February 2020 - 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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SP2 R integration
by ALEX OSSIPOV 22 Feb '20

22 Feb '20

I am not able to get R part working in latest SP2 and getting this error: LoaderException:loadLibrary:Loading error failed to open lib rary rapi (from within file '/usr/lib64/monetdb5/lib_rapi.so'): libR.so: cannot open shared object file: No such file or directory I use Centos 7 package MonetDB-R.x86_64_11.35.15-20200217.el7 and wonder if it was build with --enable-R-shlib option. SP1 did not have this problem Thanks Alex

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Announcement: New Nov2019-SP2 Bugfix release of MonetDB suite
by Sjoerd Mullender 21 Feb '20

21 Feb '20

The MonetDB team at MonetDB BV is pleased to announce the Nov2019-SP2 bugfix release of the MonetDB suite of programs. More information about MonetDB can be found on our website at <https://www.monetdb.org/>. For details on this release, please see the release notes at <https://www.monetdb.org/Downloads/ReleaseNotes>. As usual, the download location is <https://www.monetdb.org/downloads/>. Nov 2019-SP2 bugfix release (11.35.15) Bug Fixes * 6805: Using the cascade operator in a drop table statement ends in an exit from the Monetdb shell. * 6807: Median_avg and quantile_avg ignore NULL values * 6815: query with ifthenelse() crashes mserver5 * 6816: Monetdb Crashes on INSERT statement after ALTER statement in another connection * 6817: running analyze on a schema which contains a stream table stops with an error * 6819: functions do not persist

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dropped functions
by ALEX OSSIPOV 18 Feb '20

18 Feb '20

I noticed every time Monetdb service is bounced all created functions disappear from database. Is it a bug or a way functions are handled in MonetDB? Thanks Alex.

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search links are broken
by ALEX OSSIPOV 17 Feb '20

17 Feb '20

All links in Search results point to localhost:8080 instead of site. Can it be fixed? Thanks Alex

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Include additional libraries
by Oxana Dolmatova 13 Feb '20

13 Feb '20

Hello, Could you tell what would be the easiest way to include additional libraries into the compilation process of MonetDB? More specifically I'm interested in calling MKL operations inside BAT Algebra operations. For example, mkl standalone operation of QR decomposition (in file mkl_qr.c all the additional headers are included) is compiled as follows: gcc -c mkl_qr.c gcc -o mkl_qr mkl_qr.o -L${MKLROOT}/lib/intel64 -Wl,--no-as-needed -lmkl_intel_ilp64 -lmkl_gnu_thread -lmkl_core -lgomp -lpthread -lm -ldl What would be the proper Makefile to edit and extend with additional libraries if I want to use MKL in batcalc.c, for example? Thank you and best regards, Oksana

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How can i change plan choice according new constraint
by DEMBELE Simon Pierre 10 Feb '20

10 Feb '20

hello, I want to know if it is possible to change how monetdb choose a plan by adding new contraints. -- Simon

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