January 2013 - 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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Dynamic where clause in a stored procedure
by Vassilis Papakonstantinou 31 Jan '13

31 Jan '13

Hi all, Is it possible in monetdb to use a dynamic where clause in a selection query inside a stored procedure? More specifically, i want to pass the clause as parameter. Thank you, Vassilis

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[help] I have a simple question about monetdb query plan.
by 이수호 31 Jan '13

31 Jan '13

p{margin:0;padding:0;} Hello, I'm a student of Korea Advanced Institute of Science and Technology in Korea. I want to compare late materialization with join and invisible join on monetdb. But when i typed SQL query, i couldn't choose which query plan to use. There was no choice to me. I think query optimizer choose some join method. Can I choose join method? or control query plan? I installed Monetdb on my desk-top and followed tutorials. Everything is done. There is no error. In this situation, i tried to control query plan. So I read reference on official homepage. But I couldn't find the information that how to control query plan. Can I control query plan? If I can, I really really want to know how do that. Where can i find some example? Please give me your favor.

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caught SIGTERM, starting shutdown sequence
by Tapomay Dey 29 Jan '13

29 Jan '13

MSG merovingian[32005]: caught SIGTERM, starting shutdown sequence 2013-01-29 11:40:53 MSG control[32005]: control channel closed 2013-01-29 11:41:06 MSG merovingian[32005]: caught SIGTERM, starting shutdown sequence 2013-01-29 11:41:40 MSG merovingian[32005]: caught SIGTERM, starting shutdown sequence 2013-01-29 11:41:51 MSG merovingian[32005]: caught SIGTERM, starting shutdown sequence Every time I do a monetdbd stop {path_to_farm} I keep getting this in merovingian logs. But the monetdbd process never ends. This issue was not there on the same installation of monetdb initially. This problem started occurring annoyingly frequently after I renamed my last farm and created a fresh one.(with monetdbd not running) What leads me to stop the farm is that I am unable to connect to the db using mclient(There's another app accessing the DB using JDBC-c3p0). There's is no complaint in the merovingian log. The mclient command just hangs. I get back access once I force kill the monetdbd using kill -9. But it gets back into this state after some time. Running on Feb13 branch some older revision. Ubuntu 12.10 with lots of resources. Is this a known issue. Is there a workaround/config or something.

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best way to get autogenerated primary key
by Mate Birkas 29 Jan '13

29 Jan '13

Hi, this is my first post to this list, so forgive me if this is not the right place to post this. I tried to do my research (google, monetdb.org, python api help) but didn't find an answer. How can I get the auto-generated primary key (integer) after executing an insert. I want to use it in a second insert to another table that references the first. (in PostgreSQL I used the RETURNING clause for this) thanks in advance Mate

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MonetDB crash / termination issue.
by Brian Hood 29 Jan '13

29 Jan '13

Hi All, I'm not quite sure if i'm doing something wrong here but what is see if i performing a 2 table join on a primary key field is tablea and tableb work fine yet tablec which has less data crashes the daemon. SELECT a.ip_dst as ip_dst, b.tcp_dport as tcp_dport, count(*) as num from "myschema".tablea a LEFT JOIN "myschema".tableb b ON (a.guid = b.guid) WHERE b.tcp_dport IS NOT NULL GROUP BY a.ip_dst, b.tcp_dport ORDER BY num DESC LIMIT 20; This one works fine. However when i perform the join from tablea to tablec I get the following. sql>SELECT a.ip_dst as ip_dst, b.udp_dport as udp_dport, count(*) as num from "myschema".tablea a LEFT JOIN "myschema".tablec b ON (a.guid = b.guid) WHERE b.udp_dport IS NOT NULL GROUP BY a.ip_dst, b.udp_dport ORDER BY num DESC LIMIT 20 more>; Connection terminated I've added alot more detail to the pastebin link. I had the same issue with 11.13.5 after upgrading i have run into the same thing also. http://pastebin.com/m4XseSnH If you want to schema information to reproduce please just email me off list. Regards, Brian Hood

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Strange concurrency issue
by Percy Wegmann 28 Jan '13

28 Jan '13

Dear MonetDB Team, We're starting to exercise our MonetDB installation more heavily now and I've run into a strange issue where I get an occasional "COMMIT: failed" message. It seems that the conditions required to produce this are: - Concurrently inserting into two different tables - At the same time, issuing a SELECT COUNT(*) against either of those tables I've logged a bug with more detailed information, including a Java test case: http://bugs.monetdb.org/show_bug.cgi?id=3210 I'm only just starting my investigation, but I suspect that COUNT(*) may be the culprit, since other selects like SELECT * don't seem to have this problem. Does this ring any bells? Are there any special optimizations for COUNT(*) that bypass the underlying BAT and/or have side effects on some shared table somewhere that could be causing a concurrency violation? Thanks, -- Percy Wegmann +1 512 637 8500 ext 148 _______________________________________________ users-list mailing list users-list(a)monetdb.org http://mail.monetdb.org/mailman/listinfo/users-list

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Bit functions (XOR and inverse)
by Eduardo Oliveira 28 Jan '13

28 Jan '13

Hi, I'm running MonetDB v11.13.9 (Oct2012-SP3), i have some doubts about bit functions, i was trying the bit functions looking at MySQL docs in MonetDB: http://dev.mysql.com/doc/refman/5.0/en/bit-functions.html And when i used ^, the pow was calculated instead of XOR, the ~ don't work as expected too. I google and I found this http://permalink.gmane.org/gmane.comp.db.monetdb.scm/28212 This patch will be applied on MonetDb, any date of release of MonetDb with ^ already as XOR? Right now what operator should i used to make a xor? I tested xor XOR and MonetDb didn't recognize. If i want to insert in binary form how i do? b'binary' works? Thanks in advance, -- *Eduardo Oliveira * *IT* ***Email:* eduardo.oliveira(a)adclick.pt *Web: *www.adclickint.com **<http://www.adclickint.com/> * * <http://www.adclickint.com/> <http://www.adclickint.com/>

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