December 2021 - 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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BATsetaccess() returns NULL
by Roberto Cornacchia 30 Dec '21

30 Dec '21

Hi there, I'm moving some code to Jul2021, and I got a bit stuck on this. The issue can be simplified to this (make a copy and, append another bat, and make the result read-only): bn = COLcopy(b, b->ttype, true, TRANSIENT); ret = BATappend(bn,u, s, force ? *force : false); bn = BATsetaccess(bn, BAT_READ); The only superficial difference from Oct2020 is that now BATaccess returns the modified bat instead of a gdk_return. The issue I see is that BATsetaccess() returns NULL, due to m1 == STORE_INVALID. Am I using this wrong? Any help is appreciated. Cheers, Roberto

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SELinux problems
by Arjen P. de Vries 29 Dec '21

29 Dec '21

Hi all, Not really a bug report because I did not manage to figure out the cause. However, after upgrading from FC31 to FC32 I could not login any more, due to SELinux problems. Auto-relabeling did not work, nothing really... ... until I did dnf uninstall MonetDB-selinux. I came to this point because trying to give systemd services the correct labels with restorecon failed with an error referencing a monetdb specific file. I do not have the details unfortunately, but if you get problems, beware that MonetDB SELinux package and systemd may interfere in some way beyond my knowledge of these services. Best regards, Arjen PS: Some output from logs: sudo ausearch -c monetdb -m AVC,SELINUX_ERR [..] ---- time->Sat May 2 20:57:01 2020 type=AVC msg=audit(1588445821.693:203): avc: denied { open } for pid=1232 comm="monetdbd" path="/etc/resolv.conf" dev="dm-0" ino=3409775 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:default_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.043:1194): avc: denied { execute } for pid=2861 comm="(monetdbd)" name="monetdbd" dev="dm-0" ino=2147256 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=1 trawcon="unconfined_u:object_r:monetdbd_exec_t:s0" ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.043:1195): avc: denied { execute_no_trans } for pid=2861 comm="(monetdbd)" path="/usr/bin/monetdbd" dev="dm-0" ino=2147256 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=1 trawcon="unconfined_u:object_r:monetdbd_exec_t:s0" ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.044:1196): avc: denied { map } for pid=2861 comm="monetdbd" path="/usr/bin/monetdbd" dev="dm-0" ino=2147256 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=1 trawcon="unconfined_u:object_r:monetdbd_exec_t:s0" ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.714:1197): avc: denied { remove_name } for pid=1232 comm="monetdbd" name="merovingian.pid" dev="tmpfs" ino=34369 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=dir permissive=1 trawcon="system_u:object_r:monetdbd_var_run_t:s0" ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.714:1198): avc: denied { unlink } for pid=1232 comm="monetdbd" name="merovingian.pid" dev="tmpfs" ino=34369 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:12:56 2020 type=AVC msg=audit(1588446776.714:1199): avc: denied { write } for pid=1232 comm="monetdbd" name=".merovingian_lock" dev="dm-0" ino=5899443 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=1 trawcon="system_u:object_r:monetdbd_lock_t:s0" ---- time->Sat May 2 21:13:15 2020 type=AVC msg=audit(1588446795.214:1209): avc: denied { read } for pid=2925 comm="(monetdbd)" name="passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:13:15 2020 type=AVC msg=audit(1588446795.214:1210): avc: denied { open } for pid=2925 comm="(monetdbd)" path="/var/lib/sss/mc/passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:13:15 2020 type=AVC msg=audit(1588446795.214:1211): avc: denied { map } for pid=2925 comm="(monetdbd)" path="/var/lib/sss/mc/passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:14:24 2020 type=AVC msg=audit(1588446864.487:1281): avc: denied { read } for pid=3072 comm="(monetdbd)" name="passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:14:24 2020 type=AVC msg=audit(1588446864.487:1282): avc: denied { open } for pid=3072 comm="(monetdbd)" path="/var/lib/sss/mc/passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 ---- time->Sat May 2 21:14:24 2020 type=AVC msg=audit(1588446864.487:1283): avc: denied { map } for pid=3072 comm="(monetdbd)" path="/var/lib/sss/mc/passwd" dev="dm-0" ino=524514 scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:var_t:s0 tclass=file permissive=1 -- ==================================================================== ICIS, office M1.00.05 Radboud University Mercator 1 Faculty of Science Toernooiveld 212 arjen(a)cs.ru.nl NL-6525 EC Nijmegen, The Netherlands +31-(0)24-365 2354 ===================== http://www.informagus.nl/ ==================== -- ==================================================================== ICIS, office M1.00.05 Radboud University Mercator 1 Faculty of Science Toernooiveld 212 arjen(a)cs.ru.nl NL-6525 EC Nijmegen, The Netherlands +31-(0)24-365 2354 ===================== http://www.informagus.nl/ ====================

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Announcement: New Jul2021-SP2 Bugfix release of MonetDB suite
by Sjoerd Mullender 21 Dec '21

21 Dec '21

The MonetDB team at MonetDB BV is pleased to announce the Jul2021-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/>. Jul2021-SP2 Bugfix Release (11.41.13) Client Package * Dumping the database now also dumps the read-only and insert-only states of tables. MonetDB Common * Sometimes when the server was restarted, it wouldn't start anymore due to an error from BBPcheckbats. We finally found and fixed a (hopefully "the") cause of this problem. SQL Frontend * Number parsing for SQL was fixed. If a number was immediately followed by letters (i.e. without a space), the number was accepted and the alphanumeric string starting with the letter was interpreted as an alias (if aliases were allowed in that position). Bug Fixes * 7163: Multiple sql.mvc() invocations in the same query * 7167: sys.shutdown() problems * 7184: Insert into query blocks all other queries * 7185: GROUPING SETS on groups with aliases provided in the SELECT returns empty result * 7186: data files created with COPY SELECT .. INTO 'file.csv' fail to be loaded using COPY INTO .. FROM 'file.csv' when double quoted string data contains the field values delimiter character * 7191: [MonetDBe] monetdbe_cleanup_statement() with bound NULLs on variable-sized types bug * 7196: BATproject2: does not match always * 7198: Suboptimal query plan for query containing JSON access filter and two negative string comparisons * 7200: PRIMARY KEY unique constraint is violated with concurrent inserts * 7206: Python UDF fails when returning an empty table as a dictionary

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Archiving of MonetDBLite repositories
by Panagiotis Koutsourakis 15 Dec '21

15 Dec '21

Hello all, We would like to announce that MonetDBLite has been replaced by MonetDB/e. On January we will archive the following repositories: https://github.com/MonetDB/MonetDBLite-C https://github.com/MonetDB/MonetDBLite-R https://github.com/MonetDB/MonetDBLite-Python https://github.com/MonetDB/MonetDBLite-Java We've moved the best bits of MonetDBLite to MonetDB/e (i.e. MonetDB embedded), which we continue to develop and maintain. MonetDB/e is developed in the same codebase as the MonetDB server. This means that all new features and bug fixes land automatically in MonetDB/e. You can find bindings for Python (https://github.com/MonetDBSolutions/MonetDBe-Python) and Java (https://github.com/MonetDBSolutions/MonetDBe-Java) and we are working on bindings for R. You can also find a repository with code examples (https://github.com/MonetDBSolutions/monetdbe-examples)

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Monetdbe and functions
by Ioannis Foufoulas 03 Dec '21

03 Dec '21

Hi, this is a question for monetdbe, I am trying to use create function with monetdbe, I ‘m getting a 'pyapi3.eval' library error in: Embedded Python 3 has not been enabled. Start server with --set embedded_py=3, however I am running the embedded version and I don’t know how to enable pyapi. Is there any configuration file, or any other workaround to enable these extensions? Thanks

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