December 2007 - users-list

[MonetDB-users] JDBC driver, where? (sorry)
by Martin Koch 05 Dec '07

05 Dec '07

Dear Reader, I compiled a Mars-Superball-SR4 and a SR5. Both apperently succesfull, as I have sql functionality. But in neiter I found a /share/MonetDB/ lib/ directory containing the promised JDBC driver. What am I doing wrong? I use a standard Ubuntu Gutsy 32 bit, with sun JRE 5.0 (but not the JDK) to run SQuirreL SQL Thanks for your attention and for your software, Kind regards, Martin

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[MonetDB-users] update query performance
by Lange Marcus 05 Dec '07

05 Dec '07

Hello, I have a question. I have a table with the columns ( id, name (string), num(int) ). In this table I have lets say 100 rows of data. In a Java app. I am updating the different rows individually with the sql command: "UPDATE "tableName" SET "num" = ('99') WHERE "id" = (5);" The time to run this single query is between 15 to 32 milliseconds, except every once in a while when it can be as much as 110 milliseconds. Since I want to do this several times each second for all rows this is way to long time. Am I doing something wrong, or am I using Monet in a way that it is not meant to be used or what ? Is there another way to solve this (Updating individual cells/variables in individual rows FAST) ? Thanks for any input! Regards, Marcus

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[MonetDB-users] inserting into default schema?
by m h 05 Dec '07

05 Dec '07

If I create a table, by default it goes into the "tmp" schema. But when I try to create a "users" table, it complains, since there is one in the "sys" schema. Why doesn't it create one in the "tmp" schema? ie: CREATE TABLE users (fcol FLOAT(25)); !CREATE TABLE: name 'users' already in use Just wondering about the resolution order. thanks -matt

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[MonetDB-users] Optimal hardware/software configuration?
by m h 04 Dec '07

04 Dec '07

Say one wanted to do some benchmarks for Monetdb. Here would be a few questions: * Does Raid 0+1 help more than RAM? * What about multi cores? Are they currently useful? * Are big processor caches useful? * What about 64 bit linux? Does that help or hurt? Or here's another way to put it. If you had between $2-$5K to spend what hardware would you buy? A bunch of PS3's ;) Any input would be great? thanks matt

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[MonetDB-users] converting strings to dates?
by m h 04 Dec '07

04 Dec '07

In Oracle I can do the following: select * from table where timestampcol BETWEEN to_date('01/01/07', 'MM/DD/RR') AND to_date('12/31'/07'), 'MM/DD/RR') It's not clear that this is possible in monetdb. There's the EXTRACT function which pulls a numeric value (month, day or year) from a string representing a timestamp, but I can't see how to get a timestamp/date object out? -matt

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[MonetDB-users] Portuguese Characters
by Paulo Jorge Dias 04 Dec '07

04 Dec '07

Hi, I am trying to insert data which has Portuguese Characters and I get some errors. Using the copy command: sql>copy into d_concelho from '/monetdb5/bo/dados/d_concelho.txt' delimiters '|'; !SQLException:sql:value ALTER DO CH├O|12|20071202 from line 23 not inserted !SQLException:importTable:failed to import table Using a java program with jdbc: D:\MonetDB5>java Concelho java.sql.SQLException: unexpected end of input at nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.executeQuery(MonetConnection.java:2048) at nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.processQuery(MonetConnection.java:1798) at nl.cwi.monetdb.jdbc.MonetStatement.internalExecute(MonetStatement.java:371) at nl.cwi.monetdb.jdbc.MonetStatement.execute(MonetStatement.java:340) at nl.cwi.monetdb.jdbc.MonetPreparedStatement.execute(MonetPreparedStatement.java:209) at Concelho.main(Concelho.java:25) Is there any way to get this running? Thanks very much, Paulo Jorge Dias -- View this message in context: http://www.nabble.com/Portuguese-Characters-tf4938671.html#a14136589 Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Question about used Encoding
by Markus Gritsch 04 Dec '07

04 Dec '07

Hi, I would like to know how encoding related issues are handles in MonetDB. For example, when I run the following Python script # -*- coding: utf-8 -*- import MonetSQLdb x = MonetSQLdb.connect(host = 'localhost', user = 'voc', password = 'voc', lang = 'sql') c = x.cursor() c.execute('DROP TABLE test') c.execute('CREATE TABLE test(id int, name varchar(20))') c.execute('INSERT INTO test (id, name) VALUES (%s, %s)', (0, 'ä ö ü')) c.close() x.close() and then look at the inserted data using DbVisualizer I get Ã¤ Ã¶ Ã¼ in the 'name' column. When I try to edit the value in the DbVisualizer, I get an error message "unexpected end of input". (The SQL statements reads update voc.test set name = 'ö' where id = 0). Is this a JDBC driver problem? When I connect to an MySQL database with the MySQL JDBC driver included in DbVisualizer I can insert arbitrary characters, and they get properly displayed in the GUI. Kind regards, Markus

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[MonetDB-users] primary key retrieval
by Lange Marcus 04 Dec '07

04 Dec '07

Hello, How do I retrieve the primary key id value after inserting something new into the database ? I am writing a simple Java app. (using JDBC) and would like to get this info back into my program. Thanks for any help! Regards Marcus

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[MonetDB-users] windows 127.0.0.1
by Miki Muzsi 04 Dec '07

04 Dec '07

Hi there, Anybody knows if the installation of Monet can be changed (on windows) to use localhost instead of 127.0.0.1. It seems that because of that I can not connect to MondetDB from a different machine; I get the error message: Could not open connection to the host, on port 50000: Connect failed. I've lokked into monetdb5.conf, registriey, docs ... nothing helpt. BTW I am using version v5.2.2 on windows. Cheers, Miki Chordiant Software International Ltd. Registered office: Chiswick Park Building 10, 566 Chiswick High Road, London W4 5XS Registered in UK no. 02155722 and VAT no. GB 479 9023 02 The information transmitted herewith is sensitive information of Chordiant Software or its customers and is intended only for use to the individual or entity to which it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying or other use of, or taking of any action in reliance upon, this information is strictly prohibited. If you have received this communication in error, please contact the sender and delete the material from your computer.

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[MonetDB-users] offset support?
by m h 04 Dec '07

04 Dec '07

Is there support for OFFSET in queries? The syntax doesn't throw an error, but the expected behavior isn't correct... sql>select * from query_users; +---------+----------+ |user_id |user_name | +=========+==========+ | 1 |john | | 2 |jack | | 3 |ed | | 4 |wendy | | 5 |laura | | 6 |ralph | | 7 |fido | +---------+----------+ Timer 1.820 msec 7 rows sql> Timer 0.294 msec 0 rows sql>SELECT query_users.user_id, query_users.user_name more>FROM query_users ORDER BY query_users.user_id more> LIMIT 3 OFFSET 2; +---------+----------+ |user_id |user_name | +=========+==========+ | 1 |john | | 2 |jack | | 3 |ed | +---------+----------+ -matt

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