June 2022 - 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

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

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Monetdb odbc driver
by imad hajj chahine 22 Jun '22

22 Jun '22

Hi, Is it possible to use 2 versions of the odbc driver simultaneously on the same windows machine? Since the windows installer does not allow this, I copied the installation folder from another machine and register the driver using the following command: odbcconf /A {INSTALLDRIVER "MonetDB ODBC Driver Old|driver=C:\Program Files\MonetDB\MonetDB ODBC Driver Old\lib\MonetODBC.dll|Setup=C:\Program Files\MonetDB\MonetDB ODBC Driver Old\lib\MonetODBCs.dll|APILevel=1|ConnectFunctions=YYY|DriverODBCVer=03.52|SQLLevel=3"} In the registry and the ODBC datasources the driver "MonetDB ODBC Driver Old" is registered correctly, but when I try to create a DSN for the new driver I am getting Error "Invalid Driver name". Does the Monetdb odbc driver need to have the exact name "MonetDB ODBC Driver"? Thanks.

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Variable scope in Mal function
by imad hajj chahine 16 Jun '22

16 Jun '22

Hi, I have a mal function defined as following: function halfofyear(pdate:bat[:date]):bat[:int]; hym:= batmtime.month(pdate); hy:= batcalc.-(hym, 1, nil:bat); hy:= batcalc./(hy, 6, nil:bat); return halfofyear:= batcalc.+(hy, 1, nil:bat); end halfofyear; and I am calling it twice on 2 date columns: select halfofyear(colDate1), halfofyear(colDate2) from table. My concern is the scope of variables defined (hym, hy), as I was expecting to have unique naming when executing. Is it a guarantee that internally they are different variables or these are shared across the calls from the same query. bellow is the trace produced: hym=[57530]:bat[:int] := batmtime.month(pdate=[57530]:bat[:date]); hym=[57530]:bat[:int] := batmtime.month(pdate=[57530]:bat[:date]); hy=[57530]:bat[:int] := batcalc.-(hym=[57530]:bat[:int], 1:int, nil:BAT); hy=[57530]:bat[:int] := batcalc.-(hym=[57530]:bat[:int], 1:int, nil:BAT); hy=[57530]:bat[:int] := batcalc./(hy=[57530]:bat[:int], 6:int, nil:BAT); hy=[57530]:bat[:int] := batcalc./(hy=[57530]:bat[:int], 6:int, nil:BAT); return halfofyear=[57530]:bat[:int] := batcalc.+(hy=[57530]:bat[:int], 1:int, nil:BAT); return halfofyear=nil:bat[:int] := batcalc.+(hy=nil:bat[:int], 1:int, nil:BAT); function batudf.halfofyear(pdate:bat[:date]):bat[:int]; X_22=[57530]:bat[:int] := batudf.halfofyear(X_20=[57530]:bat[:date]); return halfofyear=[57530]:bat[:int] := batcalc.+(hy=[57530]:bat[:int], 1:int, nil:BAT); return halfofyear=nil:bat[:int] := batcalc.+(hy=nil:bat[:int], 1:int, nil:BAT); function batudf.halfofyear(pdate:bat[:date]):bat[:int]; X_25=[57530]:bat[:int] := batudf.halfofyear(X_21=[57530]:bat[:date]); barrier X_76=false:bit := language.dataflow(); X_26=33:int := sql.resultSet(X_27=[2]:bat[:str], X_28=[2]:bat[:str], X_29=[2]:bat[:str], X_30=[2]:bat[:int], X_31=[2]:bat[:int], X_22=[57530]:bat[:int], X_25=[57530]:bat[:int]); Thanks.

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change Mal function definition without server restart
by imad hajj chahine 16 Jun '22

16 Jun '22

Hi, Is it possible to change the Mal function definition while the server is running without restarting? I tried connecting with mclient -lmal and running the function in an attempt to override the previous definition with no luck. any similar syntax to sql create or replace in Mal? Thanks.

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Possible Loss of data (11.27.9)
by imad hajj chahine 16 Jun '22

16 Jun '22

Hi, I still have a server running 2017-sp2 (11.27.9) version, we had several reports of tables becoming empty after no activity for a period of one month or more. These tables are loaded from csv using the copy command, and at the time of loading the tables contain the correct data. Querying sys.storage showed that the oid column has a count of 210852 while the others are empty. Digging into the release-notes i only found the following alarming issue: https://github.com/MonetDB/MonetDB/issues/6465 I know that release is not supported anymore and I am planning a migration. Any idea what's the reason behind this behavior, was this reported before? [image: image.png] Thanks. Regards.

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