May 2020 - users-list

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

11 Aug '24

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2 1

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/

3 3

[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

Dear Professor/Lecturer Please excuse us for contacting you directly. We are offering an efficient service to help you ensure your academic and professional work is written in perfect English. We will check the grammar and style of your work and return it to you to meet your requirements and deadlines. Proof-Reading-Service.com can provide you with a professional proofreading service at a very reasonable rate. All our proofreaders are highly qualified native English speakers. Many work as leading academics in their fields and all have extensive experience of proofreading to the highest standards. If you are interested in our service, please take a look at our website: www.proof-reading-service.com All you have to do is send us your document as a word attachment with the deadline and we will guarantee delivery of a perfectly written document to give you complete confidence when you submit your work. The fee is worked out on a flat rate (£6.95 per thousand words or 0.695 pence per word), so you know exactly how much the proofreading will cost in advance. Once we have received your document(s) we will confirm the word count, the price and the deadline. If you have not heard from us within 2 hours during normal business hours after you have sent your work please resend it from a different email account or send the file to proofreadings(a)gmail.com. We look forward to hearing from you! Yours faithfully Proof-Reading-Service.com

2 2

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/ ====================

2 6

Crashed Database
by Ariel Abadi 20 May '20

20 May '20

Hi! I have deployed several MonetDB databases on different customers, the database is excellent haven't had that much problems, but I'm starting feeling that the database is becoming "fragile" Yesterday I have 2 crashes... Firstly, a database of 2.4TB of data... Monet crashed... and the only information I have received was: ERR cli_mx[28693]: #main thread:!ERROR: BBPcheckbats: file /opt/monetdb/cli_mx/cli_mx/bat/52/5236.tail too small (expected 137803304, actual 137166848) 2020-05-19 11:10:00 MSG cli_mx[28693]: !ERROR: BBPcheckbats: file /opt/monetdb/cli_mx/cli_mx/bat/52/5236.tail too small (expected 137803304, actual 137166848) 2020-05-19 11:08:11 ERR control[28629]: (local): failed to fork mserver: database 'cli_mx' has crashed after starting, manual intervention needed, check monetdbd's logfile (merovingian.log) for details Obviously that info Ive got it from merovingian.log.... so, which is the manual intervention needed... dont know! We run a backup all the nights (we rsync the database farm against backup server). Dont know the reason, but it seems that at moment of the backup, eventhought the database was working fine... The backup was done. So when I received the "crashed" notice.. I tried to recover from the backup.... but it seems the copy was already failing. So I had to start from zero... uploading all the information again. it was a very tought job, once I completed (at 1am in the morning), I stopped the db to do backup.... Again... the database has crashed!!!! never again started!!!! In this case the error was the following: 2020-05-19 23:57:52 MSG merovingian[2379]: sending process 2389 (database 'cli_mx') the TERM signal 2020-05-19 23:57:53 MSG merovingian[2379]: database 'cli_mx' has shut down 2020-05-19 23:57:53 MSG control[2379]: (local): stopped database 'cli_mx' 2020-05-19 23:57:54 MSG merovingian[2379]: database 'cli_mx' (2389) has exited with exit status 0 So the 3rd time, needed to upload the information again.. I have just finished!... Now, obviously I am scared to stop and start the db... and till this moment i dont have a backup of the farm directory. Can someone please help me to find the problem why the database has crashed? The only thing that I found on the /var/log/messages was the following (may be this may help to find the issue) May 19 23:03:49 mx-pve kernel: [4716718.867312] mserver5[19453]: segfault at 138 ip 00007fad7b66b1e9 sp 00007ffe648e5600 error 6 in lib_sql.so[7fad7b532000+1bc000] May 19 23:10:03 mx-monet kernel: [4717092.595561] mserver5[22348]: segfault at 138 ip 00007f07572d41e9 sp 00007ffd9f5aa950 error 6 in lib_sql.so[7f075719b000+1bc000] May 19 23:15:03 mx-monet kernel: [4717392.674941] mserver5[24044]: segfault at 138 ip 00007f4e7c0041e9 sp 00007ffeab6e8e90 error 6 in lib_sql.so[7f4e7becb000+1bc000] May 19 23:16:57 mx-monet kernel: [4717506.863046] mserver5[24675]: segfault at 138 ip 00007f8710d891e9 sp 00007ffc71a0e4a0 error 6 in lib_sql.so[7f8710c50000+1bc000] Do you have an idea what can I do ???! The version Im using is: v11.35.19 (Nov2019-SP3) on a Linux Centos 7. Ariel

1 0

ILIKE Operator. Bad function?
by Ariel Abadi 20 May '20

20 May '20

Hi! May be some can help me. We are using the ILIKE operator to filter data. When we use a couple of "%" at a certain point the db stops filtering correctly. We started with *ILIKE '%guate%' *it found 7 records, then we changed to *ILIKE '%guate%**com% *it found 1 record (which is ok)... finally we changed to *ILIKE '%guate%mo%**com%**' *and now it didn't find anything :'( Please see the attached examples... *A*) sql>SELECT DISTINCT nts_area_name FROM sb_rmsv.nts_nt_sum_report WHERE nts_area_name *ILIKE '%guate%'*; +---------------------------+ | nts_area_name | +===========================+ | Guatemala | | Guatemala-Mobile | | Guatemala-Mobile Comcel | | Guatemala-Mobile Movistar | | Guatemala-Mobile PCS | | Guatemala-Telgua | | Guatemala-Telefonica | +---------------------------+ *B*) sql>SELECT DISTINCT nts_area_name FROM sb_rmsv.nts_nt_sum_report WHERE nts_area_name *ILIKE '%guate%**com%;* +-------------------------+ | nts_area_name | +=========================+ | Guatemala-Mobile Comcel | +-------------------------+ *C*) sql>SELECT DISTINCT nts_area_name FROM sb_rmsv.nts_nt_sum_report WHERE nts_area_name *ILIKE '%guate%mo%**com%**'*; +---------------+ | nts_area_name | +===============+ +---------------+ 0 tuples

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Auto-scaling MonetDB cluster on AWS?
by Pascal Heus 18 May '20

18 May '20

Has anyone configured an scalable MonetDB using Docker cluster on Amazon Web Services or other cloud environment? I'm looking into setting this up for one of our project around COBID-19 and essentially need to: - have my number of MonetDB instances to go up and down with user demand - use a load balancer to spread user queries across multiple instances I had in mind that all the instances would just point to a single dbfarm directory (all the user queries are read only), but is this an option or will cause problems (locks, caching, etc.)? Based on what I understand from Cluster Management (https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/ClusterManagement) or Lazy Replication (https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/WorkloadCaptureR…) I need to replicate the database for each instance, which is not really practical. This document seems to hint that using the "Replication Services" model would be an option, but then I end up with any copies of the same database, and this will require a significant amount of extra disk space (the transaction logs + one copy per instance). http://www.exanest.eu/pub/2016_RTPBD_Monetdb.pdf Any guidance, suggestion, example would be greatly appreciated. best *P

2 1

MonetDB Cluster size
by 逄振洲 11 May '20

11 May '20

i am very interested in using MonetDB as OLAP solution，But now I have a few questions。 1. MonetDB cluster the largest scale ? 2. any customer case study ?

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