March 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

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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[Low level] Understanding duplicate entries in delta BAT (delete BAT)
by Frédéric Jolliton 08 Aug '16

08 Aug '16

Hi, As per MonetDB Solution suggestion, we are asking here about this topic. We are studying how MonetDB store its database on disk. So far we were able to understand pretty much all the files (BAT, journal, BBP.dir, heap, hash, imprints, and so on). We have custom tools to decode and dump them (experimental at this point). There is one thing however that is unclear: we thought that "delta BAT", which are the BAT assigned to an SQL tables to list the OIDs of rows that were deleted (named "D_<schema>_<table>" internaly), would contains only *uniques* values (since you can never delete twice the same row). But on several databases that we are running, we found that some of theses BATs contain duplicates. Lot of duplicates actually. Especially on D_sys__columns and D_sys__tables BATs (respectively for the sys._columns and sys._tables system tables). Some databases do not have this "issue" (while they all have the same schema, and process the same kind of data as the other ones). Can someone explain if duplicates are expected in theses BATs ? Here is an excerpt of D_sys__tables: # hexdump -C 02/210.tail 00000000 2e 00 00 00 00 00 00 00 2f 00 00 00 00 00 00 00 |......../.......| 00000010 30 00 00 00 00 00 00 00 31 00 00 00 00 00 00 00 |0.......1.......| 00000020 32 00 00 00 00 00 00 00 33 00 00 00 00 00 00 00 |2.......3.......| 00000030 34 00 00 00 00 00 00 00 35 00 00 00 00 00 00 00 |4.......5.......| 00000040 36 00 00 00 00 00 00 00 37 00 00 00 00 00 00 00 |6.......7.......| 00000050 42 00 00 00 00 00 00 00 43 00 00 00 00 00 00 00 |B.......C.......| 00000060 44 00 00 00 00 00 00 00 45 00 00 00 00 00 00 00 |D.......E.......| 00000070 46 00 00 00 00 00 00 00 47 00 00 00 00 00 00 00 |F.......G.......| 00000080 48 00 00 00 00 00 00 00 49 00 00 00 00 00 00 00 |H.......I.......| 00000090 4a 00 00 00 00 00 00 00 4b 00 00 00 00 00 00 00 |J.......K.......| 000000a0 4c 00 00 00 00 00 00 00 4d 00 00 00 00 00 00 00 |L.......M.......| 000000b0 4e 00 00 00 00 00 00 00 4f 00 00 00 00 00 00 00 |N.......O.......| 000000c0 50 00 00 00 00 00 00 00 50 00 00 00 00 00 00 00 |P.......P.......| 000000d0 51 00 00 00 00 00 00 00 50 00 00 00 00 00 00 00 |Q.......P.......| 000000e0 51 00 00 00 00 00 00 00 52 00 00 00 00 00 00 00 |Q.......R.......| 000000f0 50 00 00 00 00 00 00 00 51 00 00 00 00 00 00 00 |P.......Q.......| 00000100 52 00 00 00 00 00 00 00 53 00 00 00 00 00 00 00 |R.......S.......| 00000110 50 00 00 00 00 00 00 00 51 00 00 00 00 00 00 00 |P.......Q.......| 00000120 52 00 00 00 00 00 00 00 53 00 00 00 00 00 00 00 |R.......S.......| ... You can clearly see duplicates OID (the first one being 0x50 at 0xc8). Its entry in BBP.dir (split into sections): 136 32 tmp_210 tmpr_210 02/210 610523782 2 171807 0 0 171807 172032 0 0 0 0 void 0 1 1793 0 0 0 0 0 1000651 0 0 0 oid 8 0 1024 24 25 27 1 46 773603235 1374456 1376256 1 We are using: MonetDB 5 server v11.21.14 (64-bit, 64-bit oids, 128-bit integers). -- Frédéric Jolliton Sécuractive

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group_concat in MAL not working due to algebra.uselect
by Puthick Hok 04 Jun '16

04 Jun '16

Hi, Last year, I was looking for the MAL definition of group_concat and Nik Schuiling gave me the MAL definition which is below. We compile MonetDB from source and this definition was working on MonetDB-11.19.9 (Oct2014-SP2). Since this version, there has been a number of newer versions of MonetDB. So, I was trying to upgrade our system to the latest version of MonetDB (11.21.13). After the installation of the newer version, I ran: select "DataSetId", group_concat("FieldName") from datasetmarkermeta group by "DataSetId"; from mclient interface and got the following error message: TypeException:kddart.subgroup_concat[5]:'algebra.uselect' undefined in: TIDs:any := algebra.uselect(g:bat[:oid,:oid],grpid:oid); MALException:kddart.subgroup_concat[0]:Error in cloned function TypeException:user.s2_1[15]:'kddart.subgroup_concat' undefined in: X_27:bat[:oid,:str] := kddart.subgroup_concat(X_26:bat[:oid,:str],X_16:bat[:oid,:oid],r1_16:bat[:oid,:oid],true:bit); program contains errors It says algebra.uselect function is not defined. How do I fix this problem? group_concat MAL definition start ------------------------------------------- module kddart; command group_concat(b:bat[:oid,:str]):str address KDDARTgroup_concat comment "Mal kddart"; function group_concat(b:bat[:oid, :str]):str; value := ""; barrier (h, t) := iterator.new(b); value := value + t; value := value + ""; redo (h, t) := iterator.next(b); exit (h, t); return value; end group_concat; function subgroup_concat(b:bat[:oid,:any_1],g:bat[:oid,:oid],e:bat[:oid,:any_2],skip_nils:bit) :bat[:oid,:str]; nw := aggr.count(e); nl := calc.lng(nw); bn := bat.new(:oid, :str, nl); # check 'e' has some values - this is the list of group IDs in the head # 'g' is the group to the data BAT head ID mapping # 'b' is the data column BAT that we are aggregating over barrier (grpid, t) := iterator.new(e); # select GID from TID->GID map to get matching TIDs TIDs := algebra.uselect(g,grpid); # get DATA for matching TIDs b_data := algebra.kintersect(b,TIDs); # aggregate grpval := group_concat(b_data); # Store the result for this group bat.insert(bn, grpid, grpval); redo (grpid, t) := iterator.next(e); exit (grpid, t); return bn; end subgroup_concat;

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No previous prototype for function
by Shmagi Kavtaradze 31 Mar '16

31 Mar '16

I use two versions of Monetdb. 1 is PythonUDF and another Monetdb 11.21.13. Function "bitand" is compiled and used well in Monetdb, but when I try to compile PythonUDF it gives me errors: udf.c:14:1: error: no previous prototype for 'UDFbitand' [-Werror=missing-prototypes] UDFbitand(flt *ret, lng*a, lng *b) ^ cc1: all warnings being treated as errors Makefile:876: recipe for target 'lib_udf_la-udf.lo' failed any ideas? thanks in advance.

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no sorted column?
by Roberto Cornacchia 31 Mar '16

31 Mar '16

Before filing a bug report, I'd like to ask here whether this is intentional/expected. sql>create table t(a int); operation successful (0.650ms) sql>insert into t values (1),(0),(3),(2); 4 affected rows (0.638ms) sql> sql>create table sorted_t as select a from t order by a with data; operation successful (0.807ms) sql> sql>select table,column,sorted from sys.storage() where "table"='sorted_t'; +----------+--------+--------+ | table | column | sorted | +==========+========+========+ | sorted_t | a | false | +----------+--------+--------+ I am pretty sure it use to be that the sorting used in a "CREATE TABLE AS ... WITH DATA" would result in the tsorted property to be true for the (first) sorted column. Now this isn't the case. Is that a bug or a feature? Roberto

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Possible serious Memory leak?
by Vijay Krishna 31 Mar '16

31 Mar '16

Hi, Today, we encountered this serious memory issue with MonetDB. *Data : *10 tables - each with ~600 columns - all tables are EMPTY (No rows). *Query : *One query that involves with 25 joins across all the 10 tables. *MonetDB version :* July2015-SP3 The above query is ran on the same MonetDB version with the same table structure with all tables empty on two different machines as follows. *Scenario 1 - Query ran on Macbook Pro * - RAM - 8 GB (with other processes like Chrome/Eclipse running in parallel) - Free disk space - ~100 GB - MonetDB July2015-SP3 downloaded as installable The query is ran. *Expected result* - return an empty set in a few seconds. *Actual result* - returns an empty set in ~5 minutes RAM - 8 GB utilised completely. Swap space used from disk - 10 GB This swap space is cleared after sometime automatically (around 5 mins) *Scenario 2 - With a CentOS virtual machine* - RAM - 128 GB - Free disk space - ~650 GB - MonetDB July2015-SP3 compiled from source code The query is ran. *Expected result* - return an empty set in a few seconds. *Actual result* - the query rebooted this high end CentOS machine. RAM - 128 GB utilised completely. After reboot, the swap memory was freed. I am puzzled with the following questions. 1. Why should a query that runs on 10 EMPTY tables require memory in GBs? 2. How did this query manage to run on a Mac with just 8 GB RAM, but crashed a machine with 128 GB RAM? Is this a known memory leak issue? Any help much appreciated. Thanks in advance. Regards, Vijay.

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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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