December 2015 - users-list

Extract Table Statistics after Data import using Monet.Read.Csv
by Jigar Shah 29 Dec '15

29 Dec '15

Hello, I am trying to import a very large dataset of approx.. 170 million records. The dataset is divided into have 12 tables of approx. 2 GB each. In order to recreate the entire dataset, I want to use the MERGE function to merge all the 12 tables into one dataset for further analysis. However, when I try to add the table to merge table, it gives an error of type mismatch in columns. Can you please help me how to determine the column type after a ‘csv’ file has been imported using monet.red.csv ? I would like to use the same R interface to MonetDB as I am still learning MonetDB and not conversant with the DB. Thanks & Regards, Jigar Shah Sent from Mail for Windows 10

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am i doing something stupid, or should i file a bug report? this seems absurd :) thanks
by Anthony Damico 18 Dec '15

18 Dec '15

sql>create table my_table as select 1 with data; operation successful (57.729ms) sql>alter table my_table set read only; operation successful (5.488ms) sql>alter table my_table add column my_column integer; operation successful (10.563ms) sql>drop table my_table; operation successful (6.075ms) sql>

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Examples for lag and lead functions in monetdb
by Ashish Kumar Singh 15 Dec '15

15 Dec '15

Did anyone got lead and lag functions working with monetdb? Any test case , examples will be appreciated. Sent from Nine<http://www.9folders.com/>

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very low insertion speed
by poornima＠apakau.com 15 Dec '15

15 Dec '15

Hi, Is there something that I need to configure. I am inserting to a local database to a table with only one covered index. I am using jdbc to write. I am getting only 30-35 insertions/sec even on a new table. This seems very low. Am I missing something ? Regards, Poornima.

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Problem with case when else statement and casting
by John Utke 09 Dec '15

09 Dec '15

Hello, I am having an issue with MonetDB Oct 2014-SP2., though I believe it's also an issue with Jul2015-SP1. The issue happens when using a select case, the items in the when statement are validated even when the statement will never execute. This will cause issues with casting, that otherwise should never have executed. For example, this sample code: select case when false = true then cast('a' as int) else 'b' end Results in the error: Error: conversion of string 'a' to type int failed. SQLState: 22018 ErrorCode: 0 Even though the when statement should never be true and it shouldn't matter if it can't cast 'a' to an int. While the similar query: select case when false = true then 'a' else 'b' end Will always result in 'b', as expected. It is almost as if the query is not short circuiting correctly and checks every statement of the when statement. I was previously on release Jan-2014 SP1 and I did not have this issue. Has anybody else seen something like this? Is there a setting somewhere to turn off this when check? Apologies if this is a common/simple question, I am relatively new to MonetDB. Thank you, John

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Re: users-list Digest, Vol 40, Issue 1
by Luciano Sasso 01 Dec '15

01 Dec '15

Hi, abou driver jdbc 2.18, error in insert data type numeric, any idea ? Att, On 01/12/2015 09:00, users-list-request(a)monetdb.org wrote: > Send users-list mailing list submissions to > users-list(a)monetdb.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.monetdb.org/mailman/listinfo/users-list > or, via email, send a message with subject or body 'help' to > users-list-request(a)monetdb.org > > You can reach the person managing the list at > users-list-owner(a)monetdb.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of users-list digest..." > > > Today's Topics: > > 1. Re: Double insert (Stefan Manegold) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 30 Nov 2015 15:46:53 +0100 (CET) > From: Stefan Manegold <Stefan.Manegold(a)cwi.nl> > To: Communication channel for MonetDB users <users-list(a)monetdb.org> > Subject: Re: Double insert > Message-ID: <652294476.3054123.1448894813168.JavaMail.zimbra(a)cwi.nl> > Content-Type: text/plain; charset=utf-8 > > Dear S?bastien & Mathieu, > > in MonetDB, for numerical types, the NULL value is the smallest value of the type's domain; > see also > https://www.monetdb.org/Documentation/Manuals/SQLreference/BuiltinTypes > > Best, > Stefan > > ----- On Nov 30, 2015, at 3:13 PM, S?bastien RAILLARD (PASSMAN) sebastien.raillard(a)passman.fr wrote: > >> Dear Mark, >> >> We are doing some integrity checks over the data loaded in MonetDB, we would >> like to know how the values can be correctly loaded. >> We have tested many cases (like min/max) for the different types, that why we >> have found this behavior. >> In practice, we will not need to insert the -1.7976931348623157e308 value! >> But it should be great if the documentation can stat which values are reserved >> for NULL storage. >> >> Best regards, >> Sebastien >> >> >> From: users-list >> [mailto:users-list-bounces+sebastien.raillard=passman.fr@monetdb.org] On Behalf >> Of Mark Raasveldt >> Sent: vendredi 27 novembre 2015 17:02 >> To: Communication channel for MonetDB users >> Subject: Re: Double insert >> >> Hey Mathieu, >> This is not actually a bug, but a feature :) >> MonetDB encodes null values of numeric columns by a specific value. This is >> typically the lowest possible value in that column, or close to the lowest >> possible value for that column. For doubles, the null value is encoded as >> -1.7976931348623157e308, thus if you insert this value into the database it >> will be interpreted as null. >> >> Is there any specific reason you need this value in the database? >> Regards, >> Mark >> >> On Fri, Nov 27, 2015 at 4:37 PM, Mathieu Raillard <mraillard(a)data-mat.fr> wrote: >> Hi all, >> >> We found a strange case this week when testing some insert. >> >> We tried to insert -1.7976931348623157e308 in a double value and we get a null >> in the column. >> >> Data to reproduce the case : >> >> create table test.testdouble >> ( >> id int, >> testdouble double, >> primary key (id) >> ) >> >> insert into test.testdouble (id,testdouble) values (1, -1.7976931348623157e308) >> >> select * from test.testdouble >> >> Regards >> >> Mathieu >> >> _______________________________________________ >> users-list mailing list >> users-list(a)monetdb.org >> https://www.monetdb.org/mailman/listinfo/users-list >> >> >> >> -- >> >> >> Parc d'activit? Tolsto? >> 4 rue Edouard Aynard >> 69100 Villeurbanne >> T?l. +33 (0)4 78 95 05 80 >> Fax +33 (0)4 78 95 00 17 >> >> www.passman.fr >> www.passman-hotels.com >> www.passman-camping.com >> www.passman-sante.com >> <https://www.facebook.com/PASSMAN-187787814053/> >> _______________________________________________ >> users-list mailing list >> users-list(a)monetdb.org >> https://www.monetdb.org/mailman/listinfo/users-list -- Luciano Sasso Vieira Data Scientist & Solutions Architect luciano(a)gsgroup.com.br <http://www.gsgroup.com.br> | tel: 17 3353-0833 | cel: 17 99706-9335 www.gsgroup.com.br <http://www.gsgroup.com.br> --- Este email foi escaneado pelo Avast antivírus. https://www.avast.com/antivirus

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