January 2016 - 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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Find all running processes?
by Vijay Krishna 31 Mar '16

31 Mar '16

How to find all running processes and their statuses in MonetDB?? I found this... https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/monitor But I couldn't get this work... I ran a query (which took some 20 seconds to complete) in a window and connected the same database in another terminal and ran "select * from sys.queue" (several times during those 20 seconds) but I could get only this... sql>select * from sys.queue; +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ | qtag | user | started | estimate | progress | status | tag | query | +=======+=========+============================+============================+==========+=========+============+==========================+ | 27339 | monetdb | 2015-08-13 05:35:40.000000 | null | null | running | 12532134@0 | select * from sys.queue; | +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ I am using Oct-2014 version of monetdb on CentOS... Is there a way to find all running processes and their statuses in MonetDB?? Thanks & Regards, Vijayakrishna.P. Mobile : (+91) 9500402305.

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WAL read files
by Pierre-Adrien Coustillas 08 Feb '16

08 Feb '16

Hi, is it possible to read WAL files ? sql/ log.<transaction id> why ? We still have a problem of duplicate table . All our monetsdb are updated with the latest version of the repository debian8 , and that several server. We have learned to remove duplicate tables and a stable production. But I want to understand this bug Duplication of tables are always created after a restart monetdb After reading this page https://www.monetdb.org/blog/monetdb-sql-transaction-management-scheme, and particularly this ""By default, persisted transactions are cleaned up from the WAL. During database startup, all transaction still left in the WAL are read and any that are not yet applied are written into the persistent BAT storage"" . I think that the drop or create commands are not cleaned up from the WAL We used the library php _ map.inci and we run a lot of command drop / create ( ... I know this is not recommended ... ) We used autocommit. If I can read and understand what is in the WAL file, can help me understand this bug Thank Pierre -- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35 // 09 54 38 70 90

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Multi-core join performance
by Koliousis, Alexandros 01 Feb '16

01 Feb '16

Hi, Thank you for your reply. The system has 16 physical cores (2 sockets, 8 cores/sockets, 20MB L3 cache, 256KB L2) and 64GB of RAM. The MonetDB server uses 16 threads to serve my test database and it finds ~63GB of available memory. I used synthetic data to populate the two tables (with names A and B). The particular query I reported about in my previous e-mail generates a lot of output: approx. 500 million tuples. The join predicate is (A.a1 < B.b1) where columns A.a1 and B.b1 contain all unique integers from 1 to 32768. With a lower selectivity (say, 1%, by controlling the values inserted into A.a1 and B.b1), the query executes faster but its behaviour is the same: only 1 thread is utilised. Attached is a trace of the query. Hope this helps, Alexandros PS: Apologies for the separate thread; somehow I ended up subscribing in digest mode > Hi > > This is insufficient information to shed light on it. > Crucial information is system characteristics. > And also a TRACE of your query can shed light on the issue. > > Furthermore, is it a cold or hot execution of the query? > > regards, Martin > > On 20/01/16 13:24, Alexandros Koliousis wrote: > > Hi, > > > > I am joining two tables, each with 32K tuples. The query runs for > ~23-24 seconds on my (multi-core) machine. > > > > During execution, however, only 1 core is utilised, while the rest > of the CPU cores are idle. The cores are under-utilised although I > have configured the MonetDB server to use all the physical cores of my > machine (either by setting 'nthreads' or, in the > > case of mserver5, 'gdk_nr_threads'). > > > > I am running MonetDB server v11.21.13 "Jul2015-SP2", compiled from > source. > > > > Is this due to some configuration setting I missed? Or, due to the > fact that I am running a single-operator query? > > > > Alternatively, I was thinking of creating merge tables, thus > partitioning my tables manually, hoping that this will allow for > intra-operator parallelism. > > > > Thanks, > > > > Alexandros > > > > > > > > _______________________________________________ > > users-list mailing list > > users-list at monetdb.org > > https://www.monetdb.org/mailman/listinfo/users-list > >

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Stored procedure
by poornima＠apakau.com 30 Jan '16

30 Jan '16

Hi, Can you help me with creating a stored procedure in monet ? I keep getting unexpected END even for a simple procedure as follows. create procedure foobar() begin end; I have even tried with the delimiter like in mysql. Nothing works. Regards, Poornima.

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MonetDB test client application not linking
by Ivan Zuboff 30 Jan '16

30 Jan '16

I tried to compile test application ( https://www.monetdb.org/Documentation/Manuals/SQLreference/Programming/MAPI) for MonetDB under Ubuntu 14.04 LTS Trusty Tahr. I followed the download instructions from official site (https://www.monetdb.org/downloads/deb) installation was successful, then I installed a bunch of other packages in order to copmpile it. Now when I try to compile and link test application I get the following errors: libtool: compile: gcc -c -I/usr/include/monetdb test.c -fPIC -DPIC -o .libs/test.o libtool: compile: gcc -c -I/usr/include/monetdb test.c -o test.o >/dev/null 2>&1 libtool: link: gcc -o test test.o -lmapi -lstream -lssl -lcrypto -lcurl -lz test.o: In function `die': test.c:(.text+0x1c): undefined reference to `mapi_explain_query' test.c:(.text+0x27): undefined reference to `mapi_result_error' test.c:(.text+0x3f): undefined reference to `mapi_explain_result' test.c:(.text+0x4a): undefined reference to `mapi_next_result' test.c:(.text+0x5a): undefined reference to `mapi_close_handle' test.c:(.text+0x65): undefined reference to `mapi_destroy' test.c:(.text+0x81): undefined reference to `mapi_explain' test.c:(.text+0x8c): undefined reference to `mapi_destroy' test.o: In function `query': test.c:(.text+0xde): undefined reference to `mapi_query' test.c:(.text+0xf2): undefined reference to `mapi_error' test.o: In function `update': test.c:(.text+0x133): undefined reference to `mapi_close_handle' test.o: In function `main': test.c:(.text+0x190): undefined reference to `mapi_connect' test.c:(.text+0x1a0): undefined reference to `mapi_error' test.c:(.text+0x222): undefined reference to `mapi_fetch_field' test.c:(.text+0x23a): undefined reference to `mapi_fetch_field' test.c:(.text+0x266): undefined reference to `mapi_fetch_row' test.c:(.text+0x276): undefined reference to `mapi_close_handle' test.c:(.text+0x282): undefined reference to `mapi_destroy' collect2: error: ld returned 1 exit status ./t.sh: 11: ./t.sh: ./test: not found What I'm doing wrong? What should I additionally install or change in compilation options for successful linking of test example? Best regards and thanks in advance, Ivan

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A test email (please ignore)
by Ying Zhang 29 Jan '16

29 Jan '16

Dear all, This is just a test e-mail to see if I can still send/receive e-mails to/from this mailing list, since the last e-mail I received here was on Jan. 22nd, 2016. Is it just because MonetDB has been issues free the past days, or is something wrong with the email server? Sorry for bothering you. Regards, Jennie

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