September 2014 - users-list

[MonetDB-users] Proofreading your professional documents
by Richard Hounslow 24 Feb '24

24 Feb '24

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Can not drop the view
by Radovan Bičiště 06 Oct '14

06 Oct '14

Hello, I'm wondering if there is some hard core way to drop a view. Somehow I have three views that I'm not able to drop. I can issue drop statement several times and it returns success. Here is log from mclient: ceos@lux-drmax-ana:/u01/ceosdata/database/monetdb/drmax/crm$ mclient -d zkdev1 -u drmaxtst password: Welcome to mclient, the MonetDB/SQL interactive terminal (Jan2014-SP2) Database: MonetDB v11.17.17 (Jan2014-SP2), 'mapi:monetdb://lux-drmax-ana:50000/zkdev1' Type \q to quit, \? for a list of available commands auto commit mode: on sql>\dv VIEW drmaxtst.all_constraints VIEW drmaxtst.all_tab_columns VIEW drmaxtst.mmtest_v VIEW drmaxtst.pohyby_prodeje_v VIEW drmaxtst.prijmy_2012_v_mr_tmp VIEW drmaxtst.prijmy_v VIEW drmaxtst.prodeje_2011_v VIEW drmaxtst.prodeje_2012_v VIEW drmaxtst.prodeje_2012_v_mr_tmp VIEW drmaxtst.prodeje_2013_v VIEW drmaxtst.prodeje_2014_v VIEW drmaxtst.prodeje_v VIEW drmaxtst.stav_skladu_historie sql>drop view drmaxtst.prodeje_v; operation successful (3.168ms) sql>drop view drmaxtst.prodeje_v; operation successful (3.004ms) sql>drop view drmaxtst.prodeje_v; operation successful (7.501ms) sql>drop view drmaxtst.prodeje_v; operation successful (4.154ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.351ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.410ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.355ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.685ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.646ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.695ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.390ms) sql>drop view drmaxtst.prodeje_v; operation successful (2.399ms) sql>drop view drmaxtst.prodeje_v; DROP VIEW: unknown view 'prodeje_v' sql>drop view drmaxtst.prodeje_v; DROP VIEW: unknown view 'prodeje_v' sql>\dv VIEW drmaxtst.all_constraints VIEW drmaxtst.all_tab_columns VIEW drmaxtst.mmtest_v VIEW drmaxtst.pohyby_prodeje_v VIEW drmaxtst.prijmy_2012_v_mr_tmp VIEW drmaxtst.prijmy_v VIEW drmaxtst.prodeje_2011_v VIEW drmaxtst.prodeje_2012_v VIEW drmaxtst.prodeje_2012_v_mr_tmp VIEW drmaxtst.prodeje_2013_v VIEW drmaxtst.prodeje_2014_v VIEW drmaxtst.prodeje_v VIEW drmaxtst.stav_skladu_historie sql> I guess my only option is to dump a reload the database. :( Radovan

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why is my SAMPLE percentage limiter throwing an error?
by Anthony Damico 30 Sep '14

30 Sep '14

sorry if this is a silly question.. i'm trying to sample a percentage of a table. from https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/Sampling it looks like these should work, but i must be making a mistake in my syntax somewhere? thanks!! create table test ( a int , b double precision ); insert into test values( 1 , 3.3 ); insert into test values( 13 , 2.3 ); insert into test values( 3 , 0.3 ); select * from test sample 0.1 ; TypeException:user.s12_1[9]:'sample.subuniform' undefined in: _18:any := sample. subuniform(_15:bat[:oid,:int], _16:dbl) program contains errors select * from test uniform sample 0.1 ; TypeException:user.s13_1[9]:'sample.subuniform' undefined in: _18:any := sample. subuniform(_15:bat[:oid,:int], _16:dbl) program contains errors # MonetDB 5 server v11.17.21 "Jan2014-SP3" # Serving database 'demo', using 8 threads # Compiled for x86_64-pc-winnt/64bit with 64bit OIDs dynamically linked # Found 7.860 GiB available main-memory. # Copyright (c) 1993-July 2008 CWI. # Copyright (c) August 2008-2014 MonetDB B.V., all rights reserved # Visit http://www.monetdb.org/ for further information # Listening for connection requests on mapi:monetdb://127.0.0.1:50000/ # MonetDB/JAQL module loaded # MonetDB/SQL module loaded >

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MEDIAN ???
by Budulinku Dejmihrasku 26 Sep '14

26 Sep '14

Hi, just a quick question regarding to MEDIAN: with x as (select 1.0 as a union all select 2.0 as a) select sys.median(a) as result from x returns result=1 i would expect result=1.5 though any suggestion? thanks milan

4 7

Show create table equivalent
by Guillaume Bassot 23 Sep '14

23 Sep '14

Hello everyone, I'm looking for the mysql show create table equivalent. I need this as a query to get the result in a php script. (I already found how to do this with mclient and msqldumq) I found this query that need to be parsed to recreate the "CREATE TABLE". SELECT * FROM SYS.tables tbl INNER JOIN SYS.columns col ON (tbl.id=col.table_id) WHERE tbl.name='exemple'; But i still miss the table's constraints (primary key, unique key) Could you tell me where to find this information ? Thank you for helping. Guillaume BASSOT Web Developer +33 (0)1 55 48 02 82 gbassot(a)inbox.fr 30, rue Vincent Moris 92240 Malakoff - France Fax : +33 (0)1 55 48 02 79

4 3

table size
by Christian Braun 22 Sep '14

22 Sep '14

Hello, i want to know how much disk space each table uses. How can i find out to which table each of the files in the database directory belong? Thanks in advance, Christian

2 1

Crashing when querying on date column
by Nick Chadwick 18 Sep '14

18 Sep '14

Hi. I'm currently evaluating MonetDB for an upcoming project, and am having some problems when using date criteria in the where clause. I have a very simple table: Create table negs (id varchar(50) not null, xdate date not null, market int, product int, notional double) Id and xdate form a composite primary key, and I have indices on xdate, market and product. If I run the following query: Select * from negs where xdate = current_date the client crashes. Similarly if I run the same query over a JDBC connection from java, the connection is lost. Looking in the log file, it says that the database was killed due to a SIGSEGV. Am I doing something wrong? I am running on Ubuntu 14.04, and built MonetDB from the latest source tarball, 11.17.21. Thanks, Nick www.digiterre.com _________________ Privileged or confidential information may be contained in this message. If you are not the addressee of this message please notify the sender by return and thereafter delete the message, and you may not use, copy, disclose or rely on the information contained in it. Internet e-mail may be susceptible to data corruption, interception and unauthorised amendment for which Digiterre does not accept liability. Whilst we have taken reasonable precautions to ensure that this e-mail and any attachments have been swept for viruses, Digiterre does not accept liability for any damage sustained as a result of viruses. Statements in this message that do not relate to the business of Digiterre are neither given nor endorsed by the company or its directors.

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MonetDB Optimizer
by Steffen B 15 Sep '14

15 Sep '14

Hello, I'm writing a back end for Database Supported Haskell (DSH) to target MonetDB. Can I please get some help with running my generated MAL-code though an optimizer? I do not really understand the concept behind this: https://www.monetdb.org/Documentation/Manuals/MonetDB/Optimizers Do I have to generate optimizer code at the appropriate places in my code? Are the optimizer instructions woven into the MAL-Program? Isn't there a optimizer function `a la: optimize :: MalCode -> MalCode? Please be so kind and give me a little bit of futher explaination.

2 1

index on Monetdb
by Bing Zhang 11 Sep '14

11 Sep '14

Hello: I wonder whether the index will give monetdb query more performance or not. For example, like tpc-h queries, if I put index on the particular fields, then the query on over those fields will faster? Thanks & Regards.

2 2

monetdb performance Time measurement
by Bing Zhang 11 Sep '14

11 Sep '14

hi: I am trying to measure query performance of monetdb, but not sure about the time output by using option -ims includes the query results printing time, or it is just the query time. Is there some way to silence the output of queries? Thanks.

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