October 2010 - users-list

[MonetDB-users] Proofreading your professional documents
by Richard Hounslow 24 Feb '24

24 Feb '24

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Re: [MonetDB-users] Querying date type column in MonetDB
by Stefan Manegold 23 Nov '10

23 Nov '10

I see --- if you consider it a bug, please file a detailed bug report including information & instructions to reporduce the problem as well as infornmation about the exact MonetDB version and OS you're using via http://bugs.MonetDB.org/ Stefan ----- Oorspronkelijk bericht ----- Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> Verzonden: maandag 25 oktober 2010 16:32 Aan: Communication channel for MonetDB users <monetdb-users(a)lists.sourceforge.net> Onderwerp: Re: [MonetDB-users] Querying date type column in MonetDB Hi Stefan, Nope, the name of the column is "deliveryDays" :) Freddy 2010/10/25 Stefan Manegold <Stefan.Manegold(a)cwi.nl> > Hi Freddy, > > I don't think that the error you experience is triggered by the column > type, but rather by the fact that your date column ha? a name - say "date" - > that is a reserved key word in SQL an hence needs to be double-quoted > according to the SQL standard (this is not a MonetDB specific choice, but a > "feature" of the SQL standard) --- not knowing your table & column names, I > can only guess, though ... > > Stefan > > > ----- Oorspronkelijk bericht ----- > Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> > Verzonden: maandag 25 oktober 2010 16:03 > Aan: MonetDB-users <monetdb-users(a)lists.sourceforge.net> > Onderwerp: [MonetDB-users] Querying date type column in MonetDB > > Dear All, > > I am new to MonetDB, so most likely my question will look obvious. > > I would like to ask, how can columns with date type is queried in monetdb. > Based on my experience, it seems that date type columns need special > treatment. It seems that the only way to query them is with the syntax > "column_name" while other columns seems to work with the format > table_name.column_name without the need of double quote. When I tried to > query date column with the syntax table_name.column_name, it gave me an > error "no such column" > > So my question is, is it true that the only way to query date columns is > using "column_name" format? Another question will be, what happen if I need > to query same name columns coming from different table? > > Thanks in advance, > Freddy > > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America > contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > MonetDB-users mailing list > MonetDB-users(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/monetdb-users >

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Re: [MonetDB-users] Querying date type column in MonetDB
by Stefan Manegold 25 Oct '10

25 Oct '10

"T.c" != "T"."c" ;-) -- | Stefan.Manegold @ CWI .nl | DB Architectures (INS1) | | http://www.cwi.nl/~manegold/ | Science Park 123 (L321) | | Tel.: +31 (0)20 592-4212 | 1098 XG Amsterdam (NL) | ----- Oorspronkelijk bericht ----- Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> Verzonden: maandag 25 oktober 2010 17:11 Aan: Communication channel for MonetDB users <monetdb-users(a)lists.sourceforge.net> Onderwerp: Re: [MonetDB-users] Querying date type column in MonetDB Dear Arjen, Thanks. I did check the uppercase letter. With a date-type column "deliveryDays" in a table "bsbm.offer", here is the result - SELECT "deliveryDays" FROM bsbm.offer --> WORKS - SELECT "deliverydays" FROM bsbm.offer --> FAILS - SELECT "offer.deliveryDays" FROM bsbm.offer --> FAILS - SELECT deliveryDays FROM bsbm.offer --> FAILS - SELECT offer.deliveryDays FROM bsbm.offer --> FAILS - SELECT offer."deliveryDays" FROM bsbm.offer ---> WORKS The last query is the one I need :) Again, thanks for the help. Regards Freddy 2010/10/25 Arjen de Rijke <Arjen.de.Rijke(a)cwi.nl> > Stefan Manegold <Stefan.Manegold(a)cwi.nl> writes: > > > I see --- if you consider it a bug, please file a detailed bug report > including information & instructions to reporduce the problem as well as > infornmation about the exact MonetDB version and OS you're using via > http://bugs.MonetDB.org/ > > I would not consider it a bug. The catch is the uppercase letter in > deliveryDays. The default handling of upper/lowercase characters is > different than in other RDMBS. So in some cases the quotes are necessary. > > Arjen de Rijke > > > > Stefan > > > > > > ----- Oorspronkelijk bericht ----- > > Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> > > Verzonden: maandag 25 oktober 2010 16:32 > > Aan: Communication channel for MonetDB users < > monetdb-users(a)lists.sourceforge.net> > > Onderwerp: Re: [MonetDB-users] Querying date type column in MonetDB > > > > Hi Stefan, > > > > Nope, the name of the column is "deliveryDays" :) > > > > Freddy > > > > 2010/10/25 Stefan Manegold <Stefan.Manegold(a)cwi.nl> > > > >> Hi Freddy, > >> > >> I don't think that the error you experience is triggered by the column > >> type, but rather by the fact that your date column ha? a name - say > "date" - > >> that is a reserved key word in SQL an hence needs to be double-quoted > >> according to the SQL standard (this is not a MonetDB specific choice, > but a > >> "feature" of the SQL standard) --- not knowing your table & column > names, I > >> can only guess, though ... > >> > >> Stefan > >> > >> > >> ----- Oorspronkelijk bericht ----- > >> Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> > >> Verzonden: maandag 25 oktober 2010 16:03 > >> Aan: MonetDB-users <monetdb-users(a)lists.sourceforge.net> > >> Onderwerp: [MonetDB-users] Querying date type column in MonetDB > >> > >> Dear All, > >> > >> I am new to MonetDB, so most likely my question will look obvious. > >> > >> I would like to ask, how can columns with date type is queried in > monetdb. > >> Based on my experience, it seems that date type columns need special > >> treatment. It seems that the only way to query them is with the syntax > >> "column_name" while other columns seems to work with the format > >> table_name.column_name without the need of double quote. When I tried to > >> query date column with the syntax table_name.column_name, it gave me an > >> error "no such column" > >> > >> So my question is, is it true that the only way to query date columns is > >> using "column_name" format? Another question will be, what happen if I > need > >> to query same name columns coming from different table? > >> > >> Thanks in advance, > >> Freddy > >> > >> > >> > ------------------------------------------------------------------------------ > >> Nokia and AT&T present the 2010 Calling All Innovators-North America > >> contest > >> Create new apps & games for the Nokia N8 for consumers in U.S. and > Canada > >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > >> marketing > >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > >> http://p.sf.net/sfu/nokia-dev2dev > >> _______________________________________________ > >> MonetDB-users mailing list > >> MonetDB-users(a)lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/monetdb-users > >> > > > > > ------------------------------------------------------------------------------ > > Nokia and AT&T present the 2010 Calling All Innovators-North America > contest > > Create new apps & games for the Nokia N8 for consumers in U.S. and > Canada > > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > marketing > > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > > http://p.sf.net/sfu/nokia-dev2dev > > _______________________________________________ > > MonetDB-users mailing list > > MonetDB-users(a)lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/monetdb-users > > -- > ==================================================================== > CWI, Kamer L330 Centrum voor Wiskunde en Informatica > Science Park 123 Email: arjen.de.rijke(a)cwi.nl > 1098 XG Amsterdam tel: +31-(0)20-5924305 > Nederland +31-(0)6-51899284 > fax: +31-(0)20-5924312 > ===================== http://www.cwi.nl/~rijke/ ==================== > > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America > contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > MonetDB-users mailing list > MonetDB-users(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/monetdb-users >

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Re: [MonetDB-users] Querying date type column in MonetDB
by Stefan Manegold 25 Oct '10

25 Oct '10

Good point, Arjen! Indeed CaMeL case identifiers need to be double-quoted in MonetDB/SQL ... Stefan -- | Stefan.Manegold @ CWI .nl | DB Architectures (INS1) | | http://www.cwi.nl/~manegold/ | Science Park 123 (L321) | | Tel.: +31 (0)20 592-4212 | 1098 XG Amsterdam (NL) | ----- Oorspronkelijk bericht ----- Van: Arjen de Rijke <Arjen.de.Rijke(a)cwi.nl> Verzonden: maandag 25 oktober 2010 17:00 Aan: Communication channel for MonetDB users <monetdb-users(a)lists.sourceforge.net> Onderwerp: Re: [MonetDB-users] Querying date type column in MonetDB Stefan Manegold <Stefan.Manegold(a)cwi.nl> writes: > I see --- if you consider it a bug, please file a detailed bug report including information & instructions to reporduce the problem as well as infornmation about the exact MonetDB version and OS you're using via http://bugs.MonetDB.org/ I would not consider it a bug. The catch is the uppercase letter in deliveryDays. The default handling of upper/lowercase characters is different than in other RDMBS. So in some cases the quotes are necessary. Arjen de Rijke > > Stefan > > > ----- Oorspronkelijk bericht ----- > Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> > Verzonden: maandag 25 oktober 2010 16:32 > Aan: Communication channel for MonetDB users <monetdb-users(a)lists.sourceforge.net> > Onderwerp: Re: [MonetDB-users] Querying date type column in MonetDB > > Hi Stefan, > > Nope, the name of the column is "deliveryDays" :) > > Freddy > > 2010/10/25 Stefan Manegold <Stefan.Manegold(a)cwi.nl> > >> Hi Freddy, >> >> I don't think that the error you experience is triggered by the column >> type, but rather by the fact that your date column ha? a name - say "date" - >> that is a reserved key word in SQL an hence needs to be double-quoted >> according to the SQL standard (this is not a MonetDB specific choice, but a >> "feature" of the SQL standard) --- not knowing your table & column names, I >> can only guess, though ... >> >> Stefan >> >> >> ----- Oorspronkelijk bericht ----- >> Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> >> Verzonden: maandag 25 oktober 2010 16:03 >> Aan: MonetDB-users <monetdb-users(a)lists.sourceforge.net> >> Onderwerp: [MonetDB-users] Querying date type column in MonetDB >> >> Dear All, >> >> I am new to MonetDB, so most likely my question will look obvious. >> >> I would like to ask, how can columns with date type is queried in monetdb. >> Based on my experience, it seems that date type columns need special >> treatment. It seems that the only way to query them is with the syntax >> "column_name" while other columns seems to work with the format >> table_name.column_name without the need of double quote. When I tried to >> query date column with the syntax table_name.column_name, it gave me an >> error "no such column" >> >> So my question is, is it true that the only way to query date columns is >> using "column_name" format? Another question will be, what happen if I need >> to query same name columns coming from different table? >> >> Thanks in advance, >> Freddy >> >> >> ------------------------------------------------------------------------------ >> Nokia and AT&T present the 2010 Calling All Innovators-North America >> contest >> Create new apps & games for the Nokia N8 for consumers in U.S. and Canada >> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in >> marketing >> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store >> http://p.sf.net/sfu/nokia-dev2dev >> _______________________________________________ >> MonetDB-users mailing list >> MonetDB-users(a)lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/monetdb-users >> > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > MonetDB-users mailing list > MonetDB-users(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/monetdb-users -- ==================================================================== CWI, Kamer L330 Centrum voor Wiskunde en Informatica Science Park 123 Email: arjen.de.rijke(a)cwi.nl 1098 XG Amsterdam tel: +31-(0)20-5924305 Nederland +31-(0)6-51899284 fax: +31-(0)20-5924312 ===================== http://www.cwi.nl/~rijke/ ==================== ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ MonetDB-users mailing list MonetDB-users(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/monetdb-users

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Re: [MonetDB-users] Querying date type column in MonetDB
by Stefan Manegold 25 Oct '10

25 Oct '10

Hi Freddy, I don't think that the error you experience is triggered by the column type, but rather by the fact that your date column ha? a name - say "date" - that is a reserved key word in SQL an hence needs to be double-quoted according to the SQL standard (this is not a MonetDB specific choice, but a "feature" of the SQL standard) --- not knowing your table & column names, I can only guess, though ... Stefan ----- Oorspronkelijk bericht ----- Van: Freddy Priyatna <freddy.priyatna(a)gmail.com> Verzonden: maandag 25 oktober 2010 16:03 Aan: MonetDB-users <monetdb-users(a)lists.sourceforge.net> Onderwerp: [MonetDB-users] Querying date type column in MonetDB Dear All, I am new to MonetDB, so most likely my question will look obvious. I would like to ask, how can columns with date type is queried in monetdb. Based on my experience, it seems that date type columns need special treatment. It seems that the only way to query them is with the syntax "column_name" while other columns seems to work with the format table_name.column_name without the need of double quote. When I tried to query date column with the syntax table_name.column_name, it gave me an error "no such column" So my question is, is it true that the only way to query date columns is using "column_name" format? Another question will be, what happen if I need to query same name columns coming from different table? Thanks in advance, Freddy

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[MonetDB-users] Querying date type column in MonetDB
by Freddy Priyatna 25 Oct '10

25 Oct '10

Dear All, I am new to MonetDB, so most likely my question will look obvious. I would like to ask, how can columns with date type is queried in monetdb. Based on my experience, it seems that date type columns need special treatment. It seems that the only way to query them is with the syntax "column_name" while other columns seems to work with the format table_name.column_name without the need of double quote. When I tried to query date column with the syntax table_name.column_name, it gave me an error "no such column" So my question is, is it true that the only way to query date columns is using "column_name" format? Another question will be, what happen if I need to query same name columns coming from different table? Thanks in advance, Freddy

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[MonetDB-users] calc.date in SQL to MAL.
by Guillaume Yziquel 22 Oct '10

22 Oct '10

Hi. I have resumed work on the OCaml binding for MonetDB. I have been playing a bit with it and with MonetDB, and noticed something rather weird when trying to explain a SQL statement to MAL. Compilation, and launching a small test in an OCaml toplevel: yziquel@seldon:~/data$ make ocamlbuild -use-ocamlfind import.cma Finished, 3 targets (0 cached) in 00:00:00. yziquel@seldon:~/data$ make test cp ocamlinit _build/ cd _build; ledit ocaml -init ocamlinit Objective Caml version 3.12.0 Findlib has been successfully loaded. Additional directives: #require "package";; to load a package #list;; to list the available packages #camlp4o;; to load camlp4 (standard syntax) #camlp4r;; to load camlp4 (revised syntax) #predicates "p,q,...";; to set these predicates Topfind.reset();; to force that packages will be reloaded #thread;; to enable threads /usr/lib/ocaml/csv: added to search path /usr/lib/ocaml/csv/csv.cma: loaded /usr/lib/ocaml/unix.cma: loaded /usr/lib/ocaml/monetdb5: added to search path /usr/lib/ocaml/monetdb5/monetDB5.cma: loaded /usr/lib/ocaml/dynlink.cma: loaded /usr/lib/ocaml/camlp4: added to search path /usr/lib/ocaml/pcre: added to search path /usr/lib/ocaml/pcre/pcre.cma: loaded /usr/local/lib/ocaml/3.12.0/tophide: added to search path /usr/local/lib/ocaml/3.12.0/tophide/tophide.cmo: loaded /usr/local/lib/ocaml/3.12.0/mikmatch_pcre: added to search path /usr/local/lib/ocaml/3.12.0/mikmatch_pcre/run_mikmatch_pcre.cma: loaded So much for the prologue, and dynamic loading. So the test starts here. Everytime you see "Asking", it is the statement that is fed to the connection handler in order to retrieve the query handler. (With mapilib). Asking: select name from tables; Asking: create table indu (Date date, Open decimal(15,2), High decimal(15,2), Low decimal(15,2), Close decimal(15,2), Volume decimal(15,2), OI decimal(15,2)); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-02-01', 108.80, 108.80, 108.80, 108.80, 1156, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-05-01', 108.90, 108.90, 108.90, 108.90, 1305, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-06-01', 107.40, 107.40, 107.40, 107.40, 1251, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-07-01', 107.60, 107.60, 107.60, 107.60, 771, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-08-01', 107.20, 107.20, 107.20, 107.20, 843, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-09-01', 106.60, 106.60, 106.60, 106.60, 736, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-12-01', 104.20, 104.20, 104.20, 104.20, 1049, 0); Asking: insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-13-01', 104.50, 104.50, 104.50, 104.50, 908, 0); And on this last statement, the server doesn't seem happy at all: Exception: MonetDB5.Mapi.Error (Some (MonetDB5.Mapi.MSERVER, None)). So I've been trying to 'explain' the SQL to MAL. The first two work fine and output a very similar MAL statement. The third SQL statements, however, is getting translated to something somewhat different: You see a call to 'calc.date' on the 4th MAL line: # ask "explain insert into indu (Date, Open, High, Low, Close, Volume, # OI) values ('1920-07-01', 107.60, 107.60, 107.60, 107.60, 771, 0);";; Asking: explain insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-07-01', 107.60, 107.60, 107.60, 107.60, 771, 0); - : string option list list = [[Some "function user.s0_1{autoCommit=true}():void;"]; [Some " _2 := sql.mvc();"]; [Some "barrier _32 := language.dataflow();"]; [Some " _3 := sql.append(_2,\"sys\",\"indu\",\"date\",1920-07-01);"]; [Some " _7 := sql.append(_3,\"sys\",\"indu\",\"open\",10760:lng);"]; [Some " _9 := sql.append(_7,\"sys\",\"indu\",\"high\",10760:lng);"]; [Some " _11 := sql.append(_9,\"sys\",\"indu\",\"low\",10760:lng);"]; [Some " _13 := sql.append(_11,\"sys\",\"indu\",\"close\",10760:lng);"]; [Some " _15 := sql.append(_13,\"sys\",\"indu\",\"volume\",77100:lng);"]; [Some " sql.append(_15,\"sys\",\"indu\",\"oi\",0:lng);"]; [Some "exit _32;"]; [Some " sql.affectedRows(1:wrd,\"\");"]; [Some "end s0_1;"]] # ask "explain insert into indu (Date, Open, High, Low, Close, Volume, # OI) values ('1920-12-01', 104.20, 104.20, 104.20, 104.20, 1049, 0);";; Asking: explain insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-12-01', 104.20, 104.20, 104.20, 104.20, 1049, 0); - : string option list list = [[Some "function user.s1_1{autoCommit=true}():void;"]; [Some " _2 := sql.mvc();"]; [Some "barrier _32 := language.dataflow();"]; [Some " _3 := sql.append(_2,\"sys\",\"indu\",\"date\",1920-12-01);"]; [Some " _7 := sql.append(_3,\"sys\",\"indu\",\"open\",10420:lng);"]; [Some " _9 := sql.append(_7,\"sys\",\"indu\",\"high\",10420:lng);"]; [Some " _11 := sql.append(_9,\"sys\",\"indu\",\"low\",10420:lng);"]; [Some " _13 := sql.append(_11,\"sys\",\"indu\",\"close\",10420:lng);"]; [Some " _15 := sql.append(_13,\"sys\",\"indu\",\"volume\",104900:lng);"]; [Some " sql.append(_15,\"sys\",\"indu\",\"oi\",0:lng);"]; [Some "exit _32;"]; [Some " sql.affectedRows(1:wrd,\"\");"]; [Some "end s1_1;"]] # ask "explain insert into indu (Date, Open, High, Low, Close, Volume, # OI) values ('1920-13-01', 104.50, 104.50, 104.50, 104.50, 908, 0);";; Asking: explain insert into indu (Date, Open, High, Low, Close, Volume, OI) values ('1920-13-01', 104.50, 104.50, 104.50, 104.50, 908, 0); - : string option list list = [[Some "function user.s2_1{autoCommit=true}():void;"]; [Some " _2 := sql.mvc();"]; [Some "barrier _33 := language.dataflow();"]; [Some " _3 := calc.date(\"1920-13-01\");"]; [Some " _4 := sql.append(_2,\"sys\",\"indu\",\"date\",_3);"]; [Some " _8 := sql.append(_4,\"sys\",\"indu\",\"open\",10450:lng);"]; [Some " _10 := sql.append(_8,\"sys\",\"indu\",\"high\",10450:lng);"]; [Some " _12 := sql.append(_10,\"sys\",\"indu\",\"low\",10450:lng);"]; [Some " _14 := sql.append(_12,\"sys\",\"indu\",\"close\",10450:lng);"]; [Some " _16 := sql.append(_14,\"sys\",\"indu\",\"volume\",90800:lng);"]; [Some " sql.append(_16,\"sys\",\"indu\",\"oi\",0:lng);"]; [Some "exit _33;"]; [Some " sql.affectedRows(1:wrd,\"\");"]; [Some "end s2_1;"]] # Why is that happening? The SQL statements seem so similar that I do not see why it gets compiled differently to MAL. Best regards, -- Guillaume Yziquel http://yziquel.homelinux.org

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[MonetDB-users] installation corrupted
by Nafees Ur Rehman 20 Oct '10

20 Oct '10

Hi, I am using monetDB/SQL for windows on an xp machine. Two days ago, the server stopped responding. Tried to repair and change it...but didn't work. Also got it formally un-installed and then tried re-installation...but no luck. Any hints. The server does not mount at all. Regards Nafees Ur Rehman Konstanz, Germany

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[MonetDB-users] MonetDB performance question
by Tudor-Ioan Salomie 18 Oct '10

18 Oct '10

Hi, I have recently tried doing some experiments with MonetDB, measuring its performance for the following dataset+workload: * 1 table (50 attributes), 1GB, comprising 3.000.000 tuples * the attributes are fixed length strings and integer types * the workload is query (SELECT) only, where each query has the form: SELECT <list_of_projections> FROM MyTable WHERE <list_of_predicates>; * the list of predicates is a conjunction of equality operators * more than 99% of the queries predicate on the same attribute (let's call it A1) that has a *very* good selectivity * the average number of predicated attributes per query is 8 * for this workload, averaging over 4000 queries, there is 1 result tuple per query (actual result tuples per query are in the range 0-10) I have installed MonetDB on a 64-bit Debian machines, using the .deb files provided on the internet: * libmonetdb1_1.38.5-20100824_amd64.deb * libmonetdb5-server5_5.20.5-20100824_amd64.deb * libmonetdb5-sql2_2.38.5-20100824_amd64.deb * libmonetdb-client1_1.38.5-20100824_amd64.deb * monetdb5-server_5.20.5-20100824_amd64.deb * monetdb5-sql_2.38.5-20100824_amd64.deb * monetdb-client_1.38.5-20100824_amd64.deb For running the queries I use the SQL front end. I have run the queries both through "mclient" (directly on the server) and through the JDBC driver (from another client machine). The MonetDB server is bound to run on only one core on the machine (though I have not seen any difference if running it on multiple cores). To my surprise, the throughput for MonetDB for this workload is very low. I get about 3 queries per second, which seems to indicate that MonetDB does full table scanning only. Am I correct in this assumption? Is there anything that can be done to speed it up? Is this not a workload suitable for MonetDB? Looking forward to your input! Regards, Tudor.

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[MonetDB-users] FW: Comment via CWI webform MonetDB
by Peter Boncz 15 Oct '10

15 Oct '10

Narayan Sujay, Thanks for your interest in MonetDB. Rather than directing technical questions to the CWI organization webmaster, you are supposed to post on one of the relevant mailing lists such as this one (monetdb-user(a)lists.sourceforge.net). Peter -----Original Message----- From: Minnie Middelberg [mailto:Minnie.Middelberg@cwi.nl] Sent: Friday, October 15, 2010 9:50 AM To: Peter Boncz Subject: Fwd: Comment via CWI webform MonetDB Hallo Peter, Onderstaand is binnengekomen via het CWI Comment formulier en het betreft MonetDB. Wetende dat jij en Marting Kersten achter MonetDB zitten forward ik het maar naar jou. Mocht er iemand zijn die dit soort vragen belast is dan hoor ik het graag van je. Mvg Minnie ----- Forwarded Message ----- From: "Narayan Sujay" <316sujay(a)gmail.com> To: voorlichting(a)cwi.nl, webmaster(a)cwi.nl Sent: Thursday, 14 October, 2010 6:15:15 PM Subject: Comment via CWI webform Submitted on 14.10.2010 - 18:15 Submitted by anonymous user: [198.134.51.12] Submitted values are: Name sender: Narayan Sujay Email address: 316sujay(a)gmail.com Telephone number: 4193780532 Your comment: Hello, I have downloaded MonetDB and the native client and server work well. I can write simple queries in the client cmd window. I am trying to connect MonetDB with one of the SQL frontends like DB visualizer etc and I am not able to do this. Please help me out with instructions. I followed the instructions on the webpage but still getting errors connecting through db visualizer. I think it is the problem with the JDBC drivers. Please let me know excatly where to find the driver on the local computer after I have installed Monet DB. My Main goal here is to load large Data sets in MonetDB. Please tell me a way to do this for Monet DB. The error I get in DB Visualizer is: Long Message: Cannot connect to ORB Details: Type: javax.naming.CommunicationException Stack Trace: javax.naming.CommunicationException: Cannot connect to ORB [Root exception is org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No] at com.sun.jndi.cosnaming.CNCtx.setOrbAndRootContext(Unknown Source) at com.sun.jndi.cosnaming.CNCtx.initOrbAndRootContext(Unknown Source) at com.sun.jndi.cosnaming.CNCtx.<init>(Unknown Source) at com.sun.jndi.cosnaming.CNCtxFactory.getInitialContext(Unknown Source) at javax.naming.spi.NamingManager.getInitialContext(Unknown Source) at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source) at javax.naming.InitialContext.init(Unknown Source) at javax.naming.InitialContext.<init>(Unknown Source) at com.onseven.dbvis.db.A.G.Ą(Z:3155) at com.onseven.dbvis.db.A.G.Ĭ(Z:2675) at com.onseven.dbvis.db.A.E.Ĭ(Z:98) at com.onseven.dbvis.db.A.D.ā(Z:2056) at se.pureit.swing.A.O$2.run(Z:1192) at java.lang.Thread.run(Unknown Source) Caused by: org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(Unknown Source) at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(Unknown Source) at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(Unknown Source) at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(Unknown Source) at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.createConnection(Unknown Source) at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(Unknown Source) at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(Unknown Source) at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.invoke(Unknown Source) at com.sun.corba.se.impl.resolver.BootstrapResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.resolver.CompositeResolverImpl.resolve(Unknown Source) at com.sun.corba.se.impl.orb.ORBImpl.resolve_initial_references(Unknown Source) ... 14 more Caused by: java.net.ConnectException: Connection refused: connect at sun.nio.ch.Net.connect(Native Method) at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) at java.nio.channels.SocketChannel.open(Unknown Source) at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket(Unknown Source) ... 25 more The results of this submission may be viewed at: http://www.cwi.nl/en/node/757/submission/3152

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