December 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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MonetDB Evaluation - Excessive slowness in a particular query
by Alfio Bettini 06 Feb '18

06 Feb '18

Hi all, we're testing MonetDB performances in order to understand if it could be possible to use it as data mart in our BI software. We're considering a set of queries executed in our test environment (CentOS 7, 32 GB RAM, 4 cpu). All the executed queries have quite good performances (between 10 and 45 seconds) except the following one that is taking several minutes in order to be executed: SELECT id, count(distinct value) FROM table GROUP BY id; The table contains 100 millions of data. It has about 130 columns (varchar, int, bigint, smallint, tinyint, timestamp, datetime). We have no BLOB/CLOB/Text types. The fields used in the query have these data types: id: int value: bigint Can you suggest us any optimizations in order to have this query run faster? Do you know some possible reasons why it's so slow? Kind Regards, Alfio Bettini The information contained in this message, together with any attachments, may be privileged and confidential and is intended for the use of the addressee(s) only. Any review, copying, use or distribution of this email by others (including any of its attachments) is strictly prohibited. If you are not the intended recipient, please destroy this email and its attachments and contact the sender immediately. This email was sent by EidosMedia SpA<http://www.eidosmedia.com>

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DEC2016-SP2 and BINARY bulk load
by Lynn Carol Johnson 11 Jan '18

11 Jan '18

Hi all – I have always used the COPY BINARY INTO … commands to load my 2.0 Billion row genetic data into a monetdb table. With 135 columns, it has been blindingly fast. Last week I moved from the June2016-SP2 release to dec2016-SP2. My binary loads are taking WAY longer. I killed one after 3 hours (via “call sys.stop(pid)” so it could clean up properly). I then started the load again, thinking perhaps the problem was related to the new columns I was adding. I have since dropped the table and remade it using the same data and scripts that worked in just over 3 minutes in February on the jun2016-SP2 load. It is really chugging along – I’m up to 30 minutes and counting. I don’t have access to the sql log files, but the Merovingian.log shows nothing. I do notice that previously the binary files, once loaded, were removed from the loading directly. This does not happen now. Were these files previously “moved” and now they are copied? Has anyone see this performance issue with Dec2016-SP2 COPY BINARY INTO …. Commands? Thanks - Lynn

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SyntaxException:parseError:Xclose
by Dennis Fassl 06 Jan '18

06 Jan '18

Hi all, I am generating MAL queries in Java and I am using the JDBC interface to execute them. This works fine for small tables. But if the resultSet has more than 100 entries MonetDB is printing the first 100 rows and then gives me the following error: ... [ 19, "undergraduateDegreeFrom", 1509 ] [ 19, "memberOf", 613 ] [ 19, "takesCourse", 556 ] [ 19, "advisor", 600 ] [ 20, "undergraduateDegreeFrom", 1493 ] [ 20, "memberOf", 613 ] [ 20, "takesCourse", 529 ] [ 20, "takesCourse", 578 ] [ 20, "takesCourse", 557 ] [ 20, "advisor", 1315 ] MAPI = (monetdb) /tmp/.s.monetdb.50000 QUERY = sql.resultSet(table_names, table_attrs, table_type, table_lens, table_scales, start_id, type, end_id); ERROR = !SyntaxException:parseError:Xclose 0 !SyntaxException:parseError: ^';' expected Could you help me to avoid this error? This is the full query: sql.init(); tbd := sql.mvc(); start_id:bat[:int] := sql.bind(tbd,"sys","relations","start_id",0:int); type:bat[:str] := sql.bind(tbd,"sys","relations","type",0:int); end_id:bat[:int] := sql.bind(tbd,"sys","relations","end_id",0:int); table_names := bat.new(nil:str); table_names := bat.append(table_names, "start_id"); table_names := bat.append(table_names, "type"); table_names := bat.append(table_names, "end_id"); table_attrs := bat.new(nil:str); table_attrs := bat.append(table_attrs, "str"); table_attrs := bat.append(table_attrs, "str"); table_attrs := bat.append(table_attrs, "str"); table_type := bat.new(:str); table_type := bat.append(table_type, "int"); table_type := bat.append(table_type, "varchar"); table_type := bat.append(table_type, "int"); table_lens := bat.new(nil:int); table_lens := bat.append(table_lens, 1); table_lens := bat.append(table_lens, 1); table_lens := bat.append(table_lens, 1); table_scales := bat.new(nil:int); table_scales := bat.append(table_scales, 0); table_scales := bat.append(table_scales, 0); table_scales := bat.append(table_scales, 0); sql.resultSet(table_names, table_attrs, table_type, table_lens, table_scales, start_id, type, end_id); I am using "MonetDB Database Server v1.7 (Dec2016-SP5)" on Ubuntu 14.04. What am I trying to do: The goal of the project is to use Cypher as an input language for MonetDB. I have a Cypher optimizer written in Java. The output of this optimizer should be used as input for MonetDB. In the end we want to compare the the runtime of a query in MonetDB and in Neo4J. Thanks and regards, Dennis

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MonetDB header Datatype Question
by Sharma, Sreejith 31 Dec '17

31 Dec '17

All, I would like to know what is the MonetDB header datatype if no alias or column name provided? In my BI application, am getting an error while using SELECT SUM(DISTINCT COLUMN_NAME) FROM TABLE_NAME. I see it works in 11.27.9 build when installed in CentOS. However, when i download the source tarball and recompile the code, this fox seems to be lost. Is there anywhere this can be identified? Or fixed? Regards, Sreejith

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Monetdb date column issue
by Amit Ambekar 27 Dec '17

27 Dec '17

Hi, i am using MonetDB v11.23.7 (Jun2016-SP1) version. in that when is reboot my ubuntu machine, my date columns in all tables becoming null . is there any issue related to version? Warm Regards, *Amit Suryakant Ambekar*** */Technology Associate/* Office: Ist floor, Poddar Chambers, Mathruradas Mill Compound, Lower Parel, Mumbai 400013 | Landline: +91 22 43470408 Cell: +91 7741823310 | Email: amit(a)g-square.in | Website:www.g-square.in

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SELECT: too many nested operators
by Sharma, Sreejith 19 Dec '17

19 Dec '17

All, I have a valid scenario where our application generates a SQL which is around 4.4MB and contains 75K of combination of AND and OR operators. This SQL fails with "SELECT: too many nested operators" error while executing this SQL. While I went through the code, I noticed any thread size above THREAD_STACK_SIZE - 16 * 1024 is getting aborted. Is there any possibility that we can change this? Any reason why it's set to 16MB? As server our server has enough memory and storage and we need to understand if this can be handled in code or via parameter as this is valid scenario. Also, we can't split the SQL too. Regards, Sreejith

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