April 2007 - users-list

[MonetDB-users] saw Coolquot quotcquot
by antti proctor 21 Apr '07

21 Apr '07

About me is murmur and hum, and I know it for the gnat- swarm of the living, piping for a little space its thin plaint of troubled air. AN ALLE FINANZINVESTOREN! DIESE AKTIE WIRD DURCHSTARTEN! FREITAG 20. APRIL STARTET DIE HAUSSE! REALISIERTER KURSGEWINN VON 400%+ IN 5 TAGEN! Symbol: G7Q.F Company: COUNTY LINE ENERGY 5 Tages Kursziel: 0.95 Schlusskurs: 0.21 WKN: A0J3B0 ISIN: US2224791077 Markt: Frankfurt LASSEN SIE SICH DIESE CHANCE NICHT ENTGEHEN! G7Q WIRD WIE EINE RAKETE DURCHSTARTEN! UNSERE ERWARTUNGEN WIRD G7Q.F UBERTREFFEN! Resets the property to the default value.

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[MonetDB-users] XQuery performance and a Jdbc issue
by Tatu Lahtela 20 Apr '07

20 Apr '07

Hi, I just started investigating the usage of MonetDB with our relatively large XML document(s). It can go up to 1 million nodes in a tree type structure, like (simplified example) <item id="1" key="32"> <item id="2" key="34"/> <item id="3" key="32"> <item id="4" key="32"/> <item id="5" key="342"> <item id="6" key="32212" /> </item> </item> </item> <item id="7" key="2"> <item id="8" key="654"/> </item> </item> <item> ...... </item> ..... The key refers to a another document that contains the actual data (if all the items in the tree are unique it contains the same amount of nodes as the tree, but may be a lot less) , basically a flat list of the item data (name etc..). <data key="32"> <name>hello</name> <description>this is a test item</description> </data> <data key="342"> .... </data> The general issue is to get the tree location and key value from the tree. With a basic query like "//item[@id='33']" it takes about 3.5 seconds to get the item, and about as long to get the metadata from the other document. Using prepared queries had no effect (at least any improvement). The machine is a Intel(R) Xeon(TM) CPU 2.80GHz on Linux with 3Gb of memory. Is this level of performance expected or am I missing something essential? Another issue was when I tried to run a query through the JDBC driver. It dies with an exception (does it time out?): Exception in thread "main" java.lang.AssertionError: block 0 should have been fetched by now :( at nl.cwi.monetdb.jdbc.MonetConnection$ResultSetResponse.getLine( MonetConnection.java:1730) at nl.cwi.monetdb.jdbc.MonetResultSet.absolute(MonetResultSet.java :188) at nl.cwi.monetdb.jdbc.MonetResultSet.relative(MonetResultSet.java :2132) at nl.cwi.monetdb.jdbc.MonetResultSet.next(MonetResultSet.java:2099) at TestCache.monetDBTest(TestCache.java:99) at TestCache.main(TestCache.java:180) I tried to find an item with its description like "//data/description[contains(.,"test")]" The query runs around 5 seconds with the MapiClient. The MonetDB was downloaded and compiled yesterday (Monet Database Server V4.16.2). My XPath skills are less then admirable so all suggestions are appreciated. Cheers, -- Tatu Lahtela <lahtela(a)gmail.com>

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[MonetDB-users] Persistent Stored Modules 'OR' operator
by Colin Foss 18 Apr '07

18 Apr '07

Is the OR operator supported in a persistent stored module? e.g. --------------------- create function tmp_myfunction(a integer) returns table (val integer) begin if a < 1 or a > 100 then return table ( select val from mytable ); else return table ( select val from another_table ); end if; end; --------------------- will return the error: ERROR = !SELECT: no such binary operator 'or(int,int)'

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[MonetDB-users] ODBC
by Colin Foss 16 Apr '07

16 Apr '07

I have been trying to test ODBC with MonetDB with little success. JDBC and MapiClient are working. MS*Excel, R, and other utilities all fail while trying to initialize a connection via ODBC to MonetDB. Does anyone have a valid ODBC configuration to Monet?

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[MonetDB-users] Copy command and CHAR field.
by Todd Gruben 06 Apr '07

06 Apr '07

what are valid characters that can go into the char fields? i am trying to migrate from mysql 4.1 and my data doesn't make it in. If i strip out some the the characters it makes it. The string is Cï¿½e dIvoire. which is the ivory coast. its a pain to clense, but i just wanted to know what a valid character is.

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[MonetDB-users] SQL questions
by Colin Foss 05 Apr '07

05 Apr '07

1. How do you change a column's NULLable setting? I tried "alter table tmp_t alter column x set not null;" with no success. 2. How do you rename a table, short of "create table new_name like old_name;"? I tried "ALTER TABLE tmp_t RENAME TO tmp_t_new;" with no success.

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[MonetDB-users] Yeah recommends
by Chaim Lonsberry 03 Apr '07

03 Apr '07

Byte PC World curtain shows http://img444.imageshack.us/my.php?image=bkqu5.gif tabs shown he

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[MonetDB-users] [PF/Tijah] How to do a full text search?
by Sander Bockting 02 Apr '07

02 Apr '07

Dear all, We are trying to do a full text search in a database, but we can use some help to get started. A small excerpt from our database is stated below: //=== xquery>doc("ep") <?xml version="1.0" encoding="utf-8"?> <eprintsdata xmlns="http://eprints.org/ep2/data"> <record> <field name="eprintid">629</field> <field name="keywords">Model-based on-the-fly Testing, Timed Automata, Real-Time Testing, TorX, Tools.</field> <field name="research_projects">STRESS: Systematic Testing of Real-time Software Systems</field> </record> <record> <field name="eprintid">642</field> <field name="keywords">Compositional modelling, supervisory control</field> <field name="research_projects">HYBRIDGE: Distributed Control and Stochastic Analysis of Hybrid Systems Supporting Safety Critical Real-Time Systems Design</field> </record> </eprintsdata> //=== The PF/Tijah Getting Started page (http://dbappl.cs.utwente.nl/pftijah/Documentation/GettingStarted) mentions we can do a full text query as follows: let $c := collection("MyCollection") for $res in tijah:query($c, "//html[about(., ir db)]") return $res/head/title I believe this way is probably outdated, as tijah:query does not work. To suit our needs, I changed the query to the following form: //=== let $c := collection("ep") for $res in pf:tijah-query($c,"//field[@name='research_projects'][about(., Distributed)]") return $res //=== But this results in the following error: "ERROR = !ERROR: interpret: unknown variable 'collName'" That is why I incorporated the collection name in the query, like this: //=== for $res in pf:tijah-query(ep,"//field[@name='research_projects'][about(., Distributed)]") return $res //=== However, this also does not work, as I get the following error: "ERROR = !illegal reference to context node: at (1,29-1,30): ``.'' is unbound" I have tried numerous of other variations, but neither of them work. Can somebody please help us with an explanation about how we can do a full text search within a certain node or point us at a more recent getting started page (if it already exists)? Kind regards, Sander Bockting

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