August 2014 - 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/

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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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MonetDB Cluster Management
by Ali Salem 05 Sep '14

05 Sep '14

Hello all, I followed the tutorial on https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/ClusterManagement but I still can't get it to work. I followed all instructions, but *monetdb discover *only returns instance(s) running on the same machine, but not others on the network. I am using three machines running debian, with monetdb installed and configured according to the link above. What am I missing? Your assistance is highly appreciated.

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Available binary functions
by Dennis Pallett 02 Sep '14

02 Sep '14

Hi all, I'm just wondering what kind of binary functions MonetDB comes with standard? I'm specifically looking for a function to convert a smallint/int/bigint into a byte array (either big or little endian), concat several byte arrays into a single byte array and encode a byte array as a hex string. Do any such functions exist or do I need to write them myself in C? Best regards, Dennis Pallett

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Costly bat.new/bat.append not optimized out
by Frédéric Jolliton 28 Aug '14

28 Aug '14

Hi, Unless I'm missing something, I do not understand why this apparent pattern is not easily optimized out: X_3:bat[:oid,:lng] =<tmp_321264>[0] := bat.new(nil:oid,nil:lng); .. # X_3 is never used before this line. X_19=<tmp_331015>[23068647] := <some computation> X_20=<tmp_321264>[23068647] := bat.append(X_3=<tmp_321264>:bat[:oid,:lng][23068647], X_19=<tmp_331015>[23068647],true); # X_3 is never used after this line. An empty BAT is created for the sole purpose of appending a BAT with millions of rows, discarding the original one.. instead of just using it! This account for up to 30% of the time spent for some SQL queries! Like this one: SELECT name, avg(value) FROM some_view GROUP BY name LIMIT 10; I tried to manually remove these extra operation, and I got the exact same result, in less time. (I took the output of EXPLAIN, removed the lines in question, and added a bit of type information for the function to compile, before playing it in mclient -l mal.) Regarding the setup, for our tests, we have 3 tables (say, a, b and c) of 11M rows each, then a view declared as: CREATE VIEW some_view AS (SELECT * FROM a UNION ALL SELECT * FROM b UNION ALL SELECT * FROM c); I've tested it with v11.17.21 and v11.19.0, with the "default" optimizer. My question: is this extra operation required, or could it be optimized in MonetDB? -- Frédéric Jolliton SecurActive

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ODBC driver and config on the Mac?
by Robert Kosara 19 Aug '14

19 Aug '14

Hello, I’ve been trying to connect to MonetDB via ODBC on Mac OS X, without luck. I’m seeing the ODBC drivers in /usr/local/monetdb/lib/, but I’m confused that they are .so files and not .dylib. It looks like all the others are .dylib, and as far as I know that’s required so they can be loaded dynamically. I’ve tried using the .so files in the ODBC manager, but that has only made it crash. Has anybody used MonetDB with ODBC on the Mac? Can you perhaps show me your configuration? Thanks, Robert

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Table is not unique, corrupt catalog?
by Ali Salem 11 Aug '14

11 Aug '14

Hello all, Last night I imported 500M records into my fact table, it took around 19 hours, but it worked fine. I created my indexes afterwards with no issues as well. However, when I tried to access the rest of the tables in my database, I received the following error: table table_name is not unique, corrupt catalog? Any idea why this happened and how to fix it? Thank you.

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MonetDB partition by day
by Ali Salem 08 Aug '14

08 Aug '14

Hello all, I know MonetDB has window functions, but can I partition a table by day? If you can direct me to a link with examples, I'd appreciate it. Thanks

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