November 2018 - users-list

[MonetDB-users] Books CDs
by CHARTS LICENSING 11 Aug '24

11 Aug '24

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Multi-column update based on joined table
by Lee Hachadoorian 11 Aug '24

11 Aug '24

I need to update multiple columns (~250) from one table to another based on a two-column key. In Postgres I would write this using the FROM clause, but since MonetDB doesn't support the FROM clause, I've successfully updated one column with: UPDATE census.acs2010_5yr SET b07401001 = ( SELECT CAST(b07401001 AS int) FROM acs2010_5yr.tmp_seq0001 WHERE acs2010_5yr.stusab = tmp_seq0001.stusab AND acs2010_5yr.logrecno = tmp_seq0001.logrecno ); My question is whether there is any benefit to writing a multiple column update into a single UPDATE statement: UPDATE target_table SET column1 = (SELECT column1 FROM source_table WHERE target_table.key = source_table.key), column2 = (SELECT column2 FROM source_table WHERE target_table.key = source_table.key), ..., columnN = (SELECT columnN FROM source_table WHERE target_table.key = source_table.key); On Postgres I believe the multi-column update using a table join would only have to do the sequential scan of each table once, but with the necessity of sub-selects in MonetDB, what is the backend doing? Is it already doing an index scan once for each row in the single column case, then doing it once for each row * column in the multi-column case? Best, --Lee -- Lee Hachadoorian Asst Professor of Geography, Dartmouth College http://freecity.commons.gc.cuny.edu/

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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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GDK reported error. MT_mremap: mremap failed. !OS: Cannot allocate memory
by RanchoYuan 04 Jul '19

04 Jul '19

Hi Stefan, Thanks for your reply! We have run the query a few times with different size of data. There we used 16G RAM(actually 13.5G was used), and find the size of 10G's data is the critical point that can run the query. All of the data files' size are listed below, each file name is a table name(there are only a few tables are refered -- store_sales, date_dim, item, customer, catalog_sales, web_sales): 7.4K call_center.dat 1.6M catalog_page.dat 212M catalog_returns.dat 2.9G catalog_sales.dat 27M customer_address.dat 64M customer.dat 77M customer_demographics.dat 9.9M date_dim.dat 77B dbgen_version.dat 149K household_demographics.dat 328B income_band.dat 2.6G inventory.dat 28M item.dat 61K promotion.dat 1.7K reason.dat 1.1K ship_mode.dat 27K store.dat 323M store_returns.dat 3.8G store_sales.dat 4.9M time_dim.dat 1.2K warehouse.dat 19K web_page.dat 98M web_returns.dat 1.5G web_sales.dat 12K web_site.dat So we guess that the monetdb has no memory management? For the output of `mserver5 --version` is: MonetDB 5 server v11.27.13 "Jul2017-SP4" (64-bit, 128-bit integers) Copyright (c) 1993 - July 2008 CWI Copyright (c) August 2008 - 2018 MonetDB B.V., all rights reserved Visit https://www.monetdb.org/ for further information Found 17.0GiB available memory, 40 available cpu cores Libraries: libpcre: 8.38 2015-11-23 (compiled with 8.38) openssl: OpenSSL 1.0.2g 1 Mar 2016 (compiled with OpenSSL 1.0.2g 1 Mar 2016) libxml2: 2.9.3 (compiled with 2.9.3) Compiled by: monetdb(a)MonetDB-0.0 (x86_64-pc-linux-gnu) Compilation: gcc -g -O2 Linking : /usr/bin/ld -m elf_x86_64 And the size of processes is not limited. To let you reproduce the problem conveniently, I'll provide more details here: you can get tpc-ds from its website(we use version 2.6.0). Install the tpc-ds, access the directory v2.6.0/tools and run `./dsdgen -scale 10 -dir /home/monetdb/tpc-ds_test_data10G` to generate the data. When data has been generated, using the script /expe.sh/ to create tables and load the data. The query script is 123.tpcds.23.sql.(The syntaxs of other queries that tpc-ds generates is not suitable for monetdb all, we don't modify them all when the problem occurred). One more question, I can't get your reply email, so I don't know how to reply you, for this case, I could only send a new mail echo time. Thanks! Regards, Rancho

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grafana-monetdb-datasource installation problem
by Ariel Abadi 01 Dec '18

01 Dec '18

Does anybody has installed the monetdb datasource plugin for Grafana? Im running Grafana v5.3.4. The plugin was downloaded from https://github.com/MonetDBSolutions/grafana-monetdb-datasource And is not working... :'( Does anybody knows how to connect MonetDB within Grafana? Any ideas will be very much appreciated!!! Thks Ariel

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Re: Issues trying to create a table...
by Stefan Manegold 28 Nov '18

28 Nov '18

Hi, Internally (as in in the MonetDB code base),the impact of the problem could imho be significantly reduced (though not fully avoided)by "simply" using different separator characters (or even strings?) when creating qnames,e.g. schema:table;column insteadof schema_table_column ... A unique bijective reversible mapping from schema,table,column to qname should avoid the problem entirely , but might require to use separator chracter(s) that are not valid in SQL identifiers, if such exist ... Best,Stefan -------- Original message --------From: Ying Zhang <Y.Zhang(a)cwi.nl> Date: 28/11/2018 07:33 (GMT+01:00) To: Communication channel for MonetDB users <users-list(a)monetdb.org> Subject: Re: Issues trying to create a table... > On 28 Nov 2018, at 04:18, Herman Knief <hknief(a)gmail.com> wrote: > > Hi Folks, > I'm new to MonetDB and trying to setup a schema from a MariaDB export. > I have a particular table that reports a conflict with the create statement. I've stripped this down to just a particular field that seems to be causing the issue, but unsure where to go from here. > > sql>CREATE TABLE "sc_cat_item_delivery_plan" ("script" string); > CREATE TABLE: zboot_sc_cat_item_delivery_plan_script conflicts Hai Herman, This is because something has already been defined before, whose complete qname is “zboot_sc_cat_item_delivery_plan_script”. This often happens with (but probably not limited to) schema_name+table_name+column_name. In MonetDB test suite, we have two examples to trigger this (type of) error: sql>create table foo (id integer, bar_id integer); operation successful sql>create table foo_bar (id integer); CREATE TABLE: sys_foo_bar_id conflicts and sql>create table foo_bar (baz int); operation successful sql>create table foo (bar_baz int); CREATE TABLE: sys_foo_bar_baz conflicts This is not a bug. You need to change your table and/or column definitions, like your alternatives below. Then CREATE TABLE will succeed. Regards, Jennie > > What's interesting is that either changing the name of the table or the name of the field and these statements work. There is something about this particular combo that is problematic. > sql>CREATE TABLE "sc_cat_item_delivery_plan1" ("script" string); > operation successful > sql>CREATE TABLE "sc_cat_item_delivery_plan" ("script1" string); > operation successful > > I have a total of 2251 tables... all were created except for this one. I've tried to destroy and recreate the schema with no luck. Logs don't seem to indicate any issue and trying to use the debug on the client didn't get me anywhere. Thoughts? Suggestions? > > -- > Please excuse typos... I can't type. > _______________________________________________ > users-list mailing list > users-list(a)monetdb.org > https://www.monetdb.org/mailman/listinfo/users-list _______________________________________________ users-list mailing list users-list(a)monetdb.org https://www.monetdb.org/mailman/listinfo/users-list

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Issues trying to create a table...
by Herman Knief 28 Nov '18

28 Nov '18

Hi Folks, I'm new to MonetDB and trying to setup a schema from a MariaDB export. I have a particular table that reports a conflict with the create statement. I've stripped this down to just a particular field that seems to be causing the issue, but unsure where to go from here. sql>CREATE TABLE "sc_cat_item_delivery_plan" ("script" string); CREATE TABLE: zboot_sc_cat_item_delivery_plan_script conflicts What's interesting is that either changing the name of the table or the name of the field and these statements work. There is something about this particular combo that is problematic. sql>CREATE TABLE "sc_cat_item_delivery_plan1" ("script" string); operation successful sql>CREATE TABLE "sc_cat_item_delivery_plan" ("script1" string); operation successful I have a total of 2251 tables... all were created except for this one. I've tried to destroy and recreate the schema with no luck. Logs don't seem to indicate any issue and trying to use the debug on the client didn't get me anywhere. Thoughts? Suggestions? -- Please excuse typos... I can't type.

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Issue while connecting to MonetDB via Perl cpan driver
by Sharma, Sreejith 15 Nov '18

15 Nov '18

Hi, We have a Perl code via which we are trying to connect to one of the MonetDB instance. Here we are using DBD::monetdb Perl cpan driver for connectivity. when we run the snippet, it just tries to connect to DB and seems hung, looks like it's awaiting for user input for password. Also, on the server side logs we see an error (challenge error) can connection will not be established. Here is a sample snippet which isn't working. Could anyone help with an idea or code snippet which works with Perl DBI for MonetDB connectivity? [cid:image001.png@01D47D35.C23AD040] #!/usr/bin/perl # use strict; use warnings; use DBI(); print "Attempting to connect...\n"; my $dbh = DBI->connect('dbi:monetdb:host=XXXX;port=55555', 'USERNAME', 'Password', { RaiseError => 1 } ); print "Connected. Trying SQL...\n"; my $sth = $dbh->prepare('SELECT * FROM env'); $sth->execute; $sth->dump_results; print "Done\n"; exit 0; Regards, Sreejith

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Error: cannot bind delete column
by Doherty, Adam 15 Nov '18

15 Nov '18

Hello all: I have run across a show-stopping error, "cannot bind delete column" which renders Monet unusable until I restart the service. A batch import of events runs every 10 minutes and has been unable to complete for the last 28 hours because the service is not accepting commands. I'm not sure where to look for the source of this error. Restarting the service correct the issue, but this is a problem as the Monet instance drives live Tableau dashboards using this imported data. Where do I need to start looking to track down the source of this error? I am currently running 11.29.3 on CentOS 7. Adam

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