September 2005 - users-list

[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] RHEL 3 RPMs
by Henk van Lingen 28 Apr '06

28 Apr '06

Hi, Is there a special reason there are no i686 RPM's anymore like there were until 4.6.0_rc2? I think it's a bit weird there are RPM's for the hobby OS 'FedoraCore' but not for the much used server OS 'RedHat Enterprise 3 (and 4)'? The FedoraCore (which Core?) needs libstdc++.so.6 whereas RHEL 3 only has libstdc++.so.5 ... There also seems to be no SRPM's. Cheers, -- Henk van Lingen, Systems & Network Administrator (o- -+ Dept. of Computer Science, Utrecht University. /\ | phone: +31-30-2535278 v_/_ http://henk.vanlingen.net/ http://www.tuxtown.net/netiquette/

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[MonetDB-users] Bulk load
by Andrei Martsinchyk 03 Oct '05

03 Oct '05

Hello, I am trying to pipe output from my application using bulk load. If application produced output like this: CREATE TABLE test (col1 int); COPY 3 RECORDS INTO "test" FROM stdin USING DELIMITERS '\t'; 1 2 NULL COMMIT; I could pipe it to MapiClient -lsql -umonetdb -Pmonetdb, it worked OK. But application does not know how many rows it will produce, until dump out all the records. When I tried to skip record count I got failed assertion error (a bug ?). Anyway, it would fail when encountered COMMIT; at the end. At the same time COPY without record count can load data from a file, but I do not want to put data into temp table and then do load because i want them run in parallel. Could you suggest a way to do the loading ? -- Best regards, Andrei Martsinchyk mailto:andrei.martsinchyk@gmail.com

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[MonetDB-users] SQL: Update table from another table
by Andrei Martsinchyk 08 Sep '05

08 Sep '05

Hello All, Does SQL frontent support updating one table with data from another table ? More formally, if I have two tables create table t1 (id1 int, val1 varchar(255)); and create table t2 (id2 int, val2 varchar(255)); , can I execute statement like this (PostgreSQL syntax): update t1 set val1=val2 from t2 where id1=id2; ? Thanks in advance. -- Best regards, Andrei Martsinchyk mailto:andrei.martsinchyk@gmail.com

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[MonetDB-users] "Large" document collection and MonetDB/XQuery
by Bastiaan Naber 05 Sep '05

05 Sep '05

We have been experimenting with the MonetDB/XQuery at our institure and we have some issues. We have loaded 727 XML documents into MonetDB with the shred_doc() command: shred_doc("{xml file 1}, "1") shred_doc("{xml file 2}, "2") etc... These files are small (4 a 5 kilobytes). When we query these files with the following query the result takes a long time to complete (2 minutes): for $i in ("0", "1", .... "727") return $i Can anyone explain why looping over 727 documents is so slow? We have collected all 727 XML documents into 1 XML file and loaded this in MonetDB and this is a lot faster. The test machine is a 2.8 GHz P4 with 1 GB of memory. Another isue is related to the size of the database on the harddisk. When we fist load the 727 XML documents into the database the database directory contains about 47.000 files and is 50 megabytes in size. When we have excuted a number of querys the size of this directory increases to 1.7 gigabytes!! Can anyone explain this behaviour? Is MonetDB generating somekind of dynamic indices? Thanks for your replys, Bastiaan Naber

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