November 2017 - 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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DEC2016-SP2 and BINARY bulk load
by Lynn Carol Johnson 11 Jan '18

11 Jan '18

Hi all – I have always used the COPY BINARY INTO … commands to load my 2.0 Billion row genetic data into a monetdb table. With 135 columns, it has been blindingly fast. Last week I moved from the June2016-SP2 release to dec2016-SP2. My binary loads are taking WAY longer. I killed one after 3 hours (via “call sys.stop(pid)” so it could clean up properly). I then started the load again, thinking perhaps the problem was related to the new columns I was adding. I have since dropped the table and remade it using the same data and scripts that worked in just over 3 minutes in February on the jun2016-SP2 load. It is really chugging along – I’m up to 30 minutes and counting. I don’t have access to the sql log files, but the Merovingian.log shows nothing. I do notice that previously the binary files, once loaded, were removed from the loading directly. This does not happen now. Were these files previously “moved” and now they are copied? Has anyone see this performance issue with Dec2016-SP2 COPY BINARY INTO …. Commands? Thanks - Lynn

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Re: algebra.join heapextend crash
by Stefan Manegold 13 Dec '17

13 Dec '17

Allocating "only" about 2.8 GB does not ring alarms that the plan night be degenerated - assuming your data is not tiny. Could you share:OS, full query, data sizes, free disk space at time of failure, mserver5 process size at time of failure? Thanks,Stefan -------- Original message --------From: Anthony Damico <ajdamico(a)gmail.com> Date: 11/22/17 12:13 (GMT+01:00) To: Communication channel for MonetDB users <users-list(a)monetdb.org> Subject: algebra.join heapextend crash hi, i'm using monetdblite-r 0.5.0 on a confidential dataset. my syntax worked on monetdblite 0.3.1 on the same machine ftruncate: Invalid argument Error in .local(conn, statement, ...) : Unable to execute statement 'CREATE TABLE ccaed123_b_svcmon_xwalk AS ( SELECT a.enrolid , a.yr , a.dataty...'. Server says 'MALException:algebra.join:GDK reported error. !ERROR: GDKextendf: c !ERROR: HEAPextend: failed to extend to 2890530816 for 02\57\25766.tail: GDKmre map() failed '. it's a local drive, the hard disk isn't close to full and the machine has 700gb of ram, but the table it's trying to create might be bigger than that. dunno if related to https://www.monetdb.org/bugzilla/show_bug.cgi?id=3791 thanks

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MonetDB Blob Inserts
by Brian Hood 07 Dec '17

07 Dec '17

Hi Guys, I don't seem to be able to INSERT into a blob field is there any information how to achieve this. Regards, Brian Hood

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Re: MAL query "sql.resultSet"
by dennis.fassl 01 Dec '17

01 Dec '17

Hi all, can you help me with the below query? Is there an other way to return query results using the jdbc interface (without using sql.resultSet)? Thanks in advance! Best regards,Dennis -------- Ursprüngliche Nachricht --------Von: Dennis Fassl <dennis.fassl(a)uni-konstanz.de> Datum: 25.11.17 16:55 (GMT+01:00) An: users-list(a)monetdb.org Betreff: MAL query "sql.resultSet" Hi all, I am trying to execute the MAL query below. But the command "sql.resultSet" is terminating mclient. When using the JDBC interface I get "SQLException: Connection to server lost! (mserver still alive?)". Do you have an idea why this is happening? Thanks and regards, Dennis sql.init(); table_names := bat.new(nil:str); bat.append(table_names, "t0"); bat.append(table_names, "t1"); table_attrs := bat.new(nil:str); bat.append(table_attrs, "int_col"); bat.append(table_attrs, "str_col"); table_types := bat.new(nil:str); bat.append(table_types, "int"); bat.append(table_types, "str"); table_lens := bat.new(nil:int); bat.append(table_lens, 1); bat.append(table_lens, 1); table_scales := bat.new(nil:int); bat.append(table_scales, 0); bat.append(table_scales, 0); ints := bat.new(nil:int); bat.append(ints, 42); bat.append(ints, 23); strs := bat.new(nil:str); bat.append(strs, "foo"); bat.append(strs, "bar"); sql.resultSet(table_names, table_attrs, table_types, table_lens, table_scales, ints, strs); _______________________________________________ users-list mailing list users-list(a)monetdb.org https://www.monetdb.org/mailman/listinfo/users-list

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MAL query "sql.resultSet"
by Dennis Fassl 25 Nov '17

25 Nov '17

Hi all, I am trying to execute the MAL query below. But the command "sql.resultSet" is terminating mclient. When using the JDBC interface I get "SQLException: Connection to server lost! (mserver still alive?)". Do you have an idea why this is happening? Thanks and regards, Dennis sql.init(); table_names := bat.new(nil:str); bat.append(table_names, "t0"); bat.append(table_names, "t1"); table_attrs := bat.new(nil:str); bat.append(table_attrs, "int_col"); bat.append(table_attrs, "str_col"); table_types := bat.new(nil:str); bat.append(table_types, "int"); bat.append(table_types, "str"); table_lens := bat.new(nil:int); bat.append(table_lens, 1); bat.append(table_lens, 1); table_scales := bat.new(nil:int); bat.append(table_scales, 0); bat.append(table_scales, 0); ints := bat.new(nil:int); bat.append(ints, 42); bat.append(ints, 23); strs := bat.new(nil:str); bat.append(strs, "foo"); bat.append(strs, "bar"); sql.resultSet(table_names, table_attrs, table_types, table_lens, table_scales, ints, strs);

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Number of instance
by Sharma, Sreejith 23 Nov '17

23 Nov '17

All, May be a dump question, but curious to know. What is the maximum number of MonetDB instance anyone has setup in a single server? And what level of concurrency has been tested? Regards, Sreejith

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