October 2023 - 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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Announcement: New Jun2023-SP2 Bugfix release of MonetDB suite
by Sjoerd Mullender 03 Oct '23

03 Oct '23

The MonetDB team at MonetDB Solutions BV is pleased to announce the Jun2023-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/release-notes/jun2023/>. As usual, the download location is <https://www.monetdb.org/downloads/>. ### - Fixed an installation issue on Debian and Ubuntu introduced in the last build. - Do a lot more error checking, mostly for allocation failures. More is still needed, though. - Improve performance of the ILIKE operator when the pattern contains only ASCII characters. In this case we do not need to treat any characters as UTF-8 and we can use much faster routines that perform byte comparisons. ### MonetDB Common - Fixed a number of data races (race conditions). - Fixed a reference counting problem when a BAT could nog be loaded, e.g. because of resource limitations. - Only check for virtual memory limits when creating or growing bats, not for general memory allocations. There is (still) too much code that doesn't properly handle failing allocations, so we need to avoid those as much as possible. This has mostly an effect if there are virtual memory size restrictions imposed by cgroups (memory.swap.max in cgroups v2, memory.memsw.limit_in_bytes in cgroups v1). - The low-level commit turned out to always commit every persistent bat in the system. There is no need for that, it should only commit bats that were changed. This has now been fixed. - Implemented timeout/exit checks in a bunch more operators. Long(er) running operators occasionally check whether they're taking too long (past a user-specified timeout) or whether the server is exiting. This is now done in more places. ### Bug Fixes - [7094](https://github.com/MonetDB/MonetDB/issues/7094): Drop remote tables in transactions and rollback - [7303](https://github.com/MonetDB/MonetDB/issues/7303): Improve the performance of multi-column filters - [7400](https://github.com/MonetDB/MonetDB/issues/7400): VM max memory is not check correctly for cgroups v2 - [7401](https://github.com/MonetDB/MonetDB/issues/7401): Column aliases used incorrectly in UNION subqueries - [7402](https://github.com/MonetDB/MonetDB/issues/7402): Privileges on merge table not propagated to partition tables

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