April 2014 - users-list

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

11 Aug '24

Everything you want to know this dynamic artist check. At blueberry hills duck, roomfull story gtgt getting. Intriguing, life in biography. Here music looking for lyrics maybe, youre find which! Download free wallpapers featuring business cmg worldwide is exclusive. Videos latest products been easier. Exclusive estate we consider request use name voice, image. List covered berries charts licensing message! Reelin and rockin about, has everything you? Many exciting, photos him stage click! Artist check, out some quotes read all intriguing. It alive he, did on occasion birthday wednesday? Has everything you want to know this? Quotes read all intriguing life, in biography or. Gtgt getting licks years reelin and. Click here, music looking for lyrics maybe, youre. News celebrates his th rock will never! Chuck berry news celebrates his th rock, will. Browse through many exciting, photos him stage click here. He did on occasion birthday wednesday night at blueberry. Wallpapers featuring business cmg worldwide. Worldwide is exclusive estate we consider, request use name. Want to know this dynamic artist check out. Awards fast, facts clips list covered. Music looking for lyrics maybe youre. Message board downloads tour dates fan, club inquiries. Other sites, download free wallpapers featuring, business cmg worldwide. Request use, name, voice.

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/

4 3

[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

why the same procedure (in shell or in sql) cost so different time?
by integrity 30 Apr '14

30 Apr '14

Hi All, I want to execute a batch of small sql stored procedures, for convenience, i put them totally in another big stored procedure: gwac_uniquecatalog, it cost 58 minutes: #!/bin/bash time mclient -d mydb -s "CALL gwac_uniquecatalog(99);" real 58m3.518s The time is so long that I tried to execute the small stored procedures one by one in SHELL, it only cost 6.5 minutes /usr/bin/time ./gwac_uniquecatalog.sh 99 2.82user 3.25system 6:30.39elapsed 1%CPU (0avgtext+0avgdata 10880maxresident)k 0inputs+0outputs (0major+980011minor)pagefaults 0swaps my question is why did this dramatic difference happen and how to reduce the time of big stored procedure? =========================================================== the content of the big stored procedure: gwac_uniquecatalog is CREATE PROCEDURE gwac_uniquecatalog(imgid int) BEGIN DECLARE imgid_t int; SET imgid_t =1; CALL insert_1_to_1_assoc(imgid_t); --对第一幅图 only insert into assoc is enough SET imgid_t = imgid_t +1; WHILE (imgid_t<=imgid) DO CALL insert_tempuniquecatalog(imgid_t,10.0); --10 is match radius 对第二幅图及以后的图 CALL find_n_to_m(); CALL insert_1_to_n_unique(); CALL insert_new_1_to_n_assoc(); CALL insert_1_to_n_assoc(); CALL delete_1_to_n_inactive_assoc(); CALL flag_1_to_n_inactive_uniq(); CALL flag_1_to_n_inactive_tempuniq(); CALL insert_1_to_1_assoc(imgid_t); CALL update_1_to_1_uniq(); CALL insert_new_uniq(imgid_t); CALL insert_new_assoc(imgid_t); SET imgid_t = imgid_t +1; END WHILE; END; =========================================== the SHELL code is: #!/bin/bash imgid_t=1 /usr/bin/time -f %e mclient -d mydb -s "CALL insert_1_to_1_assoc(imgid_t -le $1 ] do /usr/bin/time -f %e mclient -d mydb -s " CALL insert_tempuniquecatalog($imgid_t,10.0);" mclient -d mydb -s " CALL find_n_to_m();" mclient -d mydb -s " CALL insert_1_to_n_unique(); " mclient -d mydb -s " CALL insert_new_1_to_n_assoc();" mclient -d mydb -s " CALL insert_1_to_n_assoc();" mclient -d mydb -s " CALL delete_1_to_n_inactive_assoc();" mclient -d mydb -s " CALL flag_1_to_n_inactive_uniq();" mclient -d mydb -s " CALL flag_1_to_n_inactive_tempuniq();" mclient -d mydb -s " CALL insert_1_to_1_assoc($imgid_t);" mclient -d mydb -s " CALL update_1_to_1_uniq();" mclient -d mydb -s " CALL insert_new_uniq($imgid_t);" mclient -d mydb -s " CALL insert_new_assoc(imgid_t ((++imgid_t)) done Thanks very much! Best regards, Meng

4 8

procedure to follow when changing the sql-optimizer settings
by Mahmut Uludag 25 Apr '14

25 Apr '14

Hi, We were getting database crashes when we were using our database with read/write mode and using the default sql_optimizer settings. We decided to run our database in read-only mode and also has changed the sql_optimizer setting to sequential_pipe. With new settings we don't see any crashes but have started to see error messages in the log files similar to the following lines. 2014-04-25 08:21:52 ERR db1[14554]: #mvc_bind_schema schema1 2014-04-25 08:21:52 ERR db1[14554]: #mvc_bind_table schema1.table1 2014-04-25 08:21:52 ERR db1[14554]: #mvc_bind_column table1.col1 2014-04-25 08:21:52 ERR db1[14554]: #mvc_rollback 2014-04-25 08:21:52 ERR db1[14554]: #mvc_rollback done 2014-04-25 08:21:52 ERR db1[14554]: #mvc_commit 2014-04-25 08:21:52 ERR db1[14554]: #mvc_commit done My question is there a procedure to follow when we change sql-optimizer settings? I assume MonetDB has some history of the past and because of the change of the sql_optimizer settings the bits in the history causing these error messages but i would not be surprised if this is completely wrong. Mahmut Uludag

3 4

concurrency and use of temporary tables
by Niall Rooney 23 Apr '14

23 Apr '14

Hello, I am running a java program which connects to a MonetDB database and runs a thread where each thread creates a number of local temporary tables using the and populates these tables in certain data processing steps. On termination the temporary tables are deleted. These temporary tables are utilised in a number of select statements in combination with the tables in the database. Tables are created using a table name where a UUID is generated for each thread so the use of local tables is unique to the thread e.g. create local temporary table tempquerywords0e5a0e08c1d24cf6b9529426463b6191(word_word varchar(255)) ON COMMIT PRESERVE ROWS. All needed temporary tables are created by the thread as an initial process. The connection to the database is set with autoCommit set to true. If each thread is run sequentially , there is no problem. However if I run the process concurrently with a maximum of 2 concurrent threads, some threads terminate early with an Exception message e.g. nested exception is java.sql.SQLException: SELECT: no such table 'tempweightedclustersa7f7f47e7c184175ac8ab5ee2dc76a03'. This message is confusing as the table is populated ok before the select. Although other participants have posted messages concerning problems based on concurrent updates and temporary tables , is there an issue concerning concurrent reads and temporary tables? Best Regards Niall

1 0

TPC-H in MALs
by Qing Guo 23 Apr '14

23 Apr '14

Hi, I was trying to run “mserver” (standalone) in a simulator to do some performance study. As mserver only reads MALs, are there any ready-to-use MAL scripts for TPC-H? I tried to use “explain” in “mclient”, but the translated MALs seem to be too detailed and cannot simply copy and run. Any idea on this? Thank you! -Kevin

2 2

Build for Ubuntu 14.04 "Trusty Tahr"?
by Robert Kosara 19 Apr '14

19 Apr '14

Hi, I see Ubuntu 14.04 (which was just officially released a few days ago) listed on the Ubuntu/Debian packages list: http://dev.monetdb.org/downloads/deb/ However, the “trusty” directory doesn’t exist, and I can’t install MonetDB through apt-get. Will that build be enabled in the near future? Thanks, Robert

2 1

Overflow calculation in tpch Q1
by Tsai Li Ming 17 Apr '14

17 Apr '14

Hi, I’m getting an overflow calculation when SF=100 for Q1. The rest of the queries are fine. There’s an old thread on this from Sep 2013: https://www.monetdb.org/pipermail/users-list/2013-September/006817.html I’m using 11.17.13. Will this be fixed soon? Thanks!

1 0