February 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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Remote Table IS NULL
by Siklós Gábor 27 Mar '17

27 Mar '17

Hi there, We have an issue about the remote table on monetdb version of 2016 (sp1 and sp2) on Ubuntu 14.04 and on Windows Server2012 R2 The scenario for reproducing the issue with two nodes on node1 Create a table on remote node and fill it: CREATE TABLE test(id int not null, name text, valid boolean); INSERT INTO test (id, name) VALUES (1, '1'); INSERT INTO test (id, name) VALUES (2, '2'); INSERT INTO test (id) VALUES (3); on node2 CREATE REMOTE TABLE test(id int not null, name text, valid boolean) ON 'mapi:monetdb://node1:50000/dbfarm'; Then on node2: select * from test; +------+------+-------+ | id | name | valid | +======+======+=======+ | 1 | 1 | null | | 2 | 2 | null | | 3 | null | null | +------+------+-------+ It works fine, but: select * from test where name is null; +----+------+-------+ | id | name | valid | +====+======+=======+ +----+------+-------+ id 3 should appear here. Furthermore: select * from test where name is not null; (mapi:monetdb://monetdb@192.168.254.31/reports2) Cannot register project ( select ( table(sys.test) [ test.id NOT NULL, test.name, test.valid ] COUNT ) [ clob "NULL" ! <= test.name ! <= clob "NULL" ] ) [ test.id NOT NULL, test.name, test.valid ] REMOTE mapi:monetdb://.../... select * from test where valid is null; illegal input, not a JSON header (got '') and node1 is crashed (need : monetdb start farm). After downgrading on ubuntu 14.04 to version of 2015 (SP4) this scenraio works fine. Thanks, SG

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monetdb cluster
by 张馨匀 01 Mar '17

01 Mar '17

Hi all, Do you have any idea about the query throughput regarding monetdb cluster, is it slow? I created the monetdb cluster using remote table, when I do query, it's really slow, about 3sec/query. Do you know how to improve this? Or MonetDB can actually do better than this? And How? Thank you

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compilation src error with the latest version
by 张馨匀 28 Feb '17

28 Feb '17

Hi all, Do you know how to fix the src compilation error? Error is as following: *fatal error: *geos_c.h: No such file or directory #include <geos_c.h> * ^* compilation terminated. Thanks,

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Running aggregates?
by Stefan Manegold 27 Feb '17

27 Feb '17

Hi, does MonetDB support any efficient/optimized functionality to compute running aggregates? A quick check/test suggest that aggregation functions with windows functions like below does not seem to be supported, is it? ======== SELECT somedate, somevalue, SUM(somevalue) OVER(ORDER BY somedate ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningTotal FROM Table ======== Is their anything else that would provide running aggregates? Or am I (for now?) bound to calculating running aggregates using the obvious theta-self-join (expected to be "non-optimal" due to redundant work and large (huge) intermediate results), or "hijacking"/"mis-using" the bulk-version of a (to be implemented) scalar function? Thanks! Stefan -- | Stefan.Manegold(a)CWI.nl | DB Architectures (DA) | | www.CWI.nl/~manegold/ | Science Park 123 (L321) | | +31 (0)20 592-4212 | 1098 XG Amsterdam (NL) |

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MALException:opt.remap:Function 'calc.isnil' not defined
by Anthony Damico 27 Feb '17

27 Feb '17

hi, i upgraded monetdb and am hitting this error with code that previously worked. my (giant) query has lots of CAST and IS NULL commands in it.. trying to narrow it down now, but does anyone have ideas about what might've introduced this? it looks like something is calling IS NULL where it shouldn't be allowed to? thanks

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single-user / locked mode
by Roberto Cornacchia 20 Feb '17

20 Feb '17

Hi, I'm confused about the single-user mode (working with latest Dec2016 from hg). *Question/suggestion 1* 'mserver5 --single-user' can also be set with 'monetdb set singleuser=yes'. However, 'monetdb get all' doesn't show 'singleuser' as one of the options, I had to guess it myself. It would be nice if monetdb could show an actual list of available options, instead a manually compiled one. *Question 2* is 'mserver5 --single-user' expected to put the database in a locked state, equivalent to 'monetdb lock' ? If the answer is yes, then it doesn't do it consistently: - it does allow to use COPY INTO.... LOCKED (from which you would think the database is locked) but: - it doesn't show the status of the database as locked - it indeed allows new client connections Could you clarify how 'single-user' and 'locked' relate? *Question 3 *(long-ish) I am pushing, via JDBC, the entire English DBpedia via COPY INTO (without 'LOCKED'), into a dbfarm on local SSD. It is about 200GB raw data and it takes ~9 hours. Data goes through a pipeline of light pre-processing (feeding thread) and then inserted into the stream of COPY INTO (output thread). What I observe is that, at the beginning, the feeding thread is mush active, and the output thread very little. After a couple of hours, the output thread is mostly active, and the feeding thread mostly idle. I told myself that MonetDB is taking more and more time to flush appends to disk. That's where I though using 'COPY INTO .. LOCKED' would help. Not only it didn't help, but it got the symptoms worse. The output thread is almost 100% active, and the feeding thread almost 100% idle. Indeed, it is already running for 12h and still going on. Was I wrong to expect that 'LOCKED' would help? Thanks, Roberto

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