories for deb distributions "karmic" and "lucid" in the downloads section, there doesn't appear to be anything for x-query. Is this intentional? Regards, -Rob

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[MonetDB-users] mserver5 ignores ulimit?
by Siva Manoharan 14 Dec '10

14 Dec '10

Hi. I am currently running monetdb (release Oct2010) on Debian etch, with 8GB physical RAM and 10GB virutal memory. During unrestricted operation (using the merovingian daemon) monetdb takes up a significant majority of the resources, which is not desirable as there are other processes running on the same server. To limit the memory, I tried using ulimit (setting -d, -v and -m all to 2GB). According to the logs, merovingian notices the limit (a line from log states "Found 1.907 GiB available main-memory"). However, memory usage of mserver still exceeds that limit and is killed off by the OS, abandoning an ongoing query. (merovingian is not killed and mserver restarts without any problems). Is this expected behaviour or is it a bug? Is there another way to limit monetdb's memory usage? As a note, none of the tables (and therefore none of the columns) are anywhere near 2GB in size. The biggest table has ~2.5M rows, where each row has 2 columns ( 8byte bigint and 4 byte int). However, there are thousands of tables, and mserver exceeds the limit most often when a large number of tables are being updated within a short time (in a single php process, however). Is it possible that mserver doesn't release memory fast enough to allow multiple tables to be accessed? Thanks.

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