April 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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Copy a set database files and register on another database
by Murthy, Gautham 24 Apr '18

24 Apr '18

Hello, On MonetDB, Can we list the files for a schema and copy the files and register to another database ? We would want to know if we can - List the files for a specific table or a schema(all tables under a schema)? Copy the files to target database and register them on the other database Thank You,

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MonetDB Read-Only without restarting the database
by Murthy, Gautham 24 Apr '18

24 Apr '18

Hello, This is regarding read-only mode in MonetDB. Can we mark the database read-only without restarting the database ? If Yes, How do we do it ? What are the options available to copy a database without restarting to another node or DB Farm? Msqldump the export and import is serialized, How do I increase the performance of exp/imp? Thank You, Gautham

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mclient backward compatibility
by Roberto Cornacchia 18 Apr '18

18 Apr '18

mclient Mar2018 is not really compatible with mserver5 Jul2017. Not a real issue for me, but I'm just curious: is mclient supposed to be compatible with an earlier release of mserver5 (at least the previous release)? $ mclient x -u monetdb password: Welcome to mclient, the MonetDB/SQL interactive terminal (Mar2018) Database: MonetDB v11.27.14 (unreleased), 'mapi:monetdb:// photon.hq.spinque.com:55500/x' Type \q to quit, \? for a list of available commands auto commit mode: on sql>-- \d silently fails (nothing dumped) sql>\d sql> sql>-- \d on a table doesn't find table comments (introduced in Mar2018) sql>\d tables SELECT: no such table 'comments' Shouldn't queries that rely on the system catalog be defined server-side?

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double precision IS NULL does not work ?
by Nicolas Paris 16 Apr '18

16 Apr '18

Hello I have those DOUBLE PRECISION fields, sometimes containing null values: sql>select count(1), range_low from omop.measurement group by range_low; +-----------+--------------------------+ | L2 | range_low | +===========+==========================+ | 304875924 | null | | 9448250 | 50 | | 16519843 | 0 | | 13198932 | 10 | | 14364002 | 20 | | 3964808 | 30 | | 2998528 | 3 | | 855829 | 2 | +-----------+--------------------------+ 8 tuples However, I am not able to filter based on is null: sql>select count(1) from omop.measurement where range_low is null; +------+ | L3 | +======+ | 0 | +------+ 1 tuple I am not able to understand if this behavior is normal regarding the documentation: "The types REAL, FLOAT and DOUBLE map to the underlying implementation system. No special attention is given to the value NaN." Thanks

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mserver5 process consuming resources while not busy
by Nicolas Paris 15 Apr '18

15 Apr '18

Hello Sorry, I gave up digging in the mailing list because didn't found search functionality there ( https://www.monetdb.org/pipermail/users-list/ ) Then I wonder why I get that result when running "top" command on my server: > PID UTIL. PR NI VIRT RES SHR S %CPU %MEM TEMPS+ COM. > 3297 monetdb 20 0 53,007g 9,028g 8,396g S 100,5 28,8 117:20.95 mserver5 There is no query running AFAIK (select * from sys.queue is empty). I loaded my database several hours before from scratch, and then ran some sql. How can I figure out what appends in the background ? Is it indexing based on queries I made ? Apparently the disk is stable, by mean there is no creation of new indexes, or files under the hood. Any insight welcome, Thanks,

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